CAPRYLIC-CAPRIC ACID

WHAT IS CAPRYLIC-CAPRIC ACID?

Caprylic-Capric Acid, known as Kaprilik-Kaprik Asit, Kaprilik Kaprik Asit, or C8-C10 Yağ Asidi in Turkish, is a fractionated binary mixture of two linear saturated monocarboxylic medium-chain fatty acids: eight-carbon caprylic acid (octanoic acid, C8H16O2, CAS No. 124-07-2) and ten-carbon capric acid (decanoic acid, C10H20O2, CAS No. 334-48-5). In global chemical inventories and REACH registrations, this defined binary oleochemical cut is identified under CAS No. 68937-75-7 and EC / EINECS No. 273-086-2 (Fatty acids, C8-10).

Natural lauric vegetable oils—specifically coconut oil (Cocos nucifera) and palm kernel oil (Elaeis guineensis)—contain caprylic acid (C8:0) and capric acid (C10:0) in a natural weight ratio of approximately 55:45 to 60:40 (C8:C10). When crude split coconut or palm kernel fatty acids are refined by vacuum fractional distillation, the volatile C6 caproic acid fore-run is removed overhead first, and the combined C8–C10 fraction is then co-distilled overhead as Caprylic-Capric Acid, separating it cleanly from the heavier C12–C18 lauric, myristic, palmitic, stearic, and oleic acids.

Producing and using Caprylic-Capric Acid as a co-distilled C8–C10 blend provides two practical advantages over single-cut C8 or C10 fatty acids: first, it eliminates the energy-intensive C8/C10 splitter distillation column whenever the target derivative (such as standard C8/C10 MCT oil, coco-caprylate/caprate, or mixed polyol esters) requires both chain lengths; second, binary mixing of C8 and C10 chains induces eutectic freezing-point depression, lowering the solidification point to 0 to 10 degrees Celsius compared to ~16.5 degrees Celsius for pure Caprylic Acid and ~31.5 degrees Celsius for pure Capric Acid.
Buyers must strictly distinguish Caprylic-Capric Acid (the free, acidic carboxylic acid mixture, CAS 68937-75-7, Acid Value ~354–370 mg KOH/g) from Caprylic/Capric Triglyceride (MCT Oil, CAS 73398-61-5 or 65381-09-1, Acid Value <= 0.2 mg KOH/g). Caprylic-Capric Acid is a corrosive organic acid feedstock used in esterification reactors to manufacture neutral Caprylic/Capric Triglyceride, and must never be confused with or substituted for neutral MCT oil in consumer applications.

Common Product and Chemical Names:
Caprylic-Capric Acid
Caprylic/Capric Acid
Caprylic Capric Acid
Fatty Acids, C8-10
C8-10 Fatty Acid
C8-C10 Fatty Acid
C810 Fatty Acid
Octanoic-Decanoic Acid
Octanoic/Decanoic Acid Blend
Reaction Mass of Octanoic Acid and Decanoic Acid

CAS NO, EC / EINECS NO AND INCI NAME

Product name: Caprylic-Capric Acid
Chemical inventory designation: Fatty acids, C8-10 (IUPAC: Reaction mass of octanoic acid and decanoic acid)
Alternative trade names: Caprylic/Capric Acid, Caprylic Capric Acid, C8-C10 Fatty Acid, C810 Fatty Acid
Turkish names: Kaprilik-Kaprik Asit, Kaprilik Kaprik Asit, C8-C10 Yağ Asidi
CAS No (Mixture / UVCB): 68937-75-7 (broader cuts occasionally referenced under CAS 67762-36-1, Fatty acids, C6-12)
Component CAS Numbers: 124-07-2 (Caprylic Acid / Octanoic Acid, C8) and 334-48-5 (Capric Acid / Decanoic Acid, C10)
EC / EINECS No (Mixture): 273-086-2
Component EC / EINECS Numbers: 204-677-5 (Octanoic Acid) and 206-376-4 (Decanoic Acid)
INCI Names: CAPRYLIC ACID and CAPRIC ACID (declared by individual component INCI names in cosmetic ingredient documentation)
Food Additive Code: E570 (Fatty acids, European Union) / 21 CFR 172.860, 21 CFR 184.1025 & 21 CFR 178.1010 (US FDA)
Molecular Formula: Binary mixture of C8H16O2 (CH3(CH2)6COOH) and C10H20O2 (CH3(CH2)8COOH) (often indexed in chemical databases by the midpoint average formula C9H18O2)
Average Molecular Weight: Approximately 154.0 to 158.5 g/mol depending on C8:C10 weight ratio (pure C8 = 144.21 g/mol; pure C10 = 172.26 g/mol)
Chemical Class: Saturated straight-chain medium-chain monocarboxylic fatty acid mixture (C8:0 + C10:0)
Physical Form: Clear, colorless to pale yellowish oily liquid above 0–10 °C; white crystalline slush or solid below 0 °C
Ionic Character: Weak monoprotic organic acid blend (pKa ~4.89–4.90 at 25 °C; nonionic lipophilic acid in acidic solutions, anionic carboxylate soap in alkaline solutions)
Standard Commercial C8:C10 Ratios: 60:40, 58:42, or 55:45 w/w C8:C10 (typical specification range: 50%–65% C8 and 35%–48% C10)
Primary Functions: Acyl building block for MCT oil and cosmetic emollient esters, synthetic polyol ester (POE) lubricant monomer, alkanolamine-carboxylate corrosion inhibitor precursor, low-foam acidic food-contact surface sanitizer active, agricultural contact herbicide active, non-yellowing alkyd resin modifier, liquid PVC heat stabilizer intermediate, and perfumery/dye intermediate
Because Caprylic-Capric Acid is a binary fraction of variable C8:C10 ratio rather than a single pure compound, regulatory dossiers and SDS documents may cite either the mixture identifier CAS No. 68937-75-7 (EC No. 273-086-2) or the two constituent identifiers CAS No. 124-07-2 (Octanoic acid, EC 204-677-5) and CAS No. 334-48-5 (Decanoic acid, EC 206-376-4).
Buyers consulting online chemical catalogs will frequently see CAS 68937-75-7 listed with the molecular formula C9H18O2 and molecular weight 158.24 g/mol. This is simply a mathematical midpoint between C8H16O2 (144.21 g/mol) and C10H20O2 (172.26 g/mol), not actual odd-carbon pelargonic acid (nonanoic acid, CAS 112-05-0). Natural vegetable-derived Caprylic-Capric Acid consists exclusively of even-numbered carbon chains.
During procurement and incoming quality inspection, CAS No. 68937-75-7 (Caprylic-Capric Acid) must be distinguished from pure Caprylic Acid (CAS 124-07-2), pure Capric Acid (CAS 334-48-5), whole topped coconut fatty acid (CAS 61788-47-4), and neutral esterified Caprylic/Capric Triglyceride (CAS 73398-61-5).

CHEMICAL STRUCTURE AND MOLECULAR PROPERTIES OF CAPRYLIC-CAPRIC ACID

Caprylic-Capric Acid comprises two linear saturated aliphatic carboxylic acid homologues: octanoic acid, built from a seven-carbon n-heptyl tail (CH3(CH2)6-) attached to a terminal carboxyl group (-COOH), and decanoic acid, built from a nine-carbon n-nonyl tail (CH3(CH2)8-) attached to an identical terminal carboxyl group (-COOH). In lipid shorthand, the two molecules are written as C8:0 and C10:0, signifying eight and ten carbon atoms with zero carbon-carbon double bonds.
Complete saturation across both chains imparts outstanding resistance to free-radical autoxidation and thermal degradation. Whereas unsaturated liquid fatty acids such as oleic acid (C18:1) or linoleic acid (C18:2) contain allylic and bis-allylic methylene carbons that peroxidize rapidly in air—producing rancid aldehydes, ketones, dark brown color bodies, and sticky polymer films—Caprylic-Capric Acid has only strong carbon-carbon sigma bonds. Consequently, it withstands esterification temperatures of 200 to 230 degrees Celsius and high-temperature lubricant service without yellowing, coking, or turning rancid.

A defining thermodynamic feature of Caprylic-Capric Acid is binary eutectic freezing-point depression. In isolation, pure Caprylic Acid (C8) solidifies at 16.3 to 16.5 degrees Celsius, and pure Capric Acid (C10) is a crystalline solid at room temperature melting at 31.4 to 31.6 degrees Celsius. When C8 and C10 molecules are co-distilled in commercial weight ratios of roughly 55:45 to 62:38, the two-carbon difference in chain length prevents the heptyl and nonyl tails from aligning into a regular, tightly packed crystalline lamella.

This packing frustration lowers the solidification point (titer) of Caprylic-Capric Acid to approximately 0 to 10 degrees Celsius (with the binary eutectic trough reaching roughly -2 to +3 degrees Celsius near 65–70 wt% C8). As a result, Caprylic-Capric Acid stays a clear, pumpable liquid at cool warehouse temperatures (10 to 15 degrees Celsius) where both pure C8 and pure C10 would be frozen solid in their drums.
In the neat liquid phase and in non-polar hydrocarbon or ester solvents, the carboxyl groups of octanoic and decanoic acids pair via intermolecular hydrogen bonding into eight-membered cyclic dimers (C8–C8, C10–C10, and mixed C8–C10 dimers). Cyclic dimerization shields the polar hydroxyl and carbonyl groups, raising the atmospheric boiling range of Caprylic-Capric Acid to 237–270 degrees Celsius and keeping ambient vapor pressure very low (~0.002 to 0.004 hPa at 25 °C).

In aqueous systems, both C8 (pKa ~4.89) and C10 (pKa ~4.90) behave as weak monoprotic acids whose charge and phase distribution shift sharply with pH, while offering complementary hydrophobic partitioning: octanoic acid exhibits an octanol-water partition coefficient (log Kow) of 3.05 and an aqueous solubility of ~0.68 g/L at 20 degrees Celsius, whereas decanoic acid exhibits a log Kow of 4.09 and an aqueous solubility of ~0.06 to 0.15 g/L at 20 degrees Celsius.
At acidic pH below 3.8–4.0, over 90 percent of both C8 and C10 acids remain uncharged lipophilic monomers (R-COOH) that partition rapidly into microbial membranes, waxy plant cuticles, and organic oil phases. At neutral-to-alkaline pH above 7.0–8.5, neutralization with alkali hydroxides or alkanolamines converts both chains into water-soluble octanoate and decanoate anions (R-COO-). Because eight- and ten-carbon tails are short compared to C12–C18 soaps, aqueous caprylate/caprate salts exhibit high critical micelle concentrations and rapid micellar relaxation kinetics, providing fast dynamic wetting, hydrotropic solubilization, and anodic metal passivation without stabilizing persistent macro-foam.

