Abstract:

A new method was proposed to prepare water-soluble ionic liquids by using four-compartment electrodialysis.1-Ethyl-3-methylimidazolium tetrafluoroborate (［EMIm］BF₄), used as a model ionic liquid, was synthesized.Operation voltage, feed concentration and the type of ion-exchange membrane had important impacts on the performances of the electrodialysis process, such as average current efficiency, energy consumption and product yield.Compared with the traditional method of chemical synthesis, this new method was more eco-friendly and economical.Less reaction time was needed though the reaction proceeded at room temperature.No traditional solvent was needed and higher purity was obtained by the new method.

Key words:

电渗析, 四隔室, 水溶性, 离子液体

摘要：

以1-乙基-3-甲基咪唑四氟硼酸盐（［EMIm］BF₄）的制备为例，对四隔室电渗析法制备水溶性离子液体进行了研究。分别考察了操作电压、进料浓度和离子交换膜种类对平均电流效率、能耗和收率3个电渗析过程性能参数的影响。实验结果表明，相比于传统的化学合成法制备离子液体，采用四隔室电渗析法制备水溶性离子液体具有反应条件温和（室温下反应）、反应时间短、反应无须传统有机溶剂（水作反应溶剂）和产物纯度高（最高可达98％）的优点。

关键词:

电渗析, 四隔室, 水溶性, 离子液体