[bmim]BF_4离子液体的制备及其催化酯化反应研究  

Preparation of [bmim]BF_4 Ionic Liquid and Its Catalyzed Esterification

作　　者：杨辉琼[1] 易翔[1] 

机构地区：[1]湖南工程学院化学化工系,湖南湘潭411104

出　　处：《湖南工程学院学报（自然科学版）》2008年第1期80-83,共4页Journal of Hunan Institute of Engineering(Natural Science Edition)

摘　　要：本文采用一步环合法合成了N-甲基咪唑,再由N-甲基咪唑和溴代正丁烷合成了中间体溴化1-丁基-3-甲基咪唑,中间体再经过离子交换得到1-丁基-3-甲基咪唑四氟硼酸盐([bmim]BF4)离子液体.在该离子液体介质中,氯苄和乙酸钠反应高效合成了乙酸苄酯.结果表明:以[bmim]BF4为溶剂和催化剂乙酸钠与苄氯的摩尔比为1.4:1,反应温度为60℃,反应时间为2.5 h,氯苄转化率可达95%.而且产物易于分离,离子液体可重复使用.中间体和产物结构经FT-IR表征.N-methylimidazole is synthesized by a step of cyclelazation. The intermediate 1-Butyl-3-methylimdazoli- um bromide is synthesized from 1-methylimidazole and 1-bromobutane. After ion exchanging, 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquids is obtained. The benzyl acetate is synthesizied by sodium acetate and benzyl chloride in the ionic liquid. The results show that the solvent and catalyst is [ bmim] BF4 ; the molar ratio of sodium acetate and benzyl chloride is 1.4 ： 1 ; the reaction temperature is 60℃ ;the reaction time is 2.5 hours and the transformation ratio of benzyl chloride can reach 95 %. The product is easy to separate and the ionic liquid can be reused. The intermediate and product are characterized by FT-IR.

关 键 词：离子液体 1-丁基-3-甲基咪唑四氟硼酸盐 制备 乙酸苄酯 

分 类 号：TQ252.3[化学工程—有机化工]