PRODUCTION AND CHEMICAL ORIGIN OF CAPRYLIC-CAPRIC ACID

Industrial production of Caprylic-Capric Acid relies on the oleochemical fractionation of tropical lauric seed oils—specifically coconut oil (Cocos nucifera) and palm kernel oil (Elaeis guineensis). While temperate vegetable oils (soybean, rapeseed, sunflower) and animal fats consist predominantly of C16 and C18 chains with no medium-chain fraction, coconut oil contains roughly 5% to 9% C8 caprylic acid and 5% to 8% C10 capric acid, and palm kernel oil contains roughly 3% to 5% C8 caprylic acid and 3% to 4% C10 capric acid.
Within both parent oils, C8 and C10 fatty acids occur naturally in a weight proportion of approximately 55:45 to 60:40, alongside 45% to 53% C12 lauric acid and 16% to 21% C14 myristic acid. Commercial isolation of Caprylic-Capric Acid uses high-pressure hydrolysis followed by vacuum fractional distillation to separate the medium-chain C8–C10 cut from both the malodorous C6 fore-run and the higher-melting C12–C18 bottoms.

The standard multi-stage oleochemical manufacturing process proceeds through three sequential operations:
- 1. High-Pressure Countercurrent Steam Splitting: Crude or refined coconut oil or palm kernel oil is pumped into the base of a vertical splitting tower operating at 240 to 260 degrees Celsius and 45 to 60 bar against a downward countercurrent stream of demineralized water. Catalyst-free thermal hydrolysis cleaves >99% of the triglyceride ester bonds, yielding an aqueous bottom stream of sweetwater (10%–20% glycerol) and an overhead stream of crude split C6–C18 fatty acids.

- 2. Vacuum Topping of C6 Caproic Acid and Odor Volatiles: After vacuum drying, the crude split fatty acids enter a fore-run ('topping') fractionation column operating at 10 to 30 mbar with structured stainless steel packing. Because six-carbon caproic acid boils ~28–30 degrees Celsius below eight-carbon caprylic acid, the topping column strips C6 hexanoic acid, trace aldehydes/ketones, and dissolved water overhead, lowering residual C6 in the column bottoms to <= 0.5% (or <= 0.2%–0.3% in deodorized cosmetic grades).

- 3. Overhead Co-Distillation of the C8–C10 Caprylic-Capric Heart Cut: The topped fatty acid stream is fed into the medium-chain vacuum distillation column (operating at 5 to 15 mbar and reboiler temperatures of 185 to 215 degrees Celsius). Exploiting the ~22–25 degrees Celsius boiling-point gap between C10 capric acid and C12 lauric acid under vacuum, the column distills the combined C8 and C10 fraction overhead as a water-white liquid—Caprylic-Capric Acid—keeping C12 lauric acid carryover below 0.5% to 1.0%, while the C12–C18 fraction exits the bottom for lauric acid recovery.

In integrated oleochemical complexes producing fatty alcohols or methyl esters, Caprylic-Capric Acid can also be manufactured by transesterifying coconut or palm kernel oil with methanol, fractionally distilling the C8–C10 methyl ester cut (methyl octanoate and methyl decanoate), and hydrolyzing the purified methyl esters back to free Caprylic-Capric Acid and recycled methanol.
Withdrawing the co-distilled C8–C10 stream as Caprylic-Capric Acid—instead of routing it through an energy-intensive C8/C10 splitter column—saves substantial distillation steam and cooling water whenever downstream derivatives require mixed C8/C10 chains. Ataman Kimya operates as an international chemical supplier and distributor providing commercial grades of Caprylic-Capric Acid from established oleochemical producers; buyers requiring specific botanical origin statements (100% coconut vs. palm kernel) or RSPO Mass Balance / Segregated palm-kernel certification should specify these requirements when requesting a quotation.

PHYSICAL AND CHEMICAL PROPERTIES OF CAPRYLIC-CAPRIC ACID

Because Caprylic-Capric Acid is a binary mixture, its exact physical constants and wet-chemistry values vary proportionally with the gas-chromatographic weight ratio of C8 (caprylic acid) to C10 (capric acid), which is most commonly supplied as 60:40, 58:42, or 55:45 w/w C8:C10.
General technical properties and standard commercial specification ranges:
Physical appearance (at 20–25 °C): Clear, colorless to pale yellowish mobile oily liquid
Physical appearance (below 0–5 °C): White to off-white crystalline slush or solid
Odor: Mild, characteristic fatty, slightly sour odor (significantly cleaner when C6 hexanoic acid is <= 0.3%–0.5%)
CAS Registry Number: 68937-75-7 (constituent CAS: 124-07-2 and 334-48-5)
EC / EINECS Number: 273-086-2 (constituent EC: 204-677-5 and 206-376-4)
INCI Names: CAPRYLIC ACID, CAPRIC ACID
Chemical composition: Binary blend of linear octanoic acid (C8H16O2, MW 144.21 g/mol) and linear decanoic acid (C10H20O2, MW 172.26 g/mol)
Average molecular weight (for 55:45 to 60:40 C8:C10): Approximately 154.5 to 157.5 g/mol
Solidification point / Titer (ISO 935 / AOCS Tr 1a-64): Typically 0 to 10 degrees Celsius (commonly 2 to 7 °C for 60:40 cuts, and 5 to 10 °C for 55:45 cuts)
Atmospheric boiling range (at 1013 hPa): Approximately 237 to 270 degrees Celsius (mid-boiling point ~246 °C at 101.3 kPa; ~124 to 150 °C at 13.3 hPa)
Density / Specific Gravity (at 20 °C): Approximately 0.895 to 0.908 g/cm3 (typical: 0.900 to 0.903 g/cm3)
Density (at 40 °C): Approximately 0.882 to 0.890 g/cm3
Dynamic viscosity (at 20 °C): Approximately 7.0 to 10.5 mPa·s (cP)
Kinematic viscosity (at 20 °C): Approximately 7.8 to 11.5 mm2/s (cSt)
Refractive index (nD20): Approximately 1.4280 to 1.4330
Vapor pressure (at 25 °C): Approximately 0.002 to 0.004 hPa
Flash point (Closed Cup, Pensky-Martens / ISO 2719): Approximately 115 to 135 degrees Celsius
Autoignition temperature: >300 degrees Celsius (typically ~390–430 °C)
Water solubility (at 20 °C): Sparingly soluble, approximately 0.20 to 0.50 g/L depending on C8:C10 ratio (freely soluble in alkaline water above pH 7.5 as octanoate/decanoate salts)
Organic solubility: Freely miscible with ethanol, isopropanol, propylene glycol, diethyl ether, acetone, aliphatic/aromatic hydrocarbons, mineral oils, and ester oils
Acid dissociation constant (pKa at 25 °C): Approximately 4.89 to 4.90
Octanol-water partition coefficient (log Kow): 3.05 (C8 constituent) to 4.09 (C10 constituent)
Acid Value (AV, ISO 660 / AOCS Te 1a-64): Typically 354 to 370 mg KOH/g (theoretical AV is 361.3 mg KOH/g at 60:40 w/w C8:C10, and 358.1 mg KOH/g at 55:45 w/w C8:C10)
Saponification Value (SV, ISO 3657 / AOCS Tl 1a-64): Typically 355 to 372 mg KOH/g
Iodine Value (IV, Wijs method, ISO 3961): Theoretical 0.0 g I2/100 g; commercial specification typically <= 0.5 to <= 1.0 g I2/100 g
Color (APHA / Hazen Pt-Co, ISO 6271): Typically <= 30 to <= 60 APHA (or Lovibond 5.25-inch cell <= 3.0Y / 0.3R to <= 6.0Y / 0.6R)
Moisture / Water content (Karl Fischer, ISO 8534): Typically <= 0.10% to <= 0.20% w/w
Unsaponifiable matter (ISO 3596): Typically <= 0.15% to <= 0.30% w/w
Typical Capillary GC Chain-Length Distribution: C6 (Caproic acid) <= 0.5%–1.0%; C8 (Caprylic acid) 50%–65% (typically 55%–62%); C10 (Capric acid) 35%–48% (typically 38%–45%); C12 (Lauric acid) <= 0.5%–1.5%
These values are provided for general technical orientation and must not be treated as universal specifications for every commercial lot. Exact guaranteed limits must always be confirmed on the supplier's grade-specific TDS and batch COA.

WHY EACH IMPORTANT PROPERTY OF CAPRYLIC-CAPRIC ACID MATTERS IN PRACTICE

Synthesis engineers, R&D formulators, and incoming quality-control laboratories monitor each analytical parameter on a Caprylic-Capric Acid COA because every value directly affects plant stoichiometry, phase stability, or finished-product quality:

- Capillary Gas Chromatographic (GC) C8:C10 Ratio: Governs the blend's average molecular weight, eutectic freezing point, derived ester viscosity, and aqueous hard-water tolerance. A higher C8 fraction (e.g., 60:40 C8:C10) increases the Acid Value, lowers the viscosity and pour point of synthesized MCT oils and polyol esters, and improves calcium stability in water-dilutable metalworking coolants and CIP sanitizers. A higher C10 fraction (e.g., 55:45 or 50:50) increases lipophilic partitioning, raises ester viscosity slightly, and shifts the titer closer to 8–10 degrees Celsius.

- Acid Value (AV, mg KOH/g): Because pure C8 Caprylic Acid has a theoretical Acid Value of 389.05 mg KOH/g and pure C10 Capric Acid has a theoretical Acid Value of 325.74 mg KOH/g, the batch Acid Value (typically 358–365 mg KOH/g) directly reflects the C8:C10 balance and dictates the exact stoichiometric charge weight of glycerol, TMP, pentaerythritol, KOH, or alkanolamines in batch manufacturing. Calculating reactor charges from the actual batch COA Acid Value prevents excess unreacted acid or alkalinity drift.

- Saponification Value (SV) and Ester Value (SV minus AV): Saponification Value measures both free carboxylic acids and any unsplit triglycerides or methyl esters. In properly split and distilled Caprylic-Capric Acid, SV should lie within 0.5 to 2.0 mg KOH/g of AV. A higher Ester Value indicates unsplit neutral oils that fail to neutralize in alkaline cleaners or machining coolants and cause hazy emulsions.

- Light-Cut Impurity Limit (C6 Caproic Acid, %): Six-carbon hexanoic acid carries a sharp, offensive goat-like odor and lowers the closed-cup flash point. Keeping C6 <= 0.5% (and <= 0.2%–0.3% in cosmetic grades) ensures neutral-smelling MCT oils, personal care emollients, and metalworking fluids.

- Heavy-Cut Impurity Limit (C12 Lauric Acid, %): Twelve-carbon lauric acid melts at 44 degrees Celsius, stabilizes high macro-foam, and precipitates rapidly with calcium ions in hard water. Limiting C12 to <= 0.5%–1.0% preserves zero-foam behavior in CIP spray loops and high-pressure CNC coolants.

- Iodine Value (IV, g I2/100 g) and APHA/Lovibond Color: Confirm complete saturation and freedom from unsaturated oleic carryover or iron contamination. Specifying IV <= 0.5 g I2/100 g and color <= 30 APHA guarantees water-white clarity and prevents thermal yellowing during 220 °C esterification.

- Solidification Point / Titer (0 to 10 °C): Demonstrates the eutectic liquid advantage over pure C8 (16.5 °C) and pure C10 (31.5 °C) in cool storage, while alerting operators that sub-zero winter shipments require gentle warming and homogenization before pumping.

