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1,2-Benzenedicarboxylic acid, diethyl ester is a low-volatility phthalate ester widely known as diethyl phthalate and commonly abbreviated DEP.
The molecule contains two ethyl ester groups attached to adjacent positions of a benzene ring, producing a clear oily liquid with useful solvency, compatibility, flexibility-modifying, and fragrance-carrier properties.
1,2-Benzenedicarboxylic acid, diethyl ester is used in fragrance and cosmetic systems, specialty plasticization, cellulose-based polymers, coatings, adhesives, sealants, polymer films, pharmaceutical coating technologies, analytical applications, and other formulations requiring a relatively low-molecular-weight phthalate ester.
CHEMICAL IDENTITY AND COMMON NAMES
1,2-Benzenedicarboxylic acid, diethyl ester is the diethyl ester of phthalic acid.
The two ester groups occupy adjacent ortho positions on the aromatic ring, distinguishing the compound from corresponding isophthalate and terephthalate esters.
The common industrial name is diethyl phthalate and the abbreviation DEP is widely used in plastics, fragrance, cosmetics, coatings, polymer, and analytical industries.
Ethyl phthalate is another established short-form name for the same chemical identity.
1,2-Benzenedicarboxylic acid, diethyl ester should be distinguished from dimethyl phthalate, dibutyl phthalate, diisobutyl phthalate, and bis(2-ethylhexyl) phthalate.
These related phthalate esters differ substantially in molecular weight, volatility, plasticizing efficiency, polymer compatibility, migration behaviour, toxicological profile, and regulatory status.
The material should also be distinguished from diethyl terephthalate and diethyl isophthalate.
Although these compounds contain the same principal functional groups, the positions of the ester substituents on the aromatic ring are different and therefore produce separate chemical identities and physical properties.
Synonyms and Common Names: Diethyl phthalate, DEP, Ethyl phthalate, Phthalic acid diethyl ester, Diethyl ester of phthalic acid, Diethyl benzene-1,2-dicarboxylate, Diethyl 1,2-benzenedicarboxylate, Benzene-1,2-dicarboxylic acid diethyl ester, 1,2-Benzenedicarboxylic acid diethyl ester, 1,2-Benzenedicarboxylic acid, 1,2-diethyl ester, Phthalic acid, diethyl ester, o-Phthalic acid diethyl ester, Diethyl o-phthalate, Diethyl orthophthalate, Diethyl benzene-o-dicarboxylate
TECHNICAL IDENTIFICATION
CAS Number: 84-66-2
EC / EINECS Number: 201-550-6
Molecular Formula: C12H14O4
Molar Mass: 222.24 g/mol
IUPAC Name: Diethyl benzene-1,2-dicarboxylate
Chemical Class: Phthalate ester
Functional Groups: Two ethyl carboxylate ester groups
Common Abbreviation: DEP
PHYSICAL AND CHEMICAL PROPERTIES
Appearance: Colourless to water-white oily liquid
Physical State: Liquid
Odour: Very slight aromatic odour
Molecular Formula: C12H14O4
Molar Mass: 222.24 g/mol
Boiling Point: Approximately 295 °C
Freezing Point: Approximately -41 °C
Specific Gravity: Approximately 1.12
Density: Approximately 1.12 g/cm³ at ambient temperature
Water Solubility: Approximately 1 g/L at 25 °C
Vapour Pressure: Approximately 0.002 mmHg at 25 °C
Flash Point: Approximately 161 °C, open cup
Lower Explosive Limit: Approximately 0.7 vol% at elevated temperature
Volatility: Low under normal ambient conditions
Chemical Character: Neutral aromatic diester
Water Behaviour: Slightly soluble in water
Organic Solvent Behaviour: Compatible with many alcohols, ketones, ethers, esters, aromatic hydrocarbons, and other organic media
Hydrolysis Behaviour: Ester groups can undergo hydrolysis under sufficiently strong acidic, alkaline, enzymatic, or prolonged aqueous conditions
Combustibility: Combustible at sufficiently elevated temperature
Incompatibilities: Strong oxidizing agents and strongly reactive acidic or alkaline conditions
The relatively high boiling point and extremely low vapour pressure of 1,2-Benzenedicarboxylic acid, diethyl ester provide low volatility compared with many conventional organic solvents.
This property is valuable when the material is used as a fragrance carrier, plasticizer, coating component, or processing aid where rapid evaporation is undesirable.
The liquid remains fluid well below normal room temperature because of its low freezing point.
This provides practical advantages for pumping, metering, storage, and formulation across a broad range of normal industrial temperatures.
1,2-Benzenedicarboxylic acid, diethyl ester is denser than water but has only limited aqueous solubility.
