SODIUM 2-METHYLNAPHTHALENE-1-SULFONATE

Sodium 2-methylnaphthalene-1-sulfonate is used primarily as an intermediate and functional additive in various industrial and chemical applications.
Sodium 2-methylnaphthalene-1-sulfonate is commonly employed in the manufacture of dispersants, surfactants, and specialty chemicals, where its aromatic sulfonate structure provides effective wetting and dispersing properties.
In the dye and pigment industry, sodium 2-methylnaphthalene-1-sulfonate is used as a dispersing agent and intermediate in the synthesis of dye auxiliaries.

CAS Number: 827-95-0
EC / EINECS Number: 212-590-6
Molecular Formula: C₁₁H₉NaO₃S
Molecular Weight: Approx. 272.25 g/mol

SYNONYMS:
Sodium methylnaphthalenesulfonate, Sodium methylnaphthalenesulphonate, Methylnaphthalenesulfonic acid, sodium salt, Naphthalenesulfonic acid, methyl-, sodium salt, EINECS 247-564-6, Naphthalenesulfonic acid, methyl-, sodium salt (1:1), RefChem:887693, Sodium methylnapthalenesulfonate, REDI PRO Glass and Counter Cleaner, Naphthalenesulfonic acid, methyl, sodium salt, Sodium mono-and dimethyl naphthalene sulfonate, 247-564-6, 977052-10-0, Sodium 2-methyl-1-naphthalenesulfonate, 26264-58-4, sodium,2-methylnaphthalene-1-sulfonate, 1A0PLS266R, 118218-23-8, 1-Naphthalenesulfonic acid, 2-methyl-, sodium salt (1:1), UNII-1A0PLS266R, SCHEMBL339169, SCHEMBL29446139, sodium methylnaphthalene sulfonate, DTXSID50904100, GCNLRNBDDUYJMP-UHFFFAOYSA-M, NS00084335, Q27252145, methylnaphthalenesulfonic acid, sodium salt, 1- naphthalenesulfonic acid, 2-methyl-, sodium salt (1:1), naphthalenesulfonic acid, methyl-, sodium salt, sodium 2-methylnaphthalene-1-sulfonate, sodium methyl naphthalene sulfonate, sodium methylnaphthalenesulphonate, sodium,2-methylnaphthalene-1-sulfonate, Sodium methylnaphthalenesulfonate, Sodium methylnaphthalenesulphonate, Methylnaphthalenesulfonic acid sodium salt, Naphthalenesulfonic acid methyl-sodium salt, Sodium 2-methylnaphthalene-1-sulfonate, Sodium methyl naphthalene sulfonate, Sodium mono- and dimethyl naphthalene sulfonate, 1-naphthalenesulfonic acid, 2-methyl-sodium salt

Sodium 2-methylnaphthalene-1-sulfonate is an anionic aromatic sulfonate compound that consists of a naphthalene ring substituted with a methyl group and a sulfonate (-SO₃⁻) group, with sodium as the counter-ion.
Structurally, this gives the molecule both a hydrophobic aromatic region (from the naphthalene ring) and a strong hydrophilic ionic sulfonate group, making Sodium 2-methylnaphthalene-1-sulfonate an effective dispersant, wetting agent, and surface-active agent in many industrial applications.

Sodium 2-methylnaphthalene-1-sulfonate is most commonly encountered in industrial formulations rather than consumer products and helps improve dispersion, wetting, and stability in complex systems like dyes, pigments, construction chemicals, agrochemical suspensions, and polymer dispersions.

Sodium 2-methylnaphthalene-1-sulfonate belongs to a broader class of naphthalene sulfonate derivatives, which are well known in industrial chemistry for their ability to modify interfacial phenomena rather than act as conventional detergents.
The presence of a rigid, fused aromatic naphthalene ring system gives Sodium 2-methylnaphthalene-1-sulfonate a strong hydrophobic character, while the sulfonate group introduces permanent ionic charge.

This combination results in a molecule that does not primarily rely on micelle formation like long-chain alkyl surfactants, but instead operates effectively at solid–liquid and liquid–liquid interfaces.
One of the defining characteristics of sodium 2-methylnaphthalene-1-sulfonate is its high dispersing efficiency at relatively low dosage.

In aqueous systems containing finely divided solids, such as pigments, mineral fillers, or agrochemical actives, Sodium 2-methylnaphthalene-1-sulfonate adsorbs onto particle surfaces.
The sulfonate group creates strong electrostatic repulsion between particles, while the aromatic structure anchors the molecule firmly to hydrophobic or partially hydrophobic surfaces.