- Moisture Content (Karl Fischer, <= 0.10%–0.20%): Prevents hydrolysis of titanate or tin esterification catalysts and avoids HCl gas evolution in acid chloride synthesis.

HOW DOES CAPRYLIC-CAPRIC ACID WORK AT THE MOLECULAR LEVEL?

Caprylic-Capric Acid combines the molecular properties of eight-carbon and ten-carbon linear saturated chains to achieve synergistic performance across chemical synthesis, interfaces, and biological membranes:

- Statistical Mixed-Acyl Esterification and Pour-Point Depression: When Caprylic-Capric Acid reacts with trifunctional glycerol (to form MCT oil) or hindered polyols such as trimethylolpropane (TMP) and pentaerythritol (PE), the C8 and C10 chains distribute randomly across the alcohol hydroxyl sites. Whereas pure C10 tricaprin is a solid melting at ~31 degrees Celsius and pure C8 tricaprylin freezes near 9–10 degrees Celsius, the statistical mixture of asymmetric C8/C8/C10 and C8/C10/C10 glycerol triesters in Caprylic/Capric Triglyceride resists crystal lattice packing, depressing the cloud and pour point below -5 to -15 degrees Celsius (and below -45 degrees Celsius in hindered polyol esters).

- Synergistic Dual-Chain Membrane Disruption and Intracellular Acidification: In acidic aqueous solutions (pH 2.0 to 4.0, below pKa ~4.89), both C8 and C10 exist as uncharged lipophilic monomers (R-COOH). Against bacteria, yeasts, molds, and enveloped viruses, the two homologues act synergistically: the more water-soluble C8 octanoic acid (~0.68 g/L solubility) crosses the aqueous boundary layer and Gram-negative outer lipopolysaccharide (LPS) membrane rapidly, while the more hydrophobic C10 decanoic acid (log Kow 4.09) partitions deeply into the phospholipid bilayer core, disordering lipid acyl chains and inducing leakage pores. Once inside the neutral cytoplasm (pH ~7.2), both acids dissociate into carboxylate anions and free protons (H+), collapsing intracellular pH and ATP synthesis.

- Equilibrium Perhydrolysis to Mixed Peroxyoctanoic and Peroxydecanoic Acids: In acidic hydrogen peroxide (H2O2) and acetic acid disinfectant concentrates, Caprylic-Capric Acid reacts reversibly with H2O2 to establish an equilibrium concentration of lipophilic peroxyoctanoic and peroxydecanoic acids, which penetrate hydrophobic biofilms and fungal/bacterial spores far more effectively than peroxyacetic acid alone.

- Mixed-Chain Anodic Chemisorption on Ferrous Metals: When neutralized with alkanolamines (MEA, TEA, DGA, or AMP) in water-miscible metalworking coolants at pH 8.5 to 9.8, octanoate and decanoate carboxylate headgroups (-COO-) coordinate with positively charged iron oxide sites on freshly machined steel and cast iron. The mixed C8 and C10 hydrocarbon tails project outward to form a compact hydrophobic barrier layer that blocks oxygen and corrosive chloride/sulfate ions without stabilizing foam.

- Cuticle Wax Solubilization in Contact Herbicides: Applied to weed foliage as an acidic emulsion or potassium/ammonium soap, C8 and C10 chains intercalate into epicuticular plant waxes, dissolving the cuticle barrier and disrupting epidermal cell membranes to cause rapid turgor loss and solar desiccation.

- Fast-Relaxing Hydrotropic Wetting: In alkaline cleaners and liquid soaps, octanoate and decanoate anions exhibit high critical micelle concentrations and fast monomer exchange rates, reducing dynamic surface tension and coupling nonionic surfactants without gelling or heavy foaming.

WHAT PROBLEMS CAN CAPRYLIC-CAPRIC ACID HELP SOLVE?

Process engineers and formulators select Caprylic-Capric Acid to resolve seven practical manufacturing, handling, and cost-in-use bottlenecks.
Solidification, drum-heating delays, and steam costs of pure C8 and pure C10 acids
Pure Capric Acid (C10) is a solid below 31.5 degrees Celsius requiring heated storage rooms and steam-traced piping year-round, while pure Caprylic Acid (C8) freezes below 16.5 degrees Celsius during cool weather. Because Caprylic-Capric Acid is a binary eutectic liquid with a solidification range of 0 to 10 degrees Celsius, it remains a pumpable liquid at standard warehouse temperatures down to ~10 degrees Celsius, eliminating routine drum thawing in mild climates.

High distillation cost of purchasing pure C8 and pure C10 separately for mixed esters
Major medium-chain ester commodities—including nutritional and cosmetic Caprylic/Capric Triglyceride (MCT oil), Propylene Glycol Dicaprylate/Dicaprate, Coco-Caprylate/Caprate, and mixed C8/C10 polyol ester lubricants—naturally require both C8 and C10 chains. Sourcing co-distilled Caprylic-Capric Acid avoids paying for the high-reflux fractional distillation split between C8 and C10 only to re-mix them in the esterification reactor.

Oxidative rancidity, yellowing, and varnish deposits of unsaturated fatty acids
Unsaturated liquid fatty acids such as oleic acid (C18:1) and tall oil fatty acids (TOFA) autoxidize at their double bonds when exposed to heat and air, causing rancid odors, dark brown discoloration, and sticky varnish on machinery. Fully saturated Caprylic-Capric Acid (C8:0 and C10:0) delivers liquid handling while remaining immune to olefinic oxidation and yellowing.

Pump cavitation and chemical residues from high-foaming CIP sanitizers
Quaternary ammonium sanitizers foam heavily in high-pressure clean-in-place (CIP) spray balls—causing pump cavitation—and leave persistent cationic residues on food equipment, while chlorine sanitizers pit stainless steel welds. Acidified Caprylic-Capric Acid sanitizers provide rapid broad-spectrum bactericidal and yeasticidal knockdown with zero macro-foam and drain cleanly.

Flash rusting and hard-water soap-scum filter blinding in metalworking coolants
Long-chain oleate, tallate, and laurate corrosion inhibitors react with hard water to form sticky calcium soap curds that blind coolant filters and foam in high-pressure CNC delivery systems. Alkanolamine salts of Caprylic-Capric Acid protect cast iron and steel against flash rust with low foaming and cleaner sump longevity.

Persistent soil and groundwater residues in agricultural weed management
Contact burndown herbicides formulated with Caprylic-Capric Acid rapidly desiccate weed foliage by disrupting cuticles and epidermal membranes, then biodegrade rapidly in soil without leaving persistent chemical residues.

Pungent malodor and low flash points of un-topped volatile fatty acids
Crude coconut fore-runs or C4–C6 volatile fatty acids contain high levels of butyric and caproic acid (C6), producing an offensive goat-like stench. Properly topped Caprylic-Capric Acid (C6 <= 0.5% or <= 0.2%) eliminates sharp C6 malodor while maintaining high medium-chain carboxyl density.

BENEFITS FOR THE MANUFACTURER AND END USER

Incorporating Caprylic-Capric Acid provides measurable operational benefits inside the production plant and functional advantages for the end user.

Benefits for the Manufacturer, Synthesis Engineer, and Formulator:

- Eutectic Liquid Handling Window (0 to 10 °C): Eliminates year-round melting of solid C10 Capric Acid (31.5 °C) and extends liquid pumpability 10 to 15 °C lower than pure C8 Caprylic Acid (16.5 °C).
- Cost-Effective Medium-Chain Carboxyl Feedstock: Co-distillation of the natural C8+C10 lauric oil cut provides saturated medium-chain acid functionality at a lower raw-material cost than single-cut 99% C8 or C10 fractions.
- High Molar Carboxyl Density: With an Acid Value of ~354 to 370 mg KOH/g (average MW ~155–157 g/mol), one metric ton of Caprylic-Capric Acid delivers ~6,350 to 6,450 moles of reactive carboxyl groups—roughly 80% more molar functionality per ton than oleic or stearic acid.
- Low Newtonian Viscosity (~7 to 10 mPa·s at 20 °C): Enables accurate dosing via metering pumps, rapid mixing, and high heat- and mass-transfer rates in esterification reactors.
- High-Temperature Color Stability: Complete saturation (IV <= 0.5–1.0 g I2/100 g) permits esterification at 200–230 °C without charring or yellowing.
- Non-Foaming Processing: Neither protonated Caprylic-Capric Acid nor its octanoate/decanoate salts stabilize persistent macro-foam under high-shear agitation or spray circulation.
Benefits for the Final Product and End User:
- Colorless, Odor-Stable, Oxidation-Proof Esters: MCT oils, cosmetic emollients, sunscreens, and lubricants synthesized from Caprylic-Capric Acid resist rancidity, peroxide buildup, and yellowing over multi-year shelf lives.
- Reliable Sub-Zero Fluidity: Random C8/C10 chain distribution on glycerol or polyol backbones prevents crystallization, keeping MCT oils clear at refrigerator temperatures and synthetic POE lubricants fluid below -40 °C.
- Residue-Free, Non-Foaming CIP Sanitization: Dairy, brewery, and food-processing plants achieve rapid microbial hygiene without pump cavitation or off-flavor residues.
- Clean Ferrous Rust Protection: Machined cast-iron and steel parts remain protected against inter-operational flash rust without sticky film deposits.

APPLICATIONS OF CAPRYLIC-CAPRIC ACID

Caprylic-Capric Acid is deployed across chemical synthesis and industrial formulation whenever a liquid, fully saturated C8–C10 carboxylic acid cut is required.

Medium-chain triglyceride (MCT oil) manufacturing for nutrition, pharma, and cosmetics
The primary global use of Caprylic-Capric Acid is the direct esterification of refined vegetable glycerol to produce Caprylic/Capric Triglyceride (MCT Oil, CAS 73398-61-5). Reacting three moles of Caprylic-Capric Acid per mole of glycerol at 200–230 degrees Celsius under vacuum yields a water-white, low-viscosity (~27–33 mPa·s), oxidation-resistant liquid triester. Depending on the regulatory grade of Caprylic-Capric Acid selected, the resulting MCT oil is used as a rapid-energy ketogenic and clinical nutrition lipid, a compendial pharmaceutical drug-delivery vehicle, a food-grade pan-release and clouding oil, or a lightweight cosmetic emollient.

Cosmetic emollient mono-/diesters and micellar surfactant synthesis
In personal care ester plants, Caprylic-Capric Acid is reacted with propylene glycol, coconut/cetyl fatty alcohols, polyglycerols, or ethoxylated glycerides to manufacture Propylene Glycol Dicaprylate/Dicaprate, Coco-Caprylate/Caprate, Cetyl Caprylate/Caprate, Glyceryl Caprylate/Caprate, and PEG-6 / PEG-8 Caprylic/Capric Glycerides for facial creams, sunscreens, lipsticks, and micellar cleansing waters.