Its substantially greater compatibility with organic phases makes it useful in resin, fragrance, oil, solvent, and polymer formulations.
The two ester groups provide moderate molecular polarity while the aromatic ring contributes compatibility with numerous hydrophobic organic materials.
This balance between polar and nonpolar structural features explains much of the solvency and plasticization behaviour of 1,2-Benzenedicarboxylic acid, diethyl ester.
FUNCTIONAL CHARACTERISTICS
1,2-Benzenedicarboxylic acid, diethyl ester functions as a relatively low-molecular-weight plasticizer, solvent, carrier, fixative, diluent, and formulation aid depending on the application.
Its liquid state and low volatility permit it to remain within many formulations after more volatile solvents have evaporated.
As a plasticizer, 1,2-Benzenedicarboxylic acid, diethyl ester positions itself between polymer chains and reduces intermolecular interactions.
This increases chain mobility and can lower hardness, reduce brittleness, improve flexibility, and modify processing characteristics.
Its relatively small molecular size provides useful solvating power for selected cellulose derivatives and resins.
This characteristic has supported long-established use with cellulose acetate, cellulose nitrate, and related coating or plastics technologies.
In fragrance systems, 1,2-Benzenedicarboxylic acid, diethyl ester functions primarily as a solvent and carrier.
Its low odour, low volatility, and compatibility with many fragrance materials allow perfume ingredients to be dissolved and distributed without contributing a dominant fragrance note of its own.
The low evaporation rate also supports a fixative function.
By remaining in a fragrance composition after more volatile components begin to evaporate, 1,2-Benzenedicarboxylic acid, diethyl ester can influence fragrance release and help maintain a more persistent formulation profile.
PRODUCTION AND COMMERCIAL FORM
1,2-Benzenedicarboxylic acid, diethyl ester is produced industrially by esterification of phthalic anhydride or phthalic acid with ethanol.
The reaction converts the two carboxylic acid functionalities into ethyl ester groups while producing water as a reaction coproduct.
Acid-catalysed esterification can be conducted under conditions designed to drive the equilibrium toward formation of the diester.
Removal of water and control of ethanol concentration support efficient conversion.
Phthalic anhydride is particularly suitable as an industrial feedstock because it reacts readily with alcohols and is widely available from oxidation-based aromatic chemical processes.
The first alcohol addition opens the anhydride ring and subsequent esterification forms the second ethyl ester.
Crude reaction material is purified to remove residual ethanol, water, acidic components, monoester intermediates, unreacted phthalic material, catalyst residues, and other process-related impurities.
Neutralization, washing, vacuum stripping, distillation, filtration, and polishing treatments can be combined according to the required grade.
Commercial 1,2-Benzenedicarboxylic acid, diethyl ester is normally supplied as a clear colourless liquid.
Purity, colour, acidity, water content, density, refractive properties, and selected ester-related impurities can be important commercial specification parameters.
FRAGRANCE SOLVENT
1,2-Benzenedicarboxylic acid, diethyl ester is an established solvent and carrier for fragrance compositions.
Its combination of low odour, low volatility, liquid form, and compatibility with many aromatic ingredients allows it to dissolve and distribute fragrance materials efficiently.
Perfume concentrates can contain ingredients spanning a broad range of polarity and volatility.
1,2-Benzenedicarboxylic acid, diethyl ester provides an organic medium capable of supporting many of these materials without evaporating as rapidly as ethanol or other volatile carriers.
The relatively neutral odour profile is particularly important in fragrance applications.
A carrier should not dominate or distort the intended perfume composition.
The solvent function also assists accurate dosing and blending of fragrance components that are difficult to handle in concentrated or crystalline form.
Predissolution can improve uniformity during incorporation into finished formulations.
FRAGRANCE FIXATIVE
1,2-Benzenedicarboxylic acid, diethyl ester is widely recognized for its fixative function in fragrance chemistry.
Low volatility allows it to remain within the fragrance matrix while top-note materials evaporate more rapidly.
This persistence can help moderate the release rate of selected fragrance ingredients.
The result can be a smoother transition between more volatile and less volatile components within a perfume profile.
1,2-Benzenedicarboxylic acid, diethyl ester is especially useful when a formulation requires a carrier that combines solvency with a relatively slow evaporation rate.
The precise effect depends on the complete fragrance composition and the physicochemical properties of the individual perfume ingredients.
PERFUME AND EAU-DE-TOILETTE FORMULATIONS
1,2-Benzenedicarboxylic acid, diethyl ester is used as a fragrance solvent in perfume and related personal-fragrance formulations.
It can function alongside ethanol, water, fragrance concentrates, and other formulation ingredients.
