碳酸二甲酯和乙二醇乙醚酯交换合成碳酸甲基-2-乙氧乙基酯

Carbonic acid,2ethoxyethyl Methyl Ester is Synthesized by Transesterification with Dimethyl Carbonate and Glycol Ether

以碳酸二甲酯和乙二醇乙醚为原料,在氢氧化钾的催化作用下进行酯交换反应,得到一种清洁含氧燃料添加剂,名为碳酸甲基-2-乙氧乙基酯.采用IR、1HNMR、13CNMR、折光率等对其结构进行了表征,结果表明所合成物质即为目的物.考察了碳酸二甲酯和乙二醇乙醚的摩尔比、催化剂种类和用量、反应温度及反应时间对反应的影响.得到的最佳反应条件（以0.05 mol乙二醇乙醚计）为n（碳酸二甲酯）∶n（乙二醇乙醚）=4∶1,催化剂氢氧化钾为乙二醇乙醚的10%（质量分数）,反应温度90℃~105℃,持续反应3 h.在此条件下,重复试验3次,所得碳酸甲基-2-乙氧乙基酯的平均收率为76.78%.

A clean diesel fuel additive is got by transesterification,which name is carbonic acid, 2ethoxyethyl methyl ester,which raw materials are dimethyl carbonate and glycol ether, and which catalyst is KOH . its structure is characterized by IR, I HNMR, 13CNMR,refractive index and so on ,and the results show that the synthetic material is the target product. It is studied the effects of some factors on the reaction, which includes the molar ratio of dimethyl carbonate and ethylene glycol diethyl ether, the type and amount of the catalyst and the reaction time. The Optimal reaction conditions are （the datum is 0.05mol glycol ether） as follows： n （ dimethyl carbonate） ： n （ glycol ether） is 4： 1, the quality of KOH is ten percent of the glycol ether, the range of the reaction temperature is 90 degrees to 105 degrees,the reaction is continued for 3 hours. Under the above conditions, the average yield of Carbonic acid, 2 ethoxyethyl methyl ester is 76.78% with 3 parallel tests.