一种2-甲基咪唑离子液体的合成及其在酯交换反应中的应用  

Synthesis of a 2-methylimidazolium Ionic Liquid and its Application in Transesterification Reaction

作　　者：王国松[1] 王玖钊[1] 裴继凯[1] 任建国[1] 王自为[1] 

机构地区：[1]山西大学化学化工学院,山西太原030006

出　　处：《山西大学学报（自然科学版）》2009年第1期72-75,共4页Journal of Shanxi University(Natural Science Edition)

基　　金：山西科委攻关项目(20021109)

摘　　要：以2-甲基咪唑为原料合成了一种室温离子液体(1-丁基-2,3-二甲基咪唑甲基硫酸盐),并对其进行了1H NMR1、3C NMR表征并确认,然后进行了催化酯交换反应及重复利用性研究.结果表明离子液体1-丁基-2,3-二甲基咪唑甲基硫酸盐是酯交换反应较为理想的绿色溶液催化剂,并通过气相色谱分析发现其催化的酯交换反应最佳原料配比为1∶0.3;最佳反应时间在8 h;最佳催化剂用量为6%,该离子液体经重复利用后,其催化效能几乎不变.A kind of room temperature ionic liquids （1-butyl-2, 3-dimethylimidazolium methyl sulfate） based on the cheap and widely used 2-methylimidazole are synthesized and confirmed by ^1H NMR, ^13C NMR. The sulfonate ionic liquids was used in transesterification reaction as a catalyst and the reuse properties has been studied. The results show that the ionic liquid （1-butyl-2,3-dimethylimidazolium meth- yl sulfate） is an ideal green catalyst in transesterification reaction. Moreover, the effects of the reaction time,ester/alcohol ratio on reaction materials,and the amount of ionic liquids on transesterification the reaction are investigated. The optimum reaction conditions are that reaction time is eight hours, ester/alcohol ratio is 1： 0.3,and the used amount is 6% based on the total materials. When the ionic liquid are recovered and then reused, its catalytic properties are nearly unchanged.

关 键 词：离子液体 1-丁基-2 3-二甲基咪唑甲基硫酸盐 2-甲基咪唑 酯交换 

分 类 号：O621.3[理学—有机化学]