The material assists dissolution of less volatile fragrance components and can contribute to consistent fragrance distribution throughout the liquid phase.
Its low vapour pressure also prevents it from competing strongly with the rapid evaporation of alcohol.
Formulation level depends on fragrance composition, desired evaporation profile, solubility requirements, regional regulatory conditions, and product design.
Cosmetic and fragrance grades require careful control of odour, colour, purity, and impurities.
COSMETICS AND PERSONAL CARE
1,2-Benzenedicarboxylic acid, diethyl ester is used in cosmetics primarily as a solvent, fragrance carrier, and formulation aid.
Its established cosmetic relevance is closely associated with fragranced personal-care products rather than with its role as a high-efficiency plastics plasticizer.
Applications can include perfumes, aftershave products, lotions, hair products, deodorizing preparations, cleansers, and other fragranced cosmetic systems.
The exact function depends on whether the material is introduced directly or enters the final product through a fragrance composition.
Low colour and low intrinsic odour are particularly important for cosmetic-grade material.
A strongly coloured or odorous impurity profile could interfere with the sensory characteristics of the finished formulation.
FRAGRANCE RAW-MATERIAL DILUTION
1,2-Benzenedicarboxylic acid, diethyl ester can be used to dilute powerful fragrance ingredients before incorporation into a complete perfume formula.
This improves weighing accuracy and helps prevent highly concentrated aromatic materials from producing localized formulation differences.
Dilution is particularly useful when an ingredient has a very strong odour contribution or when only a small quantity is required.
A stable carrier allows the perfumer or formulator to work with a lower-concentration intermediate that can be measured more accurately.
The low volatility of 1,2-Benzenedicarboxylic acid, diethyl ester reduces concentration changes during storage compared with highly volatile diluents.
This is beneficial when fragrance intermediates must maintain consistent composition.
ALCOHOL DENATURANT
1,2-Benzenedicarboxylic acid, diethyl ester has established use as a denaturing component for ethanol in selected fragrance and cosmetic alcohol systems.
The presence of a denaturant makes ethanol unsuitable for beverage use while retaining its utility as a formulation solvent.
This application is closely linked with perfumery because ethanol is one of the principal volatile carriers used in fragrance products.
1,2-Benzenedicarboxylic acid, diethyl ester can therefore provide both formulation and alcohol-denaturing functions within appropriate systems.
Denatured-alcohol formulations are jurisdiction-specific.
The permitted denaturant system and required concentrations depend on the applicable legal and excise framework.
SPECIALTY PLASTICIZER
1,2-Benzenedicarboxylic acid, diethyl ester functions as a plasticizer in selected polymer systems.
The liquid ester increases molecular mobility within compatible polymer matrices and thereby modifies flexibility and mechanical behaviour.
Its comparatively low molecular weight gives 1,2-Benzenedicarboxylic acid, diethyl ester stronger solvating character but greater migration and volatility than many higher-molecular-weight phthalate plasticizers.
It is therefore most valuable where this balance of solvency, flexibility, and processability is appropriate.
The material has historically been used in plastic films, molded products, flexible coatings, and specialty polymer formulations.
Modern grade selection depends strongly on polymer compatibility, migration requirements, intended service temperature, and applicable regulatory restrictions.
CELLULOSE ACETATE PLASTICIZATION
1,2-Benzenedicarboxylic acid, diethyl ester has established compatibility with cellulose acetate.
It can soften the polymer, reduce brittleness, improve flexibility, and modify processing behaviour.
Cellulose acetate is used in films, coatings, molded materials, fibres, and specialty fabricated products.
Plasticizer concentration determines the balance between hardness, flexibility, dimensional stability, and processing characteristics.
The relatively good solvating interaction between 1,2-Benzenedicarboxylic acid, diethyl ester and cellulose-based ester polymers supports homogeneous incorporation.
Uniform plasticizer distribution is important for avoiding variations in transparency and mechanical properties.
CELLULOSE NITRATE AND NITROCELLULOSE SYSTEMS
1,2-Benzenedicarboxylic acid, diethyl ester has long-standing use as a plasticizer and solvent-assisting component for nitrocellulose formulations.
It reduces brittleness of dried nitrocellulose films and improves flexibility.
Nitrocellulose is used in lacquers, coatings, printing-related systems, inks, and specialty resin compositions.
A compatible plasticizer helps prevent hard films from cracking under deformation.
1,2-Benzenedicarboxylic acid, diethyl ester can remain in the film after volatile solvents evaporate.
This distinguishes its plasticizing function from the temporary solvency provided by rapidly evaporating process solvents.
