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由于离子液体对CO2具有较好的溶解选择性,离子液体支撑液膜分离CO2越来越受到关注。比较了含3种不同阴离子的常规离子液体([bmim][BF4]、[bmim][PF6]、[bmim][Tf2N])作为支撑液膜的液膜相分离CO2/CH4的性能,考察了咪唑环上烷基链长对离子液体支撑液膜性能的影响。考虑向离子液体中引入胺基和羧基等亲CO2基团,制备了1-丁基-3-甲基咪唑丙氨酸离子液体([bmim][β-Ala]),考察了[bmim][β-Ala]支撑液膜分离CO2/CH4的性能,并对在CO2渗透测试前后的支撑液膜进行了FT-IR分析,发现氨基酸离子液体中的—NH2和CO2的较强作用以及该离子液体的高黏性影响了CO2的透过性,使[Bmim][β-Ala]支撑液膜的CO2透过率低。
Due to the better solubility selectivity of CO2 for ionic liquids, CO2 is getting more and more attention due to ionic liquid supporting liquid membrane. The performance of liquid membrane separation of CO2 / CH4 with support membranes was compared with conventional ionic liquids containing three different anions ([bmim] [BF4], [bmim] [PF6], [bmim] [Tf2N] Effect of Alkyl Chain Length on Imidazole Ring on Performance of Ionic Liquid Support Films. Considering the introduction of amine groups and carboxyl groups such as carboxyl groups into ionic liquids, 1-butyl-3-methylimidazolylalanine ionic liquid ([bmim] [β-Ala] β-Ala] supported liquid membrane separation of CO2 / CH4 performance, and in the CO2 permeation test before and after the support liquid film FT-IR analysis found amino acid ionic liquid -NH2 and CO2 strong role and the ionic liquid The high viscosity affects the CO2 permeability and lowers the CO2 permeability of [Bmim] [β-Ala] supported liquid membrane.