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Diethyl phthalate (dep) is a chemical substance with the molecular formula C12H14O4. Colorless to yellowish clear oily liquid. Easily soluble in ethanol, ether, acetone, benzene, carbon tetrachloride, and almost insoluble in water. It is used as plasticizer, solvent, lubricant, fragrance fixing agent, foaming agent for flotation of nonferrous or rare metal mines, gas chromatography stationary liquid, alcohol denaturant and spray insecticide. Store in a cool and ventilated warehouse. Keep away from kindling and heat source. It shall be stored separately from oxidants and acids and shall not be mixed. Fire fighting equipment of corresponding types and quantities shall be provided. The storage area shall be equipped with leakage emergency treatment equipment and appropriate materials. Plasticizer, solvent, lubricant, fragrance fixing agent, foaming agent for nonferrous or rare metal mine flotation.
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Chemical Formula |
C12H14O4 |
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Exact Mass |
222 |
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Molecular Weight |
222 |
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m/z |
222 (100.0%), 223 (13.0%) |
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Elemental Analysis |
C, 64.85; H, 6.35; O, 28.80 |
1. Diethyl phthalate is an intermediate of rodenticide diphacin, tetramine and chlorratone, and also an important solvent. Used as a plasticizer for plastics.
2. Solvent, plasticizer and lubricant used as analytical reagent, stationary liquid of gas chromatography, cellulose and ester
3. It is used as plasticizer, solvent, lubricant, fragrance fixing agent, foaming agent for flotation of nonferrous or rare metal mines, gas chromatography fixed liquid, alcohol denaturant and spray insecticide. The product has good compatibility with cellulose acetate, cellulose acetate butyrate, polyvinyl acetate, cellulose nitrate, ethyl cellulose, polymethyl methacrylate, polystyrene, polyvinyl butyral, vinyl chloride vinyl acetate copolymer and other resins. It is mainly used as the plasticizer of cellulose resin, but its volatility is large, limiting its wide application. The toxicity of this product is low, and the oral LD50 of rabbits is 1000mg/kg.
4. It can be used as a fixative of perfume, and also as a plasticizer of alkyd resin, nitrile rubber and chloroprene rubber; The intermediates of rodenticide diphacinone, rat poison and chlorratone are also important solvents; Used as analytical reagent, stationary liquid of gas chromatography, solvent of cellulose and ester, plasticizer and lubricant; It is used as plasticizer, solvent, lubricant, fragrance fixing agent, foaming agent for flotation of nonferrous or rare metal mines, gas chromatography fixed liquid, alcohol denaturant and spray insecticide. The product has good compatibility with cellulose acetate, cellulose acetate butyrate, polyvinyl acetate, cellulose nitrate, ethyl cellulose, polymethyl methacrylate, polystyrene, polyvinyl butyral, vinyl chloride vinyl acetate copolymer and other resins. It is mainly used as the plasticizer of cellulose resin, but its volatility is large, limiting its wide application. The toxicity of this product is low, and the oral LD50 of rabbits is 1000 mg/kg.
Generally, diethyl phthalate is synthesized by direct esterification with alkyd, and the specific process is as follows:
1. With phthalic anhydride and ethanol as raw materials, excessive ethanol as water carrying agent, esterification is carried out at ethanol reflux temperature. The crude ester is neutralized, washed and rectified to obtain the finished product.
2. Add phthalic anhydride and excess ethanol into the reaction pot, then add concentrated sulfuric acid as the catalyst, and carry water back. The obtained crude ester is neutralized, washed and distilled to obtain a finished product. Each ton of product consumes 760kg of phthalic anhydride and 700kg of ethanol. The process can refer to dioctyl phthalate.
3. Add solid acid catalyst ferric chloride, phthalic anhydride and ethanol [shape (phthalic anhydride): shape (ethanol)=1 ∶ 1.5] into the round bottom flask equipped with the water flow condensation reflux device of the water separator, and then add the water carrying agent cyclohexane. Heat and reflux, and react for about 1.5h. Stop the reaction when the volume of water layer in the water separator no longer increases. After cooling, the reactant is transferred to the distillation flask. First, cyclohexane is distilled out under normal pressure, and then the colorless liquid fraction at 156 ℃/1.41kPa is collected by vacuum distillation, which is the finished product.