LACQUERS
1,2-Benzenedicarboxylic acid, diethyl ester is used in selected lacquer systems, particularly those based on nitrocellulose and other compatible resins.
Its role combines film plasticization with formulation solvency.
In a lacquer, volatile solvents provide application viscosity and evaporate during drying.
1,2-Benzenedicarboxylic acid, diethyl ester remains substantially within the film and modifies flexibility and resistance to cracking.
The required level depends on resin type, hardness target, substrate flexibility, drying characteristics, and the presence of other plasticizers.
Excessive plasticization can reduce hardness and blocking resistance, so formulation balance is important.
COATINGS
1,2-Benzenedicarboxylic acid, diethyl ester can function as a plasticizing and solvent-modifying component in selected industrial coatings.
Its low volatility allows it to remain in the dried film longer than conventional volatile solvents.
The material can improve film flexibility and reduce brittleness when compatible with the binder.
This is useful where a coating must tolerate bending, impact, or dimensional movement of the substrate.
Compatibility should be evaluated with the complete resin system.
Different acrylic, cellulose, alkyd, vinyl, or other polymer binders interact differently with low-molecular-weight phthalate esters.
PRINTING INKS
1,2-Benzenedicarboxylic acid, diethyl ester can be incorporated into selected printing-ink vehicles as a plasticizer, solvent modifier, or flexibility aid.
It is particularly relevant to ink systems containing cellulose-derived resins.
The material can help keep dried ink films from becoming excessively brittle.
This is useful on flexible substrates that undergo folding, rolling, or mechanical deformation.
Ink applications require attention to migration, drying rate, adhesion, blocking, substrate compatibility, and end-use regulatory requirements.
The contribution of 1,2-Benzenedicarboxylic acid, diethyl ester must therefore be assessed as part of the complete ink formulation.
ADHESIVES
1,2-Benzenedicarboxylic acid, diethyl ester is used in selected adhesive formulations as a plasticizer and compatibility aid.
It can lower the effective glass-transition behaviour of compatible polymer phases and increase flexibility.
A more flexible adhesive film can tolerate movement between bonded substrates and reduce brittle failure.
The actual performance depends on resin chemistry, filler content, tackifier system, solvent package, and service conditions.
Low-molecular-weight plasticizers can also affect tack, open time, cohesive strength, and migration.
The required concentration should therefore balance handling characteristics with long-term bond performance.
SEALANTS AND CAULKING MATERIALS
1,2-Benzenedicarboxylic acid, diethyl ester has been used in flexible sealant and caulking compositions where a compatible liquid plasticizer is required.
The plasticizing effect can improve application consistency and reduce brittleness after curing or drying.
The material can also lower viscosity in suitable formulations.
This facilitates mixing of fillers and application through dispensing equipment.
Long-term suitability depends on polymer affinity and migration resistance.
Sealants exposed to heat, oils, solvents, or porous substrates require particular attention to plasticizer retention.
RUBBER AND ELASTOMER PROCESSING
1,2-Benzenedicarboxylic acid, diethyl ester has been used as a softening or plasticizing component in selected rubber and elastomer formulations.
Its main function is to increase processability and reduce stiffness when compatible with the elastomer phase.
The relatively small molecule can provide effective softening at moderate levels.
However, retention and migration characteristics differ from those of higher-molecular-weight plasticizers.
Selection therefore depends on service temperature, extraction resistance, volatility requirements, and the complete rubber formulation.
Applications requiring very low migration generally favour higher-molecular-weight alternatives.
PLASTIC FILMS
1,2-Benzenedicarboxylic acid, diethyl ester has been incorporated into plastic and polymer films requiring increased flexibility.
The material reduces polymer-polymer attraction and allows greater molecular movement within compatible matrices.
Film applications can require a balance between flexibility, tensile strength, transparency, blocking resistance, and dimensional stability.
Plasticizer loading has a direct influence on these properties.
Low colour is especially important for clear films.
Purity and compatibility help prevent haze, exudation, or undesirable surface changes.
TAPES AND FLEXIBLE POLYMER PRODUCTS
1,2-Benzenedicarboxylic acid, diethyl ester has been used in selected flexible polymer articles and tape-related materials.
Plasticization can modify flexibility, coating behaviour, and adhesion properties.
In pressure-sensitive constructions, interactions among the adhesive polymer, tackifier, backing, and plasticizer determine finished performance.
Migration between adjacent layers must also be considered.
POLYMER PROCESSING
1,2-Benzenedicarboxylic acid, diethyl ester can reduce melt or solution viscosity in compatible polymer systems.
This can improve mixing, flow, coating, extrusion, or casting behaviour.
The effect is related to increased segmental mobility and reduced intermolecular attraction.
