酸性功能化离子液体催化脂肪族醇酸酯化反应

实验探索了酸性功能化室温离子液体1-甲基-3-丙磺酸基咪唑硫酸氢盐([mimps][HSO_4])催化乙酸、丙酸与乙醇、异丙醇、正丁醇进行醇酸酯化反应的新工艺。考察了反应温度、反应时间、物料比等对酯化反应的影响。结果表明:在优化工艺条件下,乙酸乙酯、乙酸异丙酯、乙酸丁酯、丙酸乙酯、丙酸丁酯的产率分别为82%,86%,87%,72%,83%,化学选择性超过99%,生成的羧酸酯不溶于催化体系,产物与催化体系分层,通过简单的倾析实现产物分离过程。离子液体循环使用10次,催化活性无明显降低。

ESTERIFICATION OF ALIPHATIC ACID AND ALCOHOL CATALYZED BY ACID FUNCTIONALIZED IONIC LIQUID

The new method of catalytic esterification reaction for acetic acid and propanoic acid with ethanol,and isopropanol with butyl alcohol in acid functionalized ionic liquid l-methyl-3-n-propyl sul- fonic acid imidazolium hydrogen sulfate([mimps][HSO_4]) was investigated.The effects of reaction temperature,reaction time,and molar ratio of the reactants on the esterification were explored.Under the optimal reaction conditions,the yields of ethyl acetate,isopropyl acetate,butyl acetate,ethyl propionate,and butyl propionate were 82%,86%,87%,72%,83%,respectively,and the selectivi-ties were all above 99%.The products were immiscible with[mimps][HSO_4]and could be separated simply by decantation after the reaction.As an environmental benign dual solvent-catalyst,the [mimps][HSO_4]could be reused for 10 times without noticeable lowering of activity.