Synthetic polyol ester (POE) refrigeration and aviation turbine lubricants
In synthetic lubricant manufacturing, Caprylic-Capric Acid is esterified with hindered polyols—neopentyl glycol (NPG), trimethylolpropane (TMP), pentaerythritol (PE), and dipentaerythritol (DiPE)—to synthesize ISO VG 10 to VG 68 polyol ester base stocks. The saturated C8 and C10 chains deliver pour points below -40 to -50 °C, high flash points, thermo-oxidative cleanliness, and complete miscibility with HFC and HFO refrigerants in air-conditioning/refrigeration compressors, jet turbine engines, high-temperature oven chains, and biodegradable hydraulic oils.

Water-miscible metalworking fluids and corrosion inhibitor packages
In synthetic and semi-synthetic cutting, grinding, and rolling coolants, Caprylic-Capric Acid is neutralized with monoethanolamine (MEA), triethanolamine (TEA), diglycolamine (DGA), or 2-amino-2-methyl-1-propanol (AMP) to form low-foaming amine octanoate/decanoate corrosion inhibitors that passivate cast iron and carbon steel against flash rust.

Low-foam acidic food-contact CIP sanitizers and peracid disinfectants
In dairy, brewery, winery, beverage bottling, and meat-processing plants, Caprylic-Capric Acid serves as the non-foaming antimicrobial active in acidic clean-in-place (CIP) sanitizing concentrates (buffered below pH 3.5 with phosphoric, lactic, or citric acid and solubilized by sulfonate hydrotropes) and in equilibrium peroxyoctanoic/peroxydecanoic acid mixtures with hydrogen peroxide.

Agricultural non-selective contact herbicides and crop desiccants
In agriculture and horticulture, Caprylic-Capric Acid is formulated into emulsifiable concentrates (EC) or potassium/ammonium soap sprays for rapid contact burndown of broadleaf and grass weeds, orchard/vineyard floor strip weeding, sucker control, potato haulm desiccation, and moss/algae removal.

Non-yellowing short-oil alkyd resins and baking enamels
In industrial coatings, Caprylic-Capric Acid acts as a saturated chain-terminating modifier in high-solids, short-oil baking alkyds cured with melamine-formaldehyde or polyisocyanate resins, preventing thermal over-bake yellowing and UV discoloration in appliance enamels and coil coatings.

Liquid PVC heat stabilizers and polymer processing aids
In plastics compounding, Caprylic-Capric Acid is reacted with calcium, barium, zinc, or magnesium oxides/hydroxides to produce liquid Ca/Zn and Ba/Zn caprylate/caprate heat stabilizers that disperse easily into PVC plastisols, calendered films, and flexible extrusions.

Perfumery aroma esters and dye manufacturing intermediates
In fine chemical synthesis, Caprylic-Capric Acid is esterified with lower alcohols (methyl, ethyl, isoamyl, phenylethyl, or geranyl alcohols) to produce fruity, wine-like, citrus, and floral fragrance/flavor esters used in perfumery, and serves as a dispersing agent and acylating intermediate in dye manufacturing.

Non-sulfide mineral froth flotation and hydrometallurgy
In mining beneficiation, Caprylic-Capric Acid and its alkali soaps function as selective collectors in the froth flotation of phosphate (apatite), fluorite, scheelite, barite, and rare-earth oxide/carbonate minerals.

WHICH INDUSTRIES USE CAPRYLIC-CAPRIC ACID?

Caprylic-Capric Acid is utilized across a broad range of regulated and heavy industrial sectors:
- Oleochemical Ester and Specialty Surfactant Manufacturing (MCT oils, mono-/diglycerides, glycol diesters, fatty alcohol esters, alkanolamides, and amino-acid surfactants)
- Cosmetics, Personal Care, and Toiletries Manufacturing (emollient synthesis, liquid soap bases, micellar solubilizers, and pH/microbiome modulators)
- Clinical Nutrition, Nutraceuticals, and Food Processing (ketogenic and medical C8/C10 MCT oil production, E570 processing aids, defoamers, and flavor esters)
- Synthetic Lubricants, Refrigeration Oils, and Tribology (HFC/HFO refrigeration compressor POE oils, aviation gas turbine lubricants, biodegradable hydraulic fluids)
- Metalworking Fluids, Industrial Coolants, and Cleaners (synthetic and semi-synthetic machining coolants, ferrous flash-rust inhibitors, alkaline spray washers)
- Dairy, Brewery, Beverage, and Institutional Hygiene (no-rinse acidic CIP food-contact sanitizers, peroxyacid brewery disinfectants, institutional hard-surface cleaners)
- Agriculture, Horticulture, and Crop Protection (non-selective contact burndown herbicides, organic-compatible weed killers, crop desiccants, pesticide adjuvants)
- Paints, Coatings, Printing Inks, and Resins (non-yellowing short-oil baking alkyds, metal carboxylate driers and catalysts, pigment wetting agents)
- Plastics, PVC Compounding, and Rubber Processing (liquid Ca/Zn and Ba/Zn PVC heat stabilizers, plastisol viscosity depressants, elastomer dispersion aids)
- Perfumery, Fragrance Esters, and Dye/Pigment Manufacturing (aroma ester synthesis, dye solubilizers and coupling intermediates)
- Mining, Mineral Processing, and Hydrometallurgy (phosphate, fluorite, and rare-earth froth flotation collectors, solvent-extraction modifiers)
Each sector emphasizes specific COA parameters: food and MCT oil producers require Food Grade / E570 / FCC compliance and strict heavy-metal limits; cosmetic ester producers require water-white color (<= 30 APHA) and low C6 odor (<= 0.3%–0.5%); lubricant synthesis engineers require low moisture (<= 0.10%), low Iodine Value (<= 0.5), and tight Acid Value control; and metalworking/sanitizer formulators require a defined C8:C10 ratio and low C12 lauric content.

USE OF CAPRYLIC-CAPRIC ACID IN COSMETICS AND PERSONAL CARE

In cosmetics and personal care manufacturing, Caprylic-Capric Acid (identified on ingredient labels by its constituent INCI names CAPRYLIC ACID and CAPRIC ACID) serves as the primary medium-chain acyl building block for lightweight emollients, micellar solubilizers, and preservative-boosting partial glycerides, as well as a direct soap and pH-adjusting component.

Key cosmetic applications and derivative pathways include:
- Manufacturing Lightweight, Non-Greasy Emollient Esters: Reacting cosmetic-grade Caprylic-Capric Acid with vegetable glycerol, propylene glycol, or coconut fatty alcohols produces Caprylic/Capric Triglyceride, Propylene Glycol Dicaprylate/Dicaprate, Coco-Caprylate/Caprate, and Cetyl Caprylate/Caprate. These esters impart rapid spreading, dry-touch cushion, and complete oxidative stability in facial creams, sunscreens, foundations, lipsticks, and body oils.
- Producing Multifunctional Skin-Conditioning and Antimicrobial Partial Glycerides: Partial esterification with glycerol or polyglycerols yields Glyceryl Caprylate/Caprate and Polyglyceryl-3 Caprate/Caprylate, which function as refatting co-emulsifiers and membrane-active preservative boosters.
- Synthesizing Gentle Micellar Water Solubilizers: Ethoxylating C8–C10 partial glycerides produces PEG-6 Caprylic/Capric Glycerides and PEG-8 Caprylic/Capric Glycerides for no-rinse micellar cleansing waters and makeup removers.
- Formulating Fast-Lathering, Quick-Rinsing Liquid Soaps: Neutralized in situ with potassium hydroxide, sodium hydroxide, or triethanolamine alongside C12–C14 acids in liquid hand soaps, body washes, and shaving creams, the C8–C10 fraction boosts flash foam and clean rinsing.
- Solubilizing Crystalline UV Filters and Dispersing Pigments: Esters derived from Caprylic-Capric Acid dissolve high loadings of organic UV filters and wet inorganic TiO2 and ZnO sunblocks.

Cosmetic buyers should specify a refined, deodorized vegetable grade with low C6 caproic acid content (<= 0.3%–0.5% max) to avoid fatty goat-like top-notes, water-white APHA color (<= 30), low Iodine Value (<= 0.5 g I2/100 g), and full cosmetic regulatory documentation (100% coconut or RSPO Mass Balance / Segregated palm kernel origin, vegan, Non-GMO, BSE/TSE-free, and heavy-metal compliance).

USE OF CAPRYLIC-CAPRIC ACID IN FOOD AND BEVERAGE APPLICATIONS

When produced under hygienic food-safety management systems (FSSC 22000 / HACCP) and supplied as a verified Food Grade / FCC / EU E570 compliant product, Caprylic-Capric Acid is a foundational raw material for nutritional lipids, food-processing aids, flavor esters, and food-plant sanitization.
Principal food, beverage, and clinical nutrition roles include:
- Synthesizing Nutritional Medium-Chain Triglycerides (C8/C10 MCT Oil): Standard nutritional MCT oil (typically 55%–65% C8 and 35%–45% C10 esterified onto glycerol) is manufactured directly from Food Grade Caprylic-Capric Acid and food-grade vegetable glycerin. Because C8 and C10 triglycerides are hydrolyzed rapidly in the gut and transported directly via the portal vein to the liver for beta-oxidation and ketone body generation without requiring bile salts or carnitine transport, C8/C10 MCT oil is widely used in ketogenic supplements, clinical enteral/parenteral nutrition, preterm infant formulas, and sports nutrition.
- Producing Food-Grade Pan-Release Oils, Confectionery Glazes, and Beverage Clouding Agents: MCT oils and mono-/diglycerides made from Food Grade Caprylic-Capric Acid act as oxidation-proof anti-sticking release agents and polishing glazes for dried fruits, gummies, and bakery pans, and as neutral weighting/clouding oils in beverage flavor emulsions.
- Acting as a Regulated Food Additive and Processing Aid (EU E570 / US FDA 21 CFR 172.860): Edible vegetable-derived straight-chain fatty acids are permitted under EU food additive code E570 (Fatty acids) and US 21 CFR 172.860 / 21 CFR 184.1025 as defoamer components (in sugar refining, yeast fermentation, and potato processing), surface coatings, and carriers for fat-soluble nutrients and colors.
- Synthesizing Dairy, Cheese, and Fruity Flavor Esters: Esterification with ethanol or isoamyl alcohol produces mixed octanoate/decanoate flavor esters for cheese, butter, coconut, brandy, and tropical fruit flavorings.
- Formulating No-Rinse Food-Contact Surface Sanitizers (21 CFR 178.1010 / 40 CFR 180.940): Acidic aqueous sanitizers based on octanoic and decanoic acids sanitize dairy tanks, brewery fermenters, beverage lines, and meat conveyors without requiring a potable water rinse when drained properly.
Food-sector buyers must verify Food Grade / E570 / FCC compliance on the COA and supplier declarations, including heavy metal limits (Pb, As, Hg, Cd), sulfated ash (<= 0.1%), unsaponifiable matter, peroxide/iodine limits, absence of mineral acids and PAHs, and valid Kosher, Halal, Non-GMO, and Allergen-Free certificates. Industrial grades must never be used in food production.