Processing improvements should be balanced against the mechanical properties required after cooling or solvent removal.
DYES AND COLORANT PROCESSING
1,2-Benzenedicarboxylic acid, diethyl ester has been used as a carrier, wetting aid, or formulation component in selected dye and colorant systems.
Its organic solvency can assist handling of hydrophobic colorants or other low-water-solubility ingredients.
The low volatility can help maintain a stable liquid phase during extended formulation or application.
Compatibility with the specific dye, binder, substrate, and process medium determines suitability.
The material is not itself a dye.
Its role is associated with formulation, dispersion, transport, or application of the actual colorant.
FRAGRANCED DETERGENT AND HOUSEHOLD SYSTEMS
1,2-Benzenedicarboxylic acid, diethyl ester can enter detergent and household formulations as part of a fragrance composition.
Its primary function in these systems is to carry and stabilize fragrance ingredients rather than to function as the main surfactant or detergent component.
Low volatility can assist persistence of selected perfume components during storage.
Compatibility with the fragrance concentrate is important before incorporation into water-rich finished products.
The final distribution of 1,2-Benzenedicarboxylic acid, diethyl ester depends on surfactants, emulsifiers, oils, and other formulation components.
Hydrophobic interactions can strongly influence its location within multiphase systems.
PHARMACEUTICAL COATING TECHNOLOGY
1,2-Benzenedicarboxylic acid, diethyl ester has established use as a plasticizer in selected pharmaceutical film-coating and enteric-coating technologies.
Plasticization reduces brittleness of polymer coatings and assists formation of continuous flexible films.
Cellulose-derived pharmaceutical coating polymers can require a plasticizer to obtain adequate film integrity.
1,2-Benzenedicarboxylic acid, diethyl ester has historically been used with compatible systems where its solvency and plasticizing behaviour are appropriate.
Plasticizer level influences coating flexibility, permeability, glass-transition behaviour, processing temperature, and mechanical stability.
Pharmaceutical use requires appropriately controlled material quality and compliance with the regulatory requirements of the intended dosage form and jurisdiction.
TABLET FILM COATINGS
1,2-Benzenedicarboxylic acid, diethyl ester can modify mechanical properties of suitable tablet-coating polymers.
A brittle coating may crack during handling, packaging, or storage, while controlled plasticization improves flexibility.
The plasticizer can also influence coating coalescence during manufacture.
This can be particularly relevant when a coating is deposited from a dispersion or solvent system and must form a continuous film.
The concentration used must be optimized with the specific polymer.
Excessive plasticization can produce tack, increased permeability, or unwanted changes in drug-release behaviour.
DENTAL IMPRESSION MATERIALS
1,2-Benzenedicarboxylic acid, diethyl ester has established use as a diluent or plasticizing component in selected polysulfide dental impression materials.
Its liquid character helps modify paste consistency and handling.
Dental impression systems require controlled rheology so that the mixed material can reproduce fine anatomical detail before setting.
A compatible plasticizing liquid can help adjust flow and working characteristics.
Medical and dental use requires a specifically appropriate formulation and regulatory framework for the finished material.
Technical-grade material should not be treated as automatically suitable for clinical applications.
SPECIALTY COMPOSITES AND FILLED SYSTEMS
1,2-Benzenedicarboxylic acid, diethyl ester can serve as a viscosity modifier and plasticizing liquid in selected filled polymer systems.
Its ability to wet compatible organic and inorganic components can assist mixing.
Fillers increase viscosity and can make processing difficult.
A compatible liquid plasticizer can improve flow while remaining substantially within the final matrix.
The influence on long-term mechanical properties, migration, extractability, and environmental resistance should be considered during formulation design.
LABORATORY SOLVENT AND RESEARCH APPLICATIONS
1,2-Benzenedicarboxylic acid, diethyl ester is used in laboratory studies involving plasticizers, phthalate chemistry, environmental fate, polymer compatibility, and analytical method development.
Its well-defined chemical identity makes it a useful representative low-molecular-weight phthalate ester.
Research applications examine hydrolysis, biodegradation, metabolism, migration from polymers, partitioning, and interactions with organic matrices.
The compound is also widely measured as an environmental and product analyte.
High-purity research material allows these processes to be investigated without interference from other phthalate esters or manufacturing impurities.
ANALYTICAL REFERENCE MATERIAL
1,2-Benzenedicarboxylic acid, diethyl ester is an important analytical reference compound in environmental, cosmetic, polymer, food-contact, occupational, and consumer-product testing.
Its widespread historical and current use makes accurate measurement relevant to many analytical programmes.
Gas chromatography coupled with mass spectrometry is particularly suitable for determination of 1,2-Benzenedicarboxylic acid, diethyl ester.