This dual interaction significantly reduces particle agglomeration and sedimentation over time.
In formulation chemistry, sodium 2-methylnaphthalene-1-sulfonate is often valued for its low sensitivity to electrolytes.
Unlike some surfactants that lose effectiveness in the presence of salts, calcium, or other multivalent ions, aromatic sulfonates tend to maintain performance across a wide ionic strength range.

This makes Sodium 2-methylnaphthalene-1-sulfonate particularly suitable for applications such as construction chemicals, where cementitious systems contain high concentrations of dissolved salts and alkaline species.
Environmental behavior of sodium 2-methylnaphthalene-1-sulfonate is influenced by its aromatic structure.

While Sodium 2-methylnaphthalene-1-sulfonate is readily soluble in water, its biodegradation profile is typically slower than that of linear fatty-based surfactants.

Nevertheless, aromatic sulfonates are widely regulated and assessed under chemical safety frameworks, and their use is generally accepted in industrial contexts when properly managed.
Environmental exposure is minimized through controlled formulation use and appropriate wastewater treatment.
Sodium 2-methylnaphthalene-1-sulfonate can be best described as a functional performance additive rather than a consumer surfactant.

USES and APPLICATIONS of SODIUM 2-METHYLNAPHTHALENE-1-SULFONATE:
Sodium 2-methylnaphthalene-1-sulfonate is employed primarily in industrial and technical sectors.
Construction Chemicals: Sodium 2-methylnaphthalene-1-sulfonate is used in cement, concrete, gypsum, and mortar formulations to disperse mineral particles, improving workability, consistency, and pumpability.

Textile Processing: Sodium 2-methylnaphthalene-1-sulfonate functions as a processing aid in dyeing and printing auxiliaries, facilitating even penetration of dyes into fibers.
Agrochemical Formulations: Sodium 2-methylnaphthalene-1-sulfonate is used in suspension concentrates and wettable powders to help disperse agrichemical particles and stabilize formulations.

Polymer & Latex Dispersions: Sodium 2-methylnaphthalene-1-sulfonate stabilizes polymer particle dispersions in water-based systems, improving distribution and storage stability.
Specialty Chemical Processes: Sodium 2-methylnaphthalene-1-sulfonate serves as a process aid in industrial formulations requiring controlled surface activity, wetting, or dispersion without high foaming.

Sodium 2-methylnaphthalene-1-sulfonate also demonstrates excellent thermal stability, largely due to the aromatic naphthalene backbone.
This stability allows Sodium 2-methylnaphthalene-1-sulfonate to function effectively in processes involving elevated temperatures, such as cement hydration, pigment dispersion under heat, or industrial dye baths.

The sulfonate group itself is resistant to hydrolysis, meaning that the molecule retains Sodium 2-methylnaphthalene-1-sulfonate's functionality across a broad pH range, from mildly acidic to strongly alkaline environments.
From a formulation design perspective, sodium 2-methylnaphthalene-1-sulfonate is often used as a secondary or auxiliary additive rather than the primary surfactant.

Sodium 2-methylnaphthalene-1-sulfonate is commonly combined with non-ionic surfactants, polymeric dispersants, or lignosulfonates to fine-tune dispersion quality, reduce viscosity, or improve long-term storage stability.
In such systems, Sodium 2-methylnaphthalene-1-sulfonate contributes to faster wetting of powders, more uniform particle distribution, and improved reproducibility between batches.

In comparison with aliphatic sulfonates or sulfate surfactants, sodium 2-methylnaphthalene-1-sulfonate generally produces very little foam.
This low-foaming behavior of  is a significant advantage in industrial processes where foam can interfere with mixing, pumping, or coating operations.

As a result, it is favored in applications such as industrial washing, concrete admixtures, and agrochemical suspensions, where controlled surface activity is more important than detergency or foaming power.
Sodium 2-methylnaphthalene-1-sulfonate is used primarily as an intermediate and functional additive in various industrial and chemical applications.

Sodium 2-methylnaphthalene-1-sulfonate is commonly employed in the manufacture of dispersants, surfactants, and specialty chemicals, where its aromatic sulfonate structure provides effective wetting and dispersing properties.
In the dye and pigment industry, sodium 2-methylnaphthalene-1-sulfonate is used as a dispersing agent and intermediate in the synthesis of dye auxiliaries.

Sodium 2-methylnaphthalene-1-sulfonate helps improve pigment dispersion, color uniformity, and stability in aqueous systems, supporting consistent performance in textile dyeing and printing processes.
Sodium 2-methylnaphthalene-1-sulfonate is also utilized in the production of concrete admixtures and construction chemicals, where it contributes to improved dispersion of cement particles and enhanced workability of cement-based formulations.