PHARMACEUTICAL AND BIOTECHNOLOGY APPLICATIONS OF CAPRYLIC-CAPRIC ACID

In pharmaceutical excipient synthesis and drug-delivery formulation, Caprylic-Capric Acid is the parent acyl raw material for compendial medium-chain lipid vehicles, self-emulsifying drug delivery systems (SEDDS), and bioavailability-enhancing partial glycerides.
Key pharmaceutical applications include:
- Manufacturing Compendial Medium-Chain Triglycerides (Ph. Eur. Triglycerida saturata media / USP-NF Medium-Chain Triglycerides): Pharmacopoeial monographs for Medium-Chain Triglycerides require a neutral triester whose fatty acid fraction consists of 50.0% to 80.0% octanoic (caprylic, C8) acid and 20.0% to 50.0% decanoic (capric, C10) acid, with <= 1.0%–2.0% C6 and <= 3.0% C12. High-purity Caprylic-Capric Acid distilled to this exact chain distribution is esterified with pharmaceutical glycerol to produce compendial MCT oil for oral solutions, softgels, topical/nasal sprays, and parenteral lipid emulsions.
- Synthesizing Caprylocaproyl Polyoxyl-8 Glycerides and Glyceryl Monocaprylocaprate for SEDDS / SMEDDS: Reacting Caprylic-Capric Acid with glycerol and PEG-400 produces compendial Caprylocaproyl Macrogol-8 Glycerides (Ph. Eur. / USP-NF) and Glyceryl Monocaprylocaprate, which solubilize poorly water-soluble BCS Class II and Class IV active pharmaceutical ingredients (APIs) and enhance intestinal permeation.
- Synthesizing Propylene Glycol Dicaprylocaprate (Ph. Eur. / USP-NF): Used as a low-viscosity lipophilic vehicle in transdermal, topical, otic, and veterinary formulations.
- Critical Distinction for Downstream Bioprocess Plasma IgG Fractionation: While Caprylic-Capric Acid (C8-C10 blend, CAS 68937-75-7) is the required feedstock for compendial C8/C10 MCT oil and macrogol glyceride excipients, downstream blood-plasma IgG fractionation and viral inactivation require single-cut pure Octanoic Acid (CAS 124-07-2, >= 98.0%–99.0% C8) because 40% C10 decanoic acid lowers aqueous solubility at pH 4.8–5.2 and alters protein precipitation selectivity.

INDUSTRIAL, LUBRICANT, METALWORKING AND SANITIZER APPLICATIONS OF CAPRYLIC-CAPRIC ACID

In industrial manufacturing, tribology, metalworking, and institutional hygiene, Caprylic-Capric Acid delivers a low-freezing, oxidation-proof saturated medium-chain acid at an economical cost-in-use.
Key industrial roles include:
- Synthetic Polyol Ester (POE) Refrigeration and Turbine Lubricants: Esterification with neopentyl glycol (NPG), trimethylolpropane (TMP), or pentaerythritol (PE) yields ISO VG 10 to VG 68 polyol esters with sub-zero pour points (<-40 to -55 °C), high flash points, strong thermal-oxidative stability, and full miscibility with HFC (R-134a, R-410A, R-404A) and HFO (R-1234yf, R-1234ze) refrigerants for HVAC/R compressors, aviation turbines, oven chains, and biodegradable hydraulic fluids.
- Alkanolamine Carboxylate Corrosion Inhibitors for Metalworking Fluids: Neutralized with monoethanolamine (MEA), triethanolamine (TEA), diglycolamine (DGA), or 2-amino-2-methyl-1-propanol (AMP) in synthetic and semi-synthetic coolants (pH 8.5–9.8), Caprylic-Capric Acid forms mixed octanoate/decanoate salts that chemisorb onto cast iron and steel to prevent flash rust without foaming in high-pressure CNC delivery systems.
- Low-Foam Acidic Clean-in-Place (CIP) Sanitizers and Peroxyacid Disinfectants: Formulated at 2% to 8% w/w with phosphoric, lactic, or citric acid, glycols, and anionic sulfonate hydrotropes, Caprylic-Capric Acid provides non-foaming bactericidal and fungicidal sanitization at 100 to 400 ppm active fatty acid (pH < 3.5), and generates mixed peroxyoctanoic/peroxydecanoic acids in equilibrium hydrogen peroxide systems.
- Non-Yellowing Alkyd Resins, Liquid PVC Stabilizers, and Mineral Flotation: Acts as a saturated chain stopper in non-yellowing appliance and coil baking alkyds; reacts with Ca, Ba, and Zn oxides to form liquid PVC heat stabilizers; and functions as a selective collector in phosphate, fluorite, and rare-earth mineral flotation.

FORMULATION AND PROCESS CONSIDERATIONS WHEN USING CAPRYLIC-CAPRIC ACID

Process engineers and formulators working with Caprylic-Capric Acid should control six key operational parameters:
- 1. Stoichiometric Calculation from Batch COA Acid Value: Because the C8:C10 weight ratio can shift slightly within specification between lots (e.g., 56:44 vs. 61:39), the batch Acid Value varies between ~354 and 370 mg KOH/g (equivalent weight 151.6 to 158.5 g/mol). Always calculate glycerol, polyol, NaOH, KOH, or alkanolamine charge weights directly from the delivered lot's COA Acid Value (Equivalent weight = 56,105.6 / AV) rather than a fixed nominal molecular weight.

- 2. Cold-Weather Conditioning and Full-Container Homogenization: Although eutectic depression lowers the solidification point of Caprylic-Capric Acid to 0 to 10 degrees Celsius, sub-zero winter transit can cause partial crystallization. When partial freezing occurs, higher-melting C10 capric acid (MP 31.5 °C) crystallizes first and settles to the bottom while the top liquid becomes enriched in C8 caprylic acid (MP 16.5 °C). Never pump from a partially frozen or cloudy container; warm the entire drum or IBC gently in a warm room or hot box (20 to 35 °C, max 50 °C) until 100 percent clear and mix thoroughly before use.

- 3. Hard-Water Calcium Management for the C10 Fraction: Because calcium decanoate (C10) is less soluble in water than calcium octanoate (C8), aqueous metalworking coolants or alkaline cleaners diluted in hard water (>250–350 ppm CaCO3) should incorporate a chelating agent (GLDA, MGDA, EDTA, or gluconate) or nonionic/ether-carboxylate coupler and maintain pH 9.0–9.6 to prevent calcium caprate haze.

- 4. Solubilization in Acidic Aqueous Concentrates: Protonated Caprylic-Capric Acid dissolves in water at only ~0.20 to 0.50 g/L at 20 °C. In acidic CIP sanitizer concentrates (3%–8% Caprylic-Capric Acid), pre-dissolve the acid in propylene glycol, dipropylene glycol, or isopropanol together with an acid-stable anionic sulfonate hydrotrope/surfactant (sodium octane sulfonate, xylene sulfonate, or alkyl diphenyl oxide disulfonate) before blending into the aqueous phosphoric or lactic acid phase.

- 5. Exotherm Control During Neutralization: Neutralizing neat Caprylic-Capric Acid with 50% NaOH, 45% KOH, or neat MEA releases ~55–60 kJ/mol. Meter the acid gradually subsurface into the cooled aqueous alkaline solution below 45–50 °C.

- 6. Materials of Construction: Neat Caprylic-Capric Acid corrodes carbon steel, cast iron, copper, brass, bronze, and zinc, causing iron (yellow-brown) or copper (blue-green) discoloration. Use AISI 316L (or 304) stainless steel, HDPE, polypropylene (ambient), or glass-lined vessels, with PTFE, FFKM, or verified chemical-grade fluoroelastomer seals. Avoid natural rubber, SBR, neoprene, polyurethane, and flexible PVC.

TYPICAL USE LEVELS AND INITIAL FORMULATION APPROACHES FOR CAPRYLIC-CAPRIC ACID

Typical starting use levels for Caprylic-Capric Acid depend on the application and require laboratory verification:
- Caprylic/Capric Triglyceride (MCT Oil) and Polyol Ester (POE) Synthesis: 68% to 88% w/w of total reactor charge (1.03 to 1.15 carboxyl equivalents per hydroxyl equivalent of glycerol, TMP, NPG, or pentaerythritol prior to vacuum stripping).
- Acidic No-Rinse Food-Contact CIP Sanitizer Concentrates: 1.5% to 8.0% w/w in concentrate; diluted at 1:100 to 1:500 to deliver 100 to 400 ppm active C8–C10 fatty acid at pH < 3.5.
- Equilibrium Peroxyoctanoic/Peroxydecanoic Acid Disinfectants: 1.0% to 4.0% w/w co-formulated with acetic acid and hydrogen peroxide.
- Water-Miscible Metalworking Fluid Concentrates: 1.5% to 5.5% w/w neutralized with alkanolamines (MEA, TEA, DGA, AMP), diluted at 3% to 8% in water.
- Agricultural Non-Selective Contact Herbicide Concentrates: 25% to 65% w/w in emulsifiable concentrates (EC) or potassium/ammonium soap concentrates, diluted to 2% to 6% v/v in spray water.
- Liquid Soap and Cleanser Bases: 1.0% to 6.0% w/w neutralized with KOH or alkanolamines.
The four laboratory protocols below represent preliminary R&D screening frameworks for technical evaluation only.

EXAMPLE 1: PRELIMINARY ESTERIFICATION SCREENING FOR CAPRYLIC/CAPRIC TRIGLYCERIDE (MCT OIL) OR TMP POLYOL ESTER

Purpose: To evaluate esterification conversion, overhead reaction-water removal, and APHA color stability using Caprylic-Capric Acid (60:40 C8:C10 cut) and refined vegetable glycerol (or trimethylolpropane).
Initial laboratory stoichiometric charge:
- Refined Vegetable Glycerol (99.7% min., MW 92.09 g/mol, 3.0 OH equivalents/mol): 1.00 mol (92.1 g)
- Caprylic-Capric Acid (CAS 68937-75-7, batch COA Acid Value = 361.0 mg KOH/g, equivalent weight = 155.4 g/mol): 3.30 mol (512.8 g; 10% molar excess of acid)
- Esterification catalyst (optional, 0.05%–0.10% w/w stannous oxalate or titanate for lubricant esters, or catalyst-free thermal esterification for food/cosmetic MCT oil): per protocol
Laboratory evaluation procedure:
- Charge glycerol and liquid Caprylic-Capric Acid into a 4-neck glass reactor fitted with a mechanical stirrer, subsurface oxygen-free nitrogen sparge, thermocouple, and partial-condenser column connected to a Dean-Stark trap and vacuum pump.
- Purge with dry nitrogen for 20 minutes at ambient temperature before heating.
- Heat progressively from 140 °C to 220 °C over 5 to 6 hours while collecting reaction water (~54.0 g) overhead and returning co-distilled fatty acid to the reactor.
- Track in-process Acid Value and Hydroxyl Value until Hydroxyl Value is < 1.5–2.0 mg KOH/g (>99.5% triester conversion), then apply vacuum (5–15 mbar at 210–220 °C) to strip excess unreacted Caprylic-Capric Acid.
- Refine, deodorize, and filter the ester product to achieve a final Acid Value <= 0.1 mg KOH/g, Color <= 20 APHA, and crystal-clear stability at 0 °C for 72 hours.