The compound possesses sufficient thermal stability and volatility for routine GC analysis.
Liquid chromatographic techniques can also be used depending on sample matrix and method design.
Mass-spectrometric detection provides additional selectivity where several structurally related phthalates occur together.
Analytical laboratories often measure multiple phthalate esters simultaneously.
High-quality standards therefore support separation and quantification of 1,2-Benzenedicarboxylic acid, diethyl ester alongside dimethyl, dibutyl, benzyl butyl, and higher-molecular-weight phthalates.
ENVIRONMENTAL MONITORING
1,2-Benzenedicarboxylic acid, diethyl ester is monitored in environmental matrices because plasticizers and fragrance-related chemicals can enter wastewater and other environmental pathways during manufacture, use, and disposal.
Analytical programmes may examine water, wastewater, sediment, soil, sewage sludge, indoor dust, air, and biological samples.
The physical properties of 1,2-Benzenedicarboxylic acid, diethyl ester result in behaviour intermediate between highly volatile organic solvents and strongly hydrophobic high-molecular-weight phthalates.
Environmental degradation includes ester hydrolysis and biological conversion.
Monoethyl phthalate and phthalic acid are important transformation products associated with cleavage of the ester groups.
WASTEWATER ANALYSIS
1,2-Benzenedicarboxylic acid, diethyl ester can occur in wastewater from personal-care, fragrance, polymer, chemical, and manufacturing activities.
Monitoring supports evaluation of treatment performance and environmental discharge.
Wastewater-treatment processes can remove the compound through biodegradation, sorption, and other mechanisms.
The relative importance of each pathway depends on treatment conditions and wastewater composition.
Analytical interpretation should account for background contamination because phthalates are common in laboratory environments and many polymeric materials.
Careful sampling and blank control are therefore especially important.
BIOMONITORING AND METABOLISM RESEARCH
1,2-Benzenedicarboxylic acid, diethyl ester is rapidly metabolized primarily through hydrolysis of an ester group to form monoethyl phthalate.
This metabolite is widely used in exposure and metabolism research.
Measurement of monoethyl phthalate in biological samples can provide information regarding recent exposure.
Such research is relevant to occupational health, environmental exposure assessment, and consumer-product studies.
The parent compound and its metabolites should be treated as analytically distinct substances.
The appropriate reference material depends on whether a method measures environmental 1,2-Benzenedicarboxylic acid, diethyl ester or biological transformation products.
GRADE SELECTION AND PRODUCT SUITABILITY
Purity is a principal purchasing parameter for 1,2-Benzenedicarboxylic acid, diethyl ester.
Higher-purity material provides more consistent solvency, odour, colour, plasticization, and analytical performance.
Colour is particularly important in fragrance, cosmetics, clear coatings, transparent polymers, and pharmaceutical coating systems.
Water-white material minimizes contribution to the appearance of the final product.
Odour is also critical for fragrance applications.
Even low concentrations of strongly odorous impurities can interfere with perfume profiles despite the intrinsically mild odour of 1,2-Benzenedicarboxylic acid, diethyl ester.
Acidity can indicate residual phthalic acid, monoethyl phthalate, acidic process residues, or hydrolysis products.
Low and controlled acidity is particularly useful for sensitive resin, fragrance, cosmetic, and coating formulations.
Water content affects clarity, compatibility, hydrolytic stability, and certain polymer-processing operations.
Low moisture is especially useful when the receiving formulation contains water-sensitive ingredients.
Ester purity and related phthalate content can be important for analytical and high-purity industrial applications.
Gas chromatographic analysis provides an effective method for quantifying 1,2-Benzenedicarboxylic acid, diethyl ester and selected organic impurities.
Density and refractive index can provide useful routine identity and quality-control parameters.
These physical tests offer rapid confirmation of lot consistency when combined with chemical assay.
Fragrance and cosmetic applications benefit from grades with tight control of colour, odour, acidity, and impurity profile.
Industrial plasticizer applications may place greater emphasis on assay, moisture, volatility, compatibility, and cost-efficient performance.
Analytical-reference applications require substantially higher characterization.
Defined purity, traceability, small packaging, and appropriate certificate information are central to accurate calibration.
FORMULATION AND PROCESS CONSIDERATIONS
1,2-Benzenedicarboxylic acid, diethyl ester should be incorporated only into polymer systems with adequate thermodynamic compatibility.
Poor compatibility can result in haze, sweating, exudation, migration, or loss of mechanical performance.
Plasticizer loading strongly influences final polymer behaviour.
Increasing concentration generally increases flexibility and lowers effective glass-transition behaviour, but excessive amounts can reduce tensile strength, hardness, dimensional stability, and migration resistance.
