Synthesis of DEP Diethyl Phthalate Diethyl phthalate: phthalic anhydride and absolute ethanol as raw materials, p-toluenesulfonic acid as catalyst and cyclohexane as water-carrying agent The mixture was refluxed under heating and stirring for 8 hours to synthesize diethyl phthalate. After the reaction was completed, ethanol was removed by atmospheric distillation. After cooling, the product was obtained by distillation under reduced pressure in a yield of 49.5%, and the product was characterized by IR and refractive index as the desired product. Key words: diethyl phthalate; p-toluenesulfonic acid; cyclohexane; synthesis CLC number: TQ245.2+4 Document code: A Article ID:1003-5095(2011)04-0037 -03 SynthesisofDiethylPhthalate ZHULei, LIGong-chun, JIANGDan (CollegeofChemistryandChemicalEngineering, XuchangUniversity, Xuchang461000, China) Abstract:. Diethylphthalatewassynthesizedbyrefluxingfor8hundertheconditionsofstirring, withphthalicanhydrideandanhydrousethanolasrawmaterial, p-methylbenzenesulfonicacidascatalyst, cyclohexaneaswatercarrier.Afterthereaction, ethanolwasdistilledundertheconditionsofdistillation.Fractionwascollectedundertheconditionsofthevacu-umdistillation, theyieldwas49.5% .ThestructureoftargetcompoundfounctionswereconfirmedbyIRspectralcharac-terization Keywords: Diethylphthalate;p-methylbenzenesulfonic acid;cyclohexane;synthesis diethyl phthalate (DEP), also known as diethyl orthophthalate or ethyl citrate, is a non-toxic, colorless, transparent oily liquid that can be used in plastics. Plasticization of fiber resin, its low temperature Softness and durability are better than dimethyl phthalate, often with dimethyl phthalate and used in cellulose acetate to improve the water resistance, elasticity, light resistance and hardness of the product; A product with high strength, good light resistance and no odor can be obtained [1]. DEP can be used as a tackifier for polyvinyl acetate emulsions, as a solvent and lubricant in the manufacture of pharmaceuticals, as a fragrance-retaining agent, as a non-toxic adhesive for food packaging films, as a foaming agent for flotation of colored or rare metal mines. , gas chromatography stationary liquid, alcohol denaturant, spray insecticide, stabilizer for rocket propellant, etc. [2]. Although DEP has limited development due to its high volatility, there are still very broad markets in other fields, such as cellulose acetate and butyrate. The usual method for synthesizing DEP is to use the direct esterification of alkyd [3]. At present, the traditional synthetic method commonly used in China is to carry out esterification reaction of phthalic anhydride and anhydrous ethanol under the action of concentrated sulfuric acid, and the esterification liquid is neutralized, dehydrated and fractionated to obtain a finished product. Sulfuric acid has the advantages of strong acidity, strong water absorption and low cost, but it is also oxidizing, which may cause side reactions such as sulfonation, carbonization or polymerization [4], resulting in poor selectivity, low reaction yield, and corrosion equipment. [5-7], a large amount of waste liquid is generated, causing environmental pollution. The use of solid acid as a catalyst can avoid the disadvantages of the traditional method, and has the advantages of high reactivity, fast reaction speed, short reaction time, good selectivity, etc. The process is relatively simple and easy to industrialize. It can not only overcome the disadvantages of concentrated sulfuric acid as a catalyst corrosion equipment, pollution environment, etc., but also the catalyst can be reused and the utilization rate can be improved. Solid acid catalyst mainly includes molecular sieve type, functional polymer type, heteropoly acid type and solid super acid.
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