EXAMPLE 2: PRELIMINARY EVALUATION OF AMINE CAPRYLATE/CAPRATE CORROSION INHIBITOR IN SEMI-SYNTHETIC METALWORKING FLUID

Purpose: To evaluate ferrous flash-rust inhibition (ASTM D4627 / IP 287), hard-water tolerance, and low foaming of an alkanolamine-neutralized Caprylic-Capric Acid sub-concentrate.
Initial screening composition (by weight):
- Deionized water: 69.5%
- Triethanolamine (TEA, 99%): 13.0%
- Monoethanolamine (MEA, 99%) or 2-Amino-2-methyl-1-propanol (AMP-95): 6.5%
- Caprylic-Capric Acid (60:40 C8:C10 blend, CAS 68937-75-7, AV ~361 mg KOH/g): 9.0%
- Tetrasodium GLDA (47% solution) or C8–C10 alcohol ethoxylate-carboxylate coupler: 2.0%
Laboratory evaluation procedure:
- Dissolve TEA, MEA (or AMP), and the chelator/coupler in deionized water at 20–25 °C.
- Meter liquid Caprylic-Capric Acid slowly subsurface over 20 minutes under agitation while keeping temperature below 45 °C.
- Mix for 30 minutes until a crystal-clear amine caprylate/caprate concentrate (pH 9.3–9.8) is obtained.
- Dilute at 2.5%, 4.0%, and 5.0% w/w in 100 ppm, 300 ppm, and 450 ppm CaCO3 hard water to verify 24-hour optical clarity, and perform ASTM D4627 cast-iron chip filter-paper rust testing.

EXAMPLE 3: PRELIMINARY TRIAL FOR LOW-FOAM ACIDIC FOOD-CONTACT CIP SANITIZER CONCENTRATE

Purpose: To evaluate concentrate stability, cold hard-water dilution clarity, and non-foaming spray behavior of Caprylic-Capric Acid in an acidic CIP sanitizer concentrate.
Initial screening composition (by weight):
- Deionized water: 43.0%
- Phosphoric acid (75% food/technical grade) or Lactic acid (88% food grade): 26.0%
- Propylene glycol or Isopropanol: 14.0%
- Sodium octane sulfonate (40% solution) or alkyl diphenyl oxide disulfonate (45%): 12.0%
- Caprylic-Capric Acid (CAS 68937-75-7, low-C6 grade): 5.0%
Laboratory evaluation procedure:
- Pre-mix propylene glycol, the anionic sulfonate surfactant/hydrotrope, and liquid Caprylic-Capric Acid at 20–25 °C until optically clear.
- Dilute the phosphoric or lactic acid in deionized water in a separate vessel and cool below 28 °C.
- Blend the organic pre-mix slowly into the agitated aqueous acid phase until homogeneous.
- Verify storage stability at 4 °C, 20 °C, and 40 °C, and test dilutions at 100 to 300 ppm active C8–C10 acid in 10 °C hard water (300 ppm CaCO3) for clarity, pH (< 3.4), and zero foaming.

EXAMPLE 4: PRELIMINARY SCREENING FOR AGRICULTURAL CONTACT HERBICIDE EMULSIFIABLE CONCENTRATE (EC)

Purpose: To evaluate spontaneous bloom and emulsion stability in spray water for a non-selective weed burndown emulsifiable concentrate based on Caprylic-Capric Acid.
Initial screening composition (by weight):
- Caprylic-Capric Acid (55:45 or 60:40 C8:C10 blend, CAS 68937-75-7): 60.0%
- Methylated seed oil (MSO) or Caprylic/Capric Triglyceride carrier: 25.0%
- Agricultural nonionic/anionic emulsifier blend (matched to HLB 10–12): 15.0%
Laboratory evaluation procedure:
- Mix Caprylic-Capric Acid, the MSO or triglyceride carrier, and the emulsifier blend at 25–30 °C until a clear, single-phase liquid concentrate forms.
- Dilute at 3.0% and 5.0% v/v in CIPAC Standard Waters A (20 ppm) and D (342 ppm) at 10 °C and 30 °C to evaluate spontaneous bloom and 2-hour emulsion stability per CIPAC MT 36.

COMPATIBILITY AND INCOMPATIBILITY OF CAPRYLIC-CAPRIC ACID

Evaluating chemical and material compatibility prevents precipitation, equipment corrosion, and seal failure when handling Caprylic-Capric Acid:
- Anionic and Amphoteric Surfactants: Fully compatible across acidic and alkaline pH ranges. Alkane sulfonates, linear alkylbenzene sulfonates, diphenyl oxide disulfonates, phosphate esters, betaines, and amine oxides solubilize Caprylic-Capric Acid effectively.
- Nonionic Surfactants: Physically compatible with alcohol ethoxylates, alkyl polyglucosides, and sorbitan esters, though high ratios of ethoxylated nonionics in acidic sanitizers can sequester free uncharged C8/C10 monomer inside micelles and reduce biocidal speed unless verified by microbiological testing.
- Cationic Surfactants (Quaternary Ammonium Compounds): Compatible below pH 3.5 where Caprylic-Capric Acid is uncharged, but incompatible above pH 5.0–5.5 where deprotonated octanoate/decanoate anions form insoluble ion-pairs with cationic quats.
- Polyvalent Metal Cations: In neutral or alkaline solutions (pH > 6.5), calcium (Ca2+), magnesium (Mg2+), iron (Fe2+/Fe3+), zinc (Zn2+), copper (Cu2+), and aluminum (Al3+) precipitate insoluble metallic soaps (especially calcium caprate) unless chelated.
- Reactive Chemical Incompatibilities: Reacts exothermically with concentrated alkalis (NaOH, KOH, neat primary/secondary amines) and is incompatible with strong oxidizers (concentrated nitric acid, chromic acid, perchlorates).
- Metals and Elastomers: Neat Caprylic-Capric Acid corrodes carbon steel, cast iron, copper, brass, bronze, and galvanized zinc, leaching iron or copper that discolors the acid. Use AISI 316L (or 304) stainless steel, HDPE, polypropylene (ambient), glass-lined steel, or PTFE equipment, with PTFE, FFKM, or verified chemical-grade fluoroelastomer gaskets and hoses. Do not use natural rubber, SBR, neoprene, polyurethane, or flexible PVC.

SIMILAR PRODUCTS AND ALTERNATIVES TO CAPRYLIC-CAPRIC ACID

Selecting between Caprylic-Capric Acid (CAS 68937-75-7) and alternative fatty acids or derivatives requires comparing solidification point, Acid Value, water solubility, chain-length purity, and regulatory status.

CAPRYLIC-CAPRIC ACID AND PURE CAPRYLIC ACID (OCTANOIC ACID, C8)

Pure Caprylic Acid (Octanoic Acid, C8H16O2, CAS No. 124-07-2, EC No. 204-677-5) is a single-cut C8 fatty acid (>= 98%–99% C8, MW 144.21 g/mol, theoretical Acid Value 389.0 mg KOH/g, freezing point ~16.5 °C). Caprylic-Capric Acid (CAS 68937-75-7) is a binary C8–C10 distillate (typically 55%–62% C8 and 38%–45% C10, average MW ~155–157 g/mol, Acid Value ~354–370 mg KOH/g, eutectic freezing point 0–10 °C).
Caprylic-Capric Acid is more economical and remains liquid at cooler warehouse temperatures (down to ~10 °C) for manufacturing standard C8/C10 MCT oil, coco-caprylate/caprate emollients, polyol ester lubricants, and contact herbicides. Pure Caprylic Acid (CAS 124-07-2) is required when the 40% C10 fraction is unacceptable—specifically in biopharmaceutical plasma IgG fractionation, pure C8 ketogenic tricaprylin synthesis, single-component ethyl octanoate flavor esters, or very hard-water coolants.

CAPRYLIC-CAPRIC ACID AND PURE CAPRIC ACID (DECANOIC ACID, C10)

Pure Capric Acid (Decanoic Acid, C10H20O2, CAS No. 334-48-5, EC No. 206-376-4) is a single-cut C10 saturated acid (MW 172.26 g/mol, theoretical Acid Value 325.7 mg KOH/g) that is a crystalline white solid at room temperature (melting point ~31.5 °C). Caprylic-Capric Acid eliminates year-round drum melting while offering a higher Acid Value (~360 mg KOH/g) and higher aqueous solubility.

CAPRYLIC-CAPRIC ACID AND LAURIC ACID (DODECANOIC ACID, C12)

Lauric Acid (Dodecanoic Acid, C12H24O2, CAS No. 143-07-7, MW 200.32 g/mol, melting point ~44 °C, Acid Value 280.1 mg KOH/g) is a solid powder or flake that forms high-foaming soaps. It cannot replace liquid, non-foaming Caprylic-Capric Acid in low-pour-point MCT and POE esters, zero-foam CIP sanitizers, or low-foam machining coolants.

CAPRYLIC-CAPRIC ACID AND PELARGONIC ACID (NONANOIC ACID, C9)

Pelargonic Acid (Nonanoic Acid, C9H18O2, CAS No. 112-05-0, MW 158.24 g/mol, melting point ~12.5 °C, Acid Value 354.6 mg KOH/g) is a synthetic odd-carbon linear acid whose molecular weight and Acid Value closely match a 55:45 Caprylic-Capric Acid blend (~156–158 g/mol, AV ~356–362 mg KOH/g). While both compete in POE lubricants, metalworking coolants, and contact herbicides, Caprylic-Capric Acid is 100% natural even-carbon vegetable derived, offers a lower eutectic freezing point (0–10 °C), and is approved for Food Grade (E570 / FCC), Pharmaceutical (Ph. Eur. / USP-NF), and natural Cosmetic MCT oils and emollients.

CAPRYLIC-CAPRIC ACID AND 2-ETHYLHEXANOIC ACID (BRANCHED C8 ISOMER)

2-Ethylhexanoic Acid (2-EHA, C8H16O2, CAS No. 149-57-5, MW 144.21 g/mol, Acid Value 389.0 mg KOH/g) is a petrochemical branched C8 acid that carries reproductive/developmental toxicity hazard classifications restricting its use in regulated and consumer markets. Linear vegetable-derived Caprylic-Capric Acid (CAS 68937-75-7) is widely selected to replace 2-EHA in 2-EHA-free metalworking fluids, liquid Ca/Zn PVC heat stabilizers, alkyd resins, and polyol esters.

CAPRYLIC-CAPRIC ACID AND DISTILLED TOPPED COCONUT FATTY ACID (C8-C18)

Topped Coconut Fatty Acid (CAS No. 61788-47-4, C8–C18, melting point ~24–28 °C, Acid Value ~265–275 mg KOH/g) contains ~48% C12 lauric acid, ~18% C14 myristic acid, and ~8%–10% C18 stearic/oleic acids alongside 8%–12% C8+C10. Caprylic-Capric Acid (CAS 68937-75-7) is the isolated C8–C10 medium-chain distillate completely separated from C12–C18 long-chain soaps and unsaturated oleic acid.