Its relatively low molecular weight provides greater mobility than higher phthalate esters.
Long-term retention should therefore be considered where a formulation is exposed to elevated temperature, absorbent substrates, solvents, oils, or prolonged service.
For cellulose-based systems, 1,2-Benzenedicarboxylic acid, diethyl ester can be incorporated during solution preparation or polymer compounding.
Uniform distribution is important for consistent flexibility and transparency.
Fragrance formulations should evaluate solvency for each perfume concentrate.
Some fragrance ingredients can crystallize or separate if the solvent balance changes during storage.
Water-rich cosmetic or household formulations may require suitable surfactants or emulsification systems because 1,2-Benzenedicarboxylic acid, diethyl ester is only slightly soluble in water.
Its distribution between aqueous and organic phases depends on formulation composition.
Heating lowers viscosity and can facilitate transfer but should not be used unnecessarily because the material is already a fluid liquid under normal conditions.
Process equipment should prevent localized overheating and contamination.
Ester hydrolysis can be accelerated by strong acids, strong alkalis, elevated temperature, and prolonged exposure to reactive aqueous conditions.
Formulations operating at extreme pH should therefore consider chemical stability over the intended processing and storage period.
QUALITY, SPECIFICATIONS AND DOCUMENTATION
Relevant quality parameters for 1,2-Benzenedicarboxylic acid, diethyl ester can include assay, appearance, colour, odour, acidity, water content, specific gravity, refractive index, and related organic impurities.
The most important limits depend on intended use.
Gas chromatography is particularly suitable for assay and volatile or semivolatile impurity profiling.
It can distinguish 1,2-Benzenedicarboxylic acid, diethyl ester from related phthalates and process-derived organic compounds.
Water can be measured using an appropriate moisture-analysis method.
Low and reproducible water content supports consistency in non-aqueous formulations.
Acidity testing provides a practical measure of acidic residues or hydrolysis products.
A low acid value is particularly useful for sensitive fragrance, polymer, and coating applications.
Colour can be measured using established liquid-colour scales appropriate to clear organic liquids.
This provides more reproducible quality control than visual assessment alone.
Density and refractive index provide useful identity checks and can also reveal gross contamination.
These measurements are rapid and particularly suitable for incoming raw-material testing.
Odour evaluation remains important for fragrance-grade material.
Instrumental purity alone may not detect every trace impurity that is relevant to a highly sensitive perfume formulation.
A Certificate of Analysis provides batch-specific results for the agreed release parameters.
A Technical Data Sheet provides relevant product characteristics and application information, while the Safety Data Sheet provides hazard, handling, storage, exposure-control, and emergency-response information.
SAFETY AND REGULATORY CONSIDERATIONS
1,2-Benzenedicarboxylic acid, diethyl ester has low volatility at normal ambient temperature but workplace exposure can occur through liquid contact, mist generation, heated processing, or aerosol formation.
Good industrial hygiene should minimize unnecessary exposure.
The material can irritate the eyes, skin, nose, and throat following sufficient exposure.
Protective eyewear, suitable gloves, protective clothing, and effective ventilation are appropriate routine controls.
NIOSH recommends an occupational time-weighted exposure limit of 5 mg/m³ for 1,2-Benzenedicarboxylic acid, diethyl ester.
Processes capable of creating mist or heated vapour should therefore provide suitable engineering controls.
The high flash point means ignition is substantially more difficult than with common low-boiling solvents such as ethanol, acetone, or ethyl acetate.
1,2-Benzenedicarboxylic acid, diethyl ester nevertheless remains a combustible organic liquid and can burn when sufficiently heated.
Strong oxidizing agents should be kept separated from 1,2-Benzenedicarboxylic acid, diethyl ester.
Highly acidic or alkaline conditions can also promote ester hydrolysis and should be controlled according to the process.
Spilled liquid can create slippery surfaces.
Containment and prompt cleanup are therefore important for both occupational and environmental safety.
Environmental discharge should be minimized.
Process wastewater containing 1,2-Benzenedicarboxylic acid, diethyl ester should be managed through appropriate industrial wastewater treatment rather than uncontrolled release.
The regulatory profile of individual phthalate esters differs substantially.
1,2-Benzenedicarboxylic acid, diethyl ester should therefore be evaluated under its own CAS Number 84-66-2 rather than applying restrictions or hazard assumptions associated automatically with other phthalates such as dibutyl phthalate or bis(2-ethylhexyl) phthalate.
Cosmetic, pharmaceutical, food-contact, medical, and similar regulated uses require application-specific compliance with the legislation and quality requirements applicable to the intended market.
