磷酸硼固体酸催化合成邻苯二甲酸二乙酯的性能研究

以邻苯二甲酸酐和无水乙醇为原料，固体磷酸硼为催化剂，在醇酐比为4：1，催化剂用量为苯酐用量的20．3％，反应时间8h，反应温度80℃条件下合成邻苯二甲酸二乙酯（DEP），探讨了影响催化剂催化效果的各个因素。实验表明，催化剂最佳的制备条件为：磷酸、硼酸和硫酸的摩尔比为1：1：1，焙烧温度为300℃，焙烧时间为3．5h。DEP最高产率可达75％。

Synthesis of Diethyl Phthalate Through Phosphoric and Boric Solid Acid Catalysts

The synthesis of diethyl phthalate(DEP)was performed by esterification of ethanol and phthalic anhydride through the catalysis of phosphoric and boric solid acid.The reaction conditions were as following:the ratio of butanol to phthalic anhydride(4:1),the mass of catalyst(20.3% of phthalic anhydride),the reaction time(8h),temperature(80℃).Some factors on preparing the solid acid catalysts which may influence the catalyzing effect were also investigated.The results show that the maximum productivity of DEP can reach 75% by the catalysis of the catalyst which was prepared under following conditions:the ratio(phosphoric acid,boric acid,sulphuric acid ratio)(1:1:1),roasting temperature(300℃),roasting time(3.5 h).