CAPRYLIC-CAPRIC ACID AND CAPRYLIC/CAPRIC TRIGLYCERIDE (MCT OIL)

Caprylic/Capric Triglyceride (MCT Oil, CAS No. 73398-61-5 or 65381-09-1) is the neutral, non-corrosive glycerin triester manufactured by esterifying Caprylic-Capric Acid with glycerol. Free Caprylic-Capric Acid (CAS 68937-75-7) is a corrosive carboxylic acid (Acid Value ~354–370 mg KOH/g) and must never be used as a direct consumer substitute for neutral MCT Oil (Acid Value <= 0.2 mg KOH/g).

QUALITY GRADES, QUALITY CONTROL AND PURCHASING CRITERIA FOR CAPRYLIC-CAPRIC ACID

Caprylic-Capric Acid is supplied in four main commercial quality tiers:
- Technical / Industrial Fractional Grade (Standard C8-C10 Cut): Typically 50%–65% C8 and 35%–48% C10 (C6 <= 0.5%–1.0%, C12 <= 1.0%–1.5%), Acid Value 354–370 mg KOH/g, Iodine Value <= 1.0 g I2/100 g, Color <= 50–80 APHA. Used for synthetic POE lubricants, metalworking corrosion inhibitors, alkyd resins, liquid PVC stabilizers, mineral flotation, and agricultural herbicides.
- Refined / Low-Odor Cosmetic Grade: Distilled from 100% vegetable coconut or palm kernel oil with C6 caproic acid <= 0.3%–0.5% max, C12 lauric acid <= 0.5%–1.0% max, water-white color (<= 25–30 APHA), Iodine Value <= 0.5 g I2/100 g, and full cosmetic documentation (INCI, heavy metals, vegan, Non-GMO, and optional RSPO Mass Balance or Segregated certification).
- Food and Nutritional Grade (EU E570 / US FDA 21 CFR 172.860 / FCC Compliant): Produced under FSSC 22000 / HACCP food-safety controls for nutritional C8/C10 MCT oil synthesis, food-grade emulsifiers, flavor esters, and E570 processing aids, with verified limits on heavy metals (Pb, As, Hg, Cd), sulfated ash (<= 0.1%), unsaponifiables, and Kosher, Halal, Non-GMO, and Allergen-Free certificates.
- Biocide / Food-Contact Sanitizer Grade: Supplied for formulating regulated no-rinse food-contact CIP sanitizers and agricultural herbicides.
Incoming Quality-Control (QC) Parameters to Verify on Every Shipment:
- Product Name, Manufacturer, and Botanical Origin (coconut vs. palm kernel oil)
- CAS No. 68937-75-7 and EC No. 273-086-2 (plus constituent CAS 124-07-2 and 334-48-5)
- Capillary GC Fatty Acid Chain Distribution (ISO 12966 / AOCS Ce 1h-05): Exact C8 % (e.g., 55%–62%) and C10 % (e.g., 38%–45%), plus C6 max % (<= 0.5%) and C12 max % (<= 1.0%)
- Acid Value (ISO 660, 354–370 mg KOH/g) and Saponification Value (ISO 3657, 355–372 mg KOH/g)
- Iodine Value (ISO 3961 Wijs, <= 0.5 or <= 1.0 g I2/100 g)
- Color (ISO 6271 APHA / Hazen or AOCS Lovibond 5.25-inch cell)
- Moisture Content (ISO 8534 Karl Fischer, <= 0.10%–0.20% w/w) and Titer (ISO 935, 0 to 10 °C)
Always review the Technical Data Sheet (TDS), 16-section Safety Data Sheet (SDS), and lot-specific Certificate of Analysis (COA) together before releasing a batch to production.

STORAGE AND HANDLING OF CAPRYLIC-CAPRIC ACID

Store Caprylic-Capric Acid in tightly closed original high-density polyethylene (HDPE) drums, IBC totes, or insulated AISI 316L stainless steel bulk tanks in a dry, well-ventilated indoor area at 15 to 30 degrees Celsius away from direct sunlight.
While binary eutectic depression lowers its solidification point (titer) to 0 to 10 degrees Celsius—keeping it liquid in cool warehouses (10–15 °C) where pure C8 (16.5 °C) or pure C10 (31.5 °C) would freeze—sub-zero winter transit can cause partial crystallization.
Mandatory Thawing and Homogenization Protocol: If a container cools into its 0 to 10 °C solidification window, higher-melting C10 capric acid crystallizes first and settles toward the bottom while the upper liquid becomes enriched in C8 caprylic acid. Drawing liquid from a partially frozen container alters the C8:C10 ratio and Acid Value. Warm any cloudy or partially crystallized container gently in a warm room or controlled hot box (20 to 35 °C, max 50 °C) until 100 percent clear, and mix thoroughly before sampling or pumping.

SAFETY INFORMATION, PACKAGING AND LOGISTICS FOR CAPRYLIC-CAPRIC ACID

Undiluted Caprylic-Capric Acid (CAS 68937-75-7) is a concentrated organic acid mixture classified under GHS / EU CLP regulations as:
- Skin Corrosion Category 1C (H314: Causes severe skin burns and eye damage)
- Serious Eye Damage Category 1 (H318: Causes serious eye damage)
- Chronic Aquatic Hazard Category 3 (H412: Harmful to aquatic life with long-lasting effects)
Personal Protective Equipment (PPE) and First Aid:
Handle with adequate ventilation, chemical splash goggles (EN 166) plus a full face shield, acid-resistant gauntlets (nitrile >= 0.4 mm, butyl rubber, or fluoroelastomer), and protective clothing. In case of eye or skin contact, flush immediately with plenty of running water for at least 15 to 20 minutes and remove contaminated clothing; if ingested, rinse mouth, do NOT induce vomiting, and obtain immediate medical care. Always consult the current supplier SDS.
Packaging and Dangerous-Goods Transport:
Supplied in ~180–200 kg tight-head HDPE or phenolic-lined steel drums, ~850–950 kg HDPE IBC totes, and heated AISI 316L stainless steel road tankers or ISO tank containers. Transport is regulated under Class 8 Corrosive Substances, UN 3265 (Corrosive liquid, acidic, organic, n.o.s. (Contains Octanoic and Decanoic acids), Packing Group III).

WHAT SHOULD BE CONSIDERED WHEN PURCHASING CAPRYLIC-CAPRIC ACID?

When sourcing Caprylic-Capric Acid, specifying the required C8:C10 weight ratio, impurity limits, and certification tier in the Request for Quotation (RFQ) ensures batch-to-batch process consistency:
- Target Application: Specify whether the material is for MCT oil esterification, cosmetic emollients, synthetic POE lubricants, metalworking coolants, acidic CIP sanitizers, herbicides, or alkyd/PVC applications.
- Required GC C8:C10 Ratio and Impurity Ceilings: State the required C8 % (e.g., 55%–62%) and C10 % (e.g., 38%–45%), plus maximum C6 (<= 0.5% or <= 0.3% for low odor) and C12 (<= 1.0% for low foam).
- Wet-Chemistry Specifications: Specify required Acid Value range (e.g., 356–366 mg KOH/g), Saponification Value, Iodine Value (<= 0.5 or <= 1.0 g I2/100 g), Color (<= 30 or <= 50 APHA), and moisture (<= 0.15%).
- Botanical Origin and Certifications: Indicate if 100% coconut oil, palm kernel oil, RSPO Mass Balance / Segregated, Food Grade / E570 / FCC, Kosher, Halal, Non-GMO, or BSE/TSE-free declarations are required.
- Packaging, Volume, and Documentation: State preferred packaging (drums, IBCs, or bulk ISO tank), order quantity, delivery destination, and required TDS, SDS, and COA documents.
Commercial pricing is driven by global coconut and palm kernel oil markets, C8:C10 fractionation tolerances, certification requirements (RSPO, Food/E570), packaging format, order volume, and Class 8 dangerous-goods freight logistics.

CAPRYLIC-CAPRIC ACID SUPPLY FROM ATAMAN KİMYA

Caprylic-Capric Acid (Fatty acids C8-10, CAS No. 68937-75-7, EC No. 273-086-2) is supplied for Medium-Chain Triglyceride (MCT oil) and cosmetic emollient production, synthetic polyol ester (POE) lubricants, alkanolamine metalworking corrosion inhibitors, low-foam acidic food-contact CIP sanitizers, agricultural contact herbicides, non-yellowing alkyd resins, liquid PVC heat stabilizers, perfumery esters, and dye manufacturing.
Companies planning to source Caprylic-Capric Acid from Ataman Kimya can share their target application and specification requirements to confirm grade suitability, C8:C10 ratio, current stock status, origin, packaging options, and commercial quotation details.
Sharing the following details in a quotation request facilitates technical evaluation:
- Application sector and intended end use
- Required C8:C10 weight ratio (such as 60/40 or 55/45) and GC C6/C12 impurity limits
- Required Acid Value range, Iodine Value limit, APHA/Lovibond color limit, and moisture specification
- Required quality grade and regulatory certifications (Industrial, Cosmetic, Food/E570/FCC, RSPO, Kosher, Halal)
- Estimated order quantity and preferred packaging format (HDPE drums, IBC totes, or bulk ISO tank)
- Required technical documents (TDS, SDS, COA) and incumbent product TDS/COA if evaluating a replacement

FREQUENTLY ASKED QUESTIONS ABOUT CAPRYLIC-CAPRIC ACID

What is Caprylic-Capric Acid?
Caprylic-Capric Acid (also written as Caprylic/Capric Acid, Caprylic Capric Acid, or Fatty acids, C8-10, CAS No. 68937-75-7, EC No. 273-086-2) is a commercial binary mixture of linear saturated eight-carbon caprylic acid (octanoic acid, C8H16O2) and ten-carbon capric acid (decanoic acid, C10H20O2) fractionally distilled from coconut oil or palm kernel oil.

What is the CAS number of Caprylic-Capric Acid?
The chemical inventory and REACH CAS Registry Number for the Caprylic-Capric Acid mixture (Fatty acids, C8-10) is 68937-75-7. Its two individual constituents are Caprylic Acid (CAS 124-07-2) and Capric Acid (CAS 334-48-5).

What is the EC / EINECS number of Caprylic-Capric Acid?
The EC / EINECS number for Caprylic-Capric Acid (Fatty acids, C8-10) is 273-086-2, while its individual components carry EC No. 204-677-5 (octanoic acid) and EC No. 206-376-4 (decanoic acid).

What is the INCI name of Caprylic-Capric Acid?
In cosmetic ingredient labeling, the blend is declared by its constituent INCI names CAPRYLIC ACID and CAPRIC ACID.

What is the typical C8 to C10 ratio in Caprylic-Capric Acid?
Commercial grades typically contain 55% to 62% C8 Caprylic Acid and 38% to 45% C10 Capric Acid by weight (commonly traded as 60/40 or 55/45 C8/C10 blends), with <= 0.5%–1.0% C6 caproic acid and <= 0.5%–1.5% C12 lauric acid.

Why do some chemical databases list C9H18O2 and 158.24 g/mol for CAS 68937-75-7?
Electronic databases often index CAS 68937-75-7 using the mathematical average between C8H16O2 (144.21 g/mol) and C10H20O2 (172.26 g/mol), which equals C9H18O2 (158.24 g/mol). Chemically, natural Caprylic-Capric Acid contains even-carbon C8 and C10 chains and contains no nine-carbon pelargonic acid.