This is the specific step of the traditional synthesis method commonly used in China at present. The product is obtained by esterification of phthalic anhydride and absolute ethanol under the action of concentrated sulfuric acid, and the esterification liquid is neutralized, dehydrated and fractionated. Among them, sulfuric acid has the advantages of strong acidity, strong water absorption and low price, but it also has oxidation, which may lead to sulfonation, carbonization or polymerization and other side reactions, resulting in poor selectivity, low reaction yield, corrosion of equipment, generation of a large number of waste liquid, causing environmental pollution. Using solid acid as catalyst can avoid the disadvantages of traditional methods, and has the advantages of high reaction activity, fast reaction speed, short reaction time, good selectivity, etc. The process is relatively simple and easy to industrialization. It can not only overcome the shortcomings of concentrated sulfuric acid as catalyst, such as corrosion of equipment and environmental pollution, but also reuse the catalyst and improve the utilization rate. Solid acid catalysts mainly include molecular sieve type, functional polymer type, heteropoly acid type and solid super acid type.
Chemical and Physical Properties
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DEP is a clear, oily liquid that is practically odorless or has a very faint aromatic scent. It exhibits low volatility and is soluble in water at a concentration of approximately 1000 mg/L at 25°C. DEP is miscible with ethanol and ethyl ether and can dissolve in acetone, benzene, carbon tetrachloride, alcohols, ketones, esters, and aromatic hydrocarbons. It shows partial miscibility with aliphatic solvents. When exposed to heat, DEP decomposes, emitting acrid smoke and irritating fumes, indicating its thermal instability under extreme conditions. The structural formula of DEP consists of a benzene ring with two carboxyl groups (–COOH) esterified with ethyl groups (–C₂H₅). This structure imparts flexibility to polymers when DEP is used as a plasticizer, making it a valuable additive in the plastics industry. |
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Industrial and Consumer Applications
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DEP's primary role is as a plasticizer, enhancing the flexibility and durability of plastics. It is extensively used in the production of cellulose ester plastic films and sheets, which find applications in photography, blister packaging, and adhesive tapes. Molded and extruded articles such as toothbrushes, automotive components, tool handles, and toys also incorporate DEP to improve their physical properties. In the cosmetics and personal care industry, DEP serves multiple purposes. It acts as a solvent for fragrances, helping to dissolve and stabilize perfume compounds. DEP is also found in deodorants, emollients, and insect repellents, where it contributes to product consistency and effectiveness. Additionally, DEP is used as a plasticizer in medical treatment tubing, ensuring flexibility and ease of use in healthcare settings. |
| Beyond these applications, DEP functions as an analytical reagent, a gas chromatography stationary phase, and a lubricant. Its versatility stems from its ability to interact favorably with various substances, making it indispensable in numerous industrial processes. |
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Detection and Analysis Methods
Accurate detection and quantification of DEP in environmental samples are crucial for assessing its presence and impact. Gas chromatography coupled with mass spectrometry (GC-MS) is the most commonly used method for DEP analysis. GC-MS offers high sensitivity and specificity, allowing for the detection of trace amounts of DEP with minimal interference from other compounds. High-performance liquid chromatography (HPLC) with ultraviolet (UV) detection is another viable option, although it may be less selective than GC-MS.
For biological samples, such as urine, triple quadrupole tandem MS with chemical ionization after β-glucuronidase hydrolysis and HPLC separation is employed to analyze MEP, the primary metabolite of DEP. This method enables the assessment of human exposure to DEP by measuring its metabolic products.
Conclusion and Future Perspectives
Diethyl phthalate (DEP) is a versatile compound with widespread applications in various industries. Its unique physicochemical properties make it an valuable additive in plastics, cosmetics, and personal care products. However, the environmental persistence and potential health effects of DEP have raised concerns about its safe use and disposal.
While DEP undergoes rapid biodegradation in soil and water under favorable conditions, improper waste management practices can lead to its accumulation in the environment and entry into the food chain. Chronic exposure to DEP has been associated with reproductive and developmental toxicity, carcinogenicity, genotoxicity, and endocrine disruption, although the evidence remains inconclusive in many cases.
To address these concerns, regulatory agencies have established guidelines and limits for DEP use and exposure, and ongoing research continues to investigate its long-term health effects and environmental behavior. Future perspectives include the development of safer alternatives to DEP, improved waste management practices, and enhanced monitoring and control measures to minimize its release into the environment.
As consumers become increasingly aware of the potential risks associated with chemical exposure, there is a growing demand for safer and more sustainable products. By adopting a precautionary approach and promoting the use of environmentally friendly alternatives, we can mitigate the risks posed by DEP and other potentially harmful chemicals, ensuring a healthier future for generations to come.
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