In the agrochemical sector, sodium 2-methylnaphthalene-1-sulfonate can be used as a dispersing or wetting agent in pesticide and herbicide formulations, helping to ensure uniform distribution of active ingredients and improved formulation stability.
Additionally, Sodium 2-methylnaphthalene-1-sulfonate finds application in leather processing, paper manufacturing, and oilfield chemicals, where its sulfonate functionality aids in dispersion, emulsification, and process efficiency across a range of industrial systems.

Sodium 2-methylnaphthalene-1-sulfonate's primary value lies in its ability to control particle behavior, stabilize dispersions, and enhance wetting efficiency in complex industrial systems.
Sodium 2-methylnaphthalene-1-sulfonate’s balance of aromatic hydrophobicity, strong ionic character, thermal robustness, and low foaming profile makes it a reliable tool in formulation science, especially in demanding environments where conventional surfactants fail to perform consistently.

-Dyes and Pigments:
Sodium 2-methylnaphthalene-1-sulfonate acts as a dispersant and wetting agent to improve the uniform distribution of pigments and dyes.
Sodium 2-methylnaphthalene-1-sulfonate enhances color consistency and prevents clumping.

BENEFITS & CHARACTERISTICS of SODIUM 2-METHYLNAPHTHALENE-1-SULFONATE:
Sodium 2-methylnaphthalene-1-sulfonate offers several practical benefits in industrial systems:
Effective dispersion of particulate materials.

Enhanced wetting performance for solids and powders.
Sodium 2-methylnaphthalene-1-sulfonate improves formulation uniformity and stability.

Low foam compared to surfactants used in consumer detergents.
Resistant to breakdown under moderate heat and process conditions.

Sodium 2-methylnaphthalene-1-sulfonate is compatible with many non-ionic surfactants and solvents (depending on system).
Because Sodium 2-methylnaphthalene-1-sulfonate has an aromatic structure and a strong ionic group, it is more potent as a functional auxiliary agent (like a dispersant) than as a typical cleaning surfactant.

FUNCTIONAL PROPERTIES AND BEHAVIOR of SODIUM 2-METHYLNAPHTHALENE-1-SULFONATE:
Sodium 2-methylnaphthalene-1-sulfonate is valued for its amphiphilic character (hydrophobic aromatic portion + hydrophilic sulfonate), which gives it:

Surface & Dispersion Properties
*Wetting Agent: 
Sodium 2-methylnaphthalene-1-sulfonate enhances the ability of liquids to spread over solid surfaces.

*Dispersing Agent: 
Sodium 2-methylnaphthalene-1-sulfonate prevents particle agglomeration, keeps solids evenly distributed in liquid media.

*Low Foaming: 
Unlike many detergents, Sodium 2-methylnaphthalene-1-sulfonate does not produce excessive foam, useful in industrial processes where foaming is undesirable.

*Stabilizer: 
Sodium 2-methylnaphthalene-1-sulfonate promotes uniform suspensions and dispersion stability over time.

These surface-active characteristics make Sodium 2-methylnaphthalene-1-sulfonate useful not as a classic detergent (e.g., for personal care) but as a functional auxiliary agent in technical and industrial formulations where particle dispersion, wetting control, and formulation stability are needed.

PHYSICAL and CHEMICAL PROPERTIES of SODIUM 2-METHYLNAPHTHALENE-1-SULFONATE:
Name: Sodium 2-methylnaphthalene-1-sulfonate
CAS Number: 827-95-0
EC / EINECS Number: 212-590-6
Molecular Formula: C₁₁H₉NaO₃S
Molecular Weight: Approx. 272.25 g/mol
IUPAC Name: Sodium 2-methylnaphthalene-1-sulfonate
Chemical Type: Anionic aromatic sulfonate salt
Physical Form: White to off-white crystalline solid

State at Room Temperature: Solid powder or crystalline appearance with little to no odor
Appearance: Free-flowing white to off-white solid or crystalline powder
Odor: Typically odorless or very faintly characteristic
Solubility: Readily soluble in water owing to the ionic sulfonate group; insoluble or poorly soluble in non-polar organic solvents
pH in Aqueous Solution: Generally neutral to slightly alkaline (dependent on concentration)
Ionic Character: Strong anionic surfactant behavior