Is Caprylic-Capric Acid the same as Caprylic/Capric Triglyceride (MCT Oil)?
No. Caprylic-Capric Acid (CAS 68937-75-7) is a corrosive mixture of free, unesterified carboxylic acids (Acid Value ~354–370 mg KOH/g). Caprylic/Capric Triglyceride (MCT Oil, CAS 73398-61-5) is the neutral, non-irritating glycerin triester (Acid Value <= 0.2 mg KOH/g) manufactured by esterifying Caprylic-Capric Acid with glycerol.

Why does Caprylic-Capric Acid have a lower freezing point than pure Caprylic Acid or pure Capric Acid?
Pure Caprylic Acid freezes at ~16.5 °C and pure Capric Acid freezes at ~31.5 °C, but mixing the C8 and C10 chains disrupts crystal lattice packing (eutectic depression), lowering the solidification point (titer) of Caprylic-Capric Acid to approximately 0 to 10 °C.

What is the Acid Value of Caprylic-Capric Acid?
Commercial Caprylic-Capric Acid typically has an Acid Value between 354 and 370 mg KOH/g (most commonly 358 to 365 mg KOH/g), proportional to the exact C8 (389.0 mg KOH/g) to C10 (325.7 mg KOH/g) weight ratio.

How do I calculate reactor stoichiometry from the batch Acid Value of Caprylic-Capric Acid?
Divide the molecular weight of KOH (56,105.6 mg/mol) by the batch COA Acid Value (in mg KOH/g) to obtain the exact equivalent weight in grams per mole of carboxyl groups (for example, AV 361.0 mg KOH/g gives 155.42 g/mol).

What is the Saponification Value of Caprylic-Capric Acid?
The Saponification Value typically ranges from 355 to 372 mg KOH/g and should match the batch Acid Value within 0.5 to 2.0 mg KOH/g, confirming absence of unsplit neutral triglycerides or methyl esters.

What is the Iodine Value of Caprylic-Capric Acid?
Because both C8:0 and C10:0 fatty acids are completely saturated with zero double bonds, the theoretical Iodine Value is 0.0 g I2/100 g, and commercial specifications typically set a maximum limit of <= 0.5 or <= 1.0 g I2/100 g.

Is Caprylic-Capric Acid soluble in water?
In its acidic protonated form, Caprylic-Capric Acid is sparingly soluble in water (~0.20 to 0.50 g/L at 20 °C). It is freely miscible with alcohols, glycols, esters, and oils, and dissolves in alkaline water (pH > 7.5) by forming octanoate and decanoate soap salts.

What is the pKa of Caprylic-Capric Acid and why does pH matter?
Both C8 and C10 fatty acids share a pKa near 4.89–4.90 at 25 °C. Below pH 4.0, they remain uncharged lipophilic monomers that penetrate microbial membranes and plant cuticles; above pH 7.5, they convert into water-soluble anionic octanoate and decanoate carboxylate salts.

How is Caprylic-Capric Acid produced commercially?
It is produced by high-pressure steam hydrolysis (splitting) of coconut oil or palm kernel oil at 240–260 °C and 45–60 bar, followed by vacuum fractional distillation where low-boiling C6 caproic acid is topped off first and the combined C8–C10 cut is distilled overhead prior to C12 lauric acid.

What is Caprylic-Capric Acid used for?
It is used to manufacture Medium-Chain Triglycerides (MCT oil), cosmetic emollient esters, synthetic polyol ester (POE) lubricants, alkanolamine metalworking corrosion inhibitors, low-foam acidic food-contact CIP sanitizers, agricultural contact herbicides, non-yellowing short-oil alkyd resins, liquid PVC heat stabilizers, perfumery esters, and dye intermediates.

When should I choose Caprylic-Capric Acid instead of pure Caprylic Acid (CAS 124-07-2)?
Choose Caprylic-Capric Acid (CAS 68937-75-7) for manufacturing mixed C8/C10 esters (standard MCT oil, coco-caprylate/caprate, or POE lubricants), herbicides, or soaps where a lower freezing point (0–10 °C) and lower raw-material cost are advantageous. Choose pure Caprylic Acid (CAS 124-07-2) for biopharmaceutical plasma IgG fractionation, pure C8 tricaprylin MCT oil, single-component flavor esters, or very hard-water coolants.

Why must partially frozen drums of Caprylic-Capric Acid be completely melted and mixed before use?
When cooled into its 0 to 10 °C solidification window, higher-melting C10 capric acid crystallizes first and settles toward the bottom while the upper liquid becomes enriched in C8 caprylic acid. Warming gently (20–35 °C) until completely clear and mixing restores the original C8:C10 ratio and Acid Value.

Why are C6 caproic acid and C12 lauric acid impurity limits important?
Keeping C6 caproic acid <= 0.5% (or <= 0.3% in cosmetic grades) prevents sharp goat-like malodor and low flash points; keeping C12 lauric acid <= 1.0% prevents foaming in CIP sanitizers and high-pressure coolants and avoids hard-water calcium laurate precipitation.

How does Caprylic-Capric Acid work in low-foam food-contact CIP sanitizers?
At acidic pH (< 3.5–4.0), uncharged C8 and C10 fatty acid molecules penetrate bacterial and fungal cell membranes synergistically and dissociate inside the neutral cytoplasm, collapsing intracellular pH without generating foam in CIP spray balls.

How is Caprylic-Capric Acid used in metalworking fluids?
Neutralized with alkanolamines (MEA, TEA, DGA, AMP) at pH 8.5–9.8, it forms low-foaming amine caprylate/caprate corrosion inhibitors that passivate cast iron and steel against flash rust.

Why is Caprylic-Capric Acid used in synthetic polyol ester (POE) lubricants?
Reacting Caprylic-Capric Acid with hindered polyols (NPG, TMP, or pentaerythritol) yields saturated mixed-chain esters with low viscosity, pour points below -40 °C, high flash points, and full miscibility with HFC and HFO refrigerants.

How does Caprylic-Capric Acid function as an agricultural contact herbicide?
Sprayed as an emulsifiable concentrate or potassium/ammonium soap dilution, the C8 and C10 chains dissolve waxy plant cuticles and disrupt epidermal cell membranes, desiccating weeds within hours and biodegrading rapidly in soil without persistent residues.

Is Caprylic-Capric Acid used in cosmetics and personal care?
Yes. It is the primary acyl feedstock for Caprylic/Capric Triglyceride, Coco-Caprylate/Caprate, Glyceryl Caprylate/Caprate, and PEG-6/PEG-8 Caprylic/Capric Glycerides, and is used directly in liquid soap bases and pH-buffered cleansers.

Is Caprylic-Capric Acid used in food and nutritional applications?
Yes, when supplied in a verified Food Grade / EU E570 / FCC compliant grade, where it is used to manufacture nutritional C8/C10 MCT oil, food-grade emulsifiers, pan-release glazes, flavor esters, E570 processing aids, and no-rinse food-contact surface sanitizers.

Can Caprylic-Capric Acid replace Pelargonic Acid (C9) in industrial formulations?
Yes. A 55:45 or 60:40 Caprylic-Capric Acid blend matches the average molecular weight (~156–158 g/mol) and Acid Value (~356–362 mg KOH/g) of C9 Pelargonic Acid in POE lubricants, metalworking coolants, and contact herbicides while providing 100% natural even-carbon vegetable origin and a lower eutectic freezing point.

Can Caprylic-Capric Acid replace branched 2-Ethylhexanoic Acid (2-EHA)?
Yes. Linear Caprylic-Capric Acid is widely used to replace petrochemical 2-ethylhexanoic acid in 2-EHA-free metalworking fluids, liquid Ca/Zn PVC heat stabilizers, and alkyd resins.

Does neat Caprylic-Capric Acid corrode carbon steel or copper?
Yes. Undiluted Caprylic-Capric Acid corrodes carbon steel, cast iron, copper, brass, bronze, and zinc, causing iron or copper discoloration. Store and handle in AISI 316L (or 304) stainless steel, HDPE, polypropylene, or PTFE-lined equipment.

Which gasket and hose materials are compatible with Caprylic-Capric Acid?
PTFE, FFKM (perfluoroelastomer), and chemical-grade HDPE or 316L stainless steel hoses are suitable for neat Caprylic-Capric Acid. Avoid natural rubber, SBR, neoprene, polyurethane, and flexible PVC.

CAPRYLIC-CAPRIC ACID – TECHNICAL SUMMARY

Caprylic-Capric Acid, known in Turkish as Kaprilik-Kaprik Asit or C8-C10 Yağ Asidi and registered under CAS No. 68937-75-7 and EC / EINECS No. 273-086-2 (Fatty acids, C8-10), is a binary saturated medium-chain monocarboxylic fatty acid blend composed of linear eight-carbon caprylic acid (octanoic acid, C8H16O2, CAS 124-07-2) and ten-carbon capric acid (decanoic acid, C10H20O2, CAS 334-48-5). Produced by high-pressure steam hydrolysis and vacuum fractional distillation of coconut oil or palm kernel oil, it is supplied in commercial C8:C10 ratios such as 60:40 and 55:45 as a clear, colorless to pale yellowish mobile oily liquid.
Because binary mixing of C8 and C10 chains causes eutectic crystallization depression, Caprylic-Capric Acid remains a pumpable liquid down to 0 to 10 degrees Celsius—significantly below the freezing points of pure Caprylic Acid (~16.5 °C) and pure Capric Acid (~31.5 °C). With an Acid Value of approximately 354 to 370 mg KOH/g, low dynamic viscosity (~7 to 10 mPa·s at 20 °C), pH-responsive amphiphilic partitioning (pKa ~4.89), and zero olefinic unsaturation (C8:0 and C10:0, Iodine Value <= 0.5–1.0 g I2/100 g), it resists oxidative rancidity, thermal yellowing, and gum formation.

It serves as the primary acyl feedstock for nutritional, pharmaceutical, and cosmetic Caprylic/Capric Triglyceride (MCT oil), cosmetic mono-/diester emollients and micellar solubilizers, and synthetic polyol ester (POE) refrigeration and aviation turbine lubricants, while functioning directly in alkanolamine metalworking corrosion inhibitors, low-foam acidic food-contact CIP sanitizers, agricultural contact herbicides, non-yellowing short-oil baking alkyd resins, liquid Ca/Zn and Ba/Zn PVC heat stabilizers, perfumery esters, and dye manufacturing.
Buyers sourcing Caprylic-Capric Acid from Ataman Kimya are advised to specify their target application, required GC C8:C10 weight ratio and C6/C12 impurity ceilings, Acid Value range, APHA/Lovibond color and moisture limits, regulatory and sustainability certifications (Food/E570/FCC, Cosmetic, RSPO, Kosher, Halal), packaging preference (HDPE drums, IBC totes, or heated bulk ISO tanks), and order quantity to confirm current availability and quotation details.

Ataman Chemicals
Phone: +90 216 577 10 10
Email: info@atamankimya.com