Production process of diethyl phthalate

The invention relates to the field of production and synthesis of chemical substances, and particularly discloses a production process of diethyl phthalate. The production process of the diethyl phthalate comprises the following steps: uniformly mixing phthalic anhydride, absolute ethyl alcohol, an entrainer and a boric acid-phosphoric acid-sulfuric acid composite catalyst, reacting at the temperature of 65-90 DEG C for 7.5-9.0 hours, neutralizing an esterified material, washing with water, dehydrating, and filtering to obtain the diethyl phthalate. The product disclosed by the invention has the advantages of high yield and high purity, the yield can reach 98.52 to 98.57 percent, and the purity can reach 99.43 to 99.49 percent; in addition, the preparation method has the advantages that steps are simple, raw materials are easy to obtain, and substances produced after reaction are small in environmental pollution and low in harm. 本申请涉及化学物质的生产合成领域，具体公开了一种邻苯二甲酸二乙酯的生产工艺。一种邻苯二甲酸二乙酯的生产工艺包括以下步骤：将邻苯二甲酸酐、无水乙醇、共沸剂以及硼酸-