碳酸二甲酯和乙醇酯交换合成碳酸二乙酯的催化剂研究

STUDY ON CATALYSTS IN TRANSESTERIFICATION OF DIMETHYL CARBONATE AND ETHANOL TO DIETHYL CARBONATE

研究了一种甲醇钠 /三乙醇胺复合催化剂用于碳酸二甲酯 (DMC)与乙醇酯交换合成碳酸二乙酯 (DEC)反应 ,该催化剂具有较高的催化活性 ,又有良好溶解性 ,可以重复使用 ,寿命较长。当摩尔比DMC∶乙醇∶催化剂 =1∶8∶0 .0 1,反应温度 78℃ ,反应时间 4h时 ,DMC的转化率达到 97.3% ,生成碳酸甲乙酯 (MEC)和DEC的选择性分别为 33.4 %和 6 6 .6 %。

A mixed catalyst of sodium methoxide and triethanolamine was prepared for transesterification of ethanol and dimethyl carbonate to diethyl carbonate. The catalyst exihibited higher activities,better solubility and longer duribility.It has also found that the conversion of DMC, selectivities for methyl ethyl carbonate and diethyl carbonate were 97.3%, 33.4% and 66.6%,respectively, at the conditions of reaction time of 4 hours, dimethyl carbonate:ethanol:catalyst(molar ratio) of 180.01 and reaction temperature of 78℃.