The technical suitability of a phthalate ester does not by itself establish authorization for every regulated end use.
FIRST AID
Inhalation: Move the exposed person to fresh air and keep at rest.
Obtain medical attention if irritation, headache, dizziness, nausea, respiratory discomfort, or other persistent symptoms develop.
Skin Contact: Remove contaminated clothing and wash affected skin thoroughly with soap and water.
Obtain medical attention if irritation persists after washing.
Eye Contact: Rinse immediately and cautiously with plenty of clean water for several minutes while holding the eyelids open.
Remove contact lenses when easy to do and continue rinsing until the material has been removed.
Ingestion: Rinse the mouth and obtain medical attention following significant ingestion or development of symptoms.
Do not induce vomiting unless directed by qualified medical personnel.
Note to Physicians: Treatment should be based on the route and degree of exposure and the observed clinical condition.
HANDLING AND STORAGE
Handling: Avoid unnecessary skin and eye contact and prevent generation of aerosols or mists.
Use clean transfer equipment and good industrial hygiene during pumping, sampling, mixing, and filling.
Ventilation: Provide effective general ventilation and local exhaust where 1,2-Benzenedicarboxylic acid, diethyl ester is heated, sprayed, atomized, or otherwise capable of producing airborne material.
Storage: Store 1,2-Benzenedicarboxylic acid, diethyl ester in tightly closed containers in a cool, dry, well-ventilated area.
Protect the material from excessive heat, contamination, and incompatible reactive chemicals.
Incompatibilities: Keep separated from strong oxidizing agents and strongly reactive acidic or alkaline materials.
Packaging: Use clean, dry, chemically compatible containers that protect the liquid from contamination, moisture ingress, and product loss.
PACKAGING AND PROCUREMENT CONSIDERATIONS
1,2-Benzenedicarboxylic acid, diethyl ester can be supplied in drums, intermediate bulk containers, or bulk liquid systems depending on consumption and logistics requirements.
Packaging materials should be compatible with the ester and should not introduce colour, odour, moisture, or particulate contamination.
Fragrance and cosmetic buyers should give particular attention to odour neutrality.
A batch that meets basic assay requirements can still be unsuitable for sensitive perfume manufacture if trace impurities alter the intended fragrance profile.
Colour should also be tightly controlled for perfumes, clear cosmetics, transparent plastics, pharmaceutical coatings, and colourless lacquer systems.
Water-white appearance provides a useful practical indication of well-purified material.
Plasticizer users should evaluate compatibility with the specific polymer rather than selecting 1,2-Benzenedicarboxylic acid, diethyl ester solely by viscosity or price.
Plasticizer efficiency, permanence, migration, extraction resistance, volatility, and mechanical effects differ between polymer systems.
Cellulose acetate and nitrocellulose applications benefit from the strong solvating and plasticizing behaviour of the relatively small ester molecule.
The required concentration depends on polymer molecular weight, degree of substitution, solvent system, and finished flexibility target.
Coating and ink manufacturers can place emphasis on plasticizing efficiency, colour, acidity, and compatibility with the binder.
Low acidity can be particularly useful where the resin or pigment system is sensitive to acidic contaminants.
Adhesive and sealant applications should additionally consider long-term migration and interaction with adjacent substrates.
A low-molecular-weight plasticizer can move more readily than larger plasticizer molecules under some service conditions.
Pharmaceutical and dental applications require specifically appropriate quality and regulatory documentation.
A technical or fragrance grade should not be treated as automatically equivalent to a grade intended for regulated medical or pharmaceutical manufacturing.
Analytical laboratories require high-purity 1,2-Benzenedicarboxylic acid, diethyl ester with well-characterized composition.
Reference standards and prepared solutions are particularly useful for GC-MS, HPLC, environmental monitoring, product testing, and phthalate screening.
Bulk users should consider tank materials, unloading connections, contamination control, inventory turnover, and temperature management.
The low freezing point generally allows straightforward ambient-temperature storage in many climates.
Procurement specifications can include assay, colour, odour, acidity, water content, density, refractive index, related phthalates, physical appearance, packaging, and required documentation.
The specification should be matched to the actual downstream function rather than imposing the same limits on fragrance, plasticizer, coating, pharmaceutical, and analytical grades.
Ataman Kimya can support enquiries for 1,2-Benzenedicarboxylic acid, diethyl ester concerning purity, fragrance and cosmetic applications, specialty plasticization, cellulose-based polymers, coatings, adhesives, grade selection, technical specifications, documentation, packaging, and supply requirements.
For product and procurement information, contact Ataman Kimya at +90 216 577 10 10 or [info@atamankimya.com](mailto:info@atamankimya.com).
