钛酸酯催化碳酸乙烯酯与对苯二甲酸二甲酯的酯交换反应  

Transesterification of Ethylene Carbonate and Dimethyl Terephthalate with Titanate Catalysts

作　　者：张丹[1] 姚洁[1] 刘绍英[1] 李建国[1] 雷永诚[1] 王公应[1] 

机构地区：[1]中国科学院成都有机化学研究所

出　　处：《石油化工》2007年第3期282-284,共3页Petrochemical Technology

摘　　要：以钛酸四甲酯、钛酸四异丙酯和钛酸四丁酯为催化剂,研究了碳酸乙烯酯(EC)与对苯二甲酸二甲酯(DMT)的酯交换反应。该反应可同时合成碳酸二甲酯(DMC)和聚对苯二甲酸乙二醇酯,避免产生大量的副产物甲醇和乙二醇,提高了原子经济性。在相同条件下,钛酸四丁酯对该反应的催化效果最佳。考察了反应温度、反应时间、原料配比、催化剂用量对DMC收率的影响,得到最佳反应条件:反应温度250℃、反应时间3h、钛酸四丁酯与EC的摩尔比为0.002、EC与DMT的摩尔比为1∶3,在此条件下,DMC收率为62.2%。Transesterification of ethylene carbonate （ EC ） and dimethyl terephthalate （ DMT ） to synthesize dimethyl carbonate （DMC） and polyethylene terephthalate was studied on three titanate catalysts, namely tetramethyl titanate, tetraisopropyl titanate and tetrabutyl titanate. This method improved atom economy of the production by avoiding formation of by - products--methanol and ethylene glycol. Catalytic activity of tetrabutyl titanate is the highest among the three titanates. Effects of reaction temperature, reaction time, ratio of two reactants and catalyst dosage on yield of DMC were investigated. Under optimal conditions： reaction temperature 250 ℃, mole ratio of EC to DMT 1 ： 3, reaction time 3 h and mole ratio of tetrabutyl titanate to EC 0.002, yield of DMC is 62.2%.

关 键 词：碳酸乙烯酯 对苯二甲酸二甲酯 碳酸二甲酯 聚对苯二甲酸乙二醇酯 酯交换 钛酸酯 催化 

分 类 号：TQ225.52[化学工程—有机化工]