Thermal & Chemical Stability: Relatively stable under typical storage and handling conditions; the rigid naphthalene ring contributes thermal stability, and the sulfonate group resists hydrolysis even under moderate conditions
Molecular Weight: 244.24 g/mol
Hydrogen Bond Donor Count: 0
Hydrogen Bond Acceptor Count: 3
Rotatable Bond Count: 1
Exact Mass: 244.01700960 Da
Monoisotopic Mass: 244.01700960 Da

Topological Polar Surface Area: 65.6 Ų
Heavy Atom Count: 16
Formal Charge: 0
Complexity: 323
Isotope Atom Count: 0
Defined Atom Stereocenter Count: 0
Undefined Atom Stereocenter Count: 0
Defined Bond Stereocenter Count: 0

Undefined Bond Stereocenter Count: 0
Covalently-Bonded Unit Count: 2
Compound Is Canonicalized: Yes
CAS Number: 26264-58-4
Other(deleted CASRN): 127670-54-6
ECHA EINECS - REACH Pre-Reg: 247-564-6
FDA UNII: 1A0PLS266R

Nikkaji Web: J178.664D
Molecular Weight: 244.24509928
Formula: C11 H9 Na O3 S
Assay: 95.00 to 100.00
Food Chemicals Codex Listed: No
Flash Point: 32.00 °F. TCC (0.00 °C.) (est)
logP (o/w): 2.161 (est)

Soluble in: water, 2.851e+005 mg/L @ 25 °C (est)
IUPAC Name: sodium;2-methylnaphthalene-1-sulfonate
InChI: InChI=1/C11H10O3S.Na/c1-8-6-7-9-4-2-3-5-10(9)11(8)15(12,13)14;/h2-7H,1H3,(H,12,13,14);/q;+1/p-1
Std.InChI: InChI=1S/C11H10O3S.Na/c1-8-6-7-9-4-2-3-5-10(9)11(8)15(12,13)14;/h2-7H,1H3,(H,12,13,14);/q;+1/p-1
InChIKey: GCNLRNBDDUYJMP-REWHXWOFAQ
Std.InChIKey: GCNLRNBDDUYJMP-UHFFFAOYSA-M
SMILES: [Na+].[O-]S(=O)(=O)c1c2c(ccc1C)cccc2

FIRST AID MEASURES of SODIUM 2-METHYLNAPHTHALENE-1-SULFONATE:
-Description of first-aid measures
*General advice:
Show this material safety data sheet to the doctor in attendance.
*If inhaled:
After inhalation: 
Fresh air.
*In case of skin contact: 
Take off immediately all contaminated clothing. 
Rinse skin with
water/ shower.
*In case of eye contact:
After eye contact: 
Rinse out with plenty of water. 
Call in ophthalmologist. 
Remove contact lenses.
*If swallowed:
After swallowing: 
Immediately make victim drink water (two glasses at most). 
Consult a physician.
-Indication of any immediate medical attention and special treatment needed.
No data available

ACCIDENTAL RELEASE MEASURES of SODIUM 2-METHYLNAPHTHALENE-1-SULFONATE:
-Environmental precautions:
Do not let product enter drains.
-Methods and materials for containment and cleaning up:
Cover drains. 
Collect, bind, and pump off spills. 
Observe possible material restrictions. 
Take up dry. 
Dispose of properly. 
Clean up affected area.

FIRE FIGHTING MEASURES of SODIUM 2-METHYLNAPHTHALENE-1-SULFONATE:
-Extinguishing media:
*Suitable extinguishing media:
Carbon dioxide (CO2) 
Foam 
Dry powder
*Unsuitable extinguishing media:
For this substance/mixture no limitations of extinguishing agents are given.
-Further information:
Prevent fire extinguishing water from contaminating surface water or the ground water system.

EXPOSURE CONTROLS/PERSONAL PROTECTION of SODIUM 2-METHYLNAPHTHALENE-1-SULFONATE:
-Control parameters:
--Ingredients with workplace control parameters:
-Exposure controls:
--Personal protective equipment:
*Eye/face protection:
Use equipment for eye protection. 
Safety glasses
*Body Protection:
protective clothing
*Respiratory protection:
Recommended Filter type: Filter A 
-Control of environmental exposure:
Do not let product enter drains.

HANDLING and STORAGE of SODIUM 2-METHYLNAPHTHALENE-1-SULFONATE:
-Conditions for safe storage, including any incompatibilities:
*Storage conditions:
Tightly closed. 
Dry.

STABILITY and REACTIVITY of SODIUM 2-METHYLNAPHTHALENE-1-SULFONATE:
-Chemical stability:
The product is chemically stable under standard ambient conditions (room temperature).
-Possibility of hazardous reactions:
No data available