Separation of ionic liquids from dilute aqueous solutions using the method based on CO_2 hydrates  

作　　者：Xiaoming Peng Yufeng Hu Yansheng Liu Chuanwei Jin Huaijing Lin 

机构地区：[1]State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China [2]School of Chemical Engineering, Sichuan University, Chengdu 610065, Sichuan, China

出　　处：《Journal of Natural Gas Chemistry》2010年第1期81-85,共5页天然气化学杂志（英文版）

基　　金：supported by the National Natural Science Foundation of China (40673043 and 20576073);the Program for New Century Excellent Talents in University of Ministry of Education of China (NCET-06-0088)

摘　　要：Ionic liquids （ILs） have been regarded as the potential novel solvents for improved analytical- and process-scale separation methods.The development of methods for the recovery of ILs from aqueous solutions to escape contamination and recycle samples will ultimately govern the viability of ILs in the future industrial applications. Therefore, in this paper a new method for separation of ILs from their dilute aqueous solutions and simultaneously purification of water was proposed on the basis of the CO2 hydrate formation. For illustration, the dilute aqueous solutions with concentrations of ILs ranging from 2× 10^-3 mol% to 2×10^-1 mol% were concentrated. The results show that the separation efficiency is very impressive and that the new method is applicable to aqueous solutions of both hydrophobic and hydrophilic ILs. Compared to the literature separation method based on the supercritical CO2, the new method is applicable to lower concentrations, and more importantly, its operation condition is mild.Ionic liquids （ILs） have been regarded as the potential novel solvents for improved analytical- and process-scale separation methods.The development of methods for the recovery of ILs from aqueous solutions to escape contamination and recycle samples will ultimately govern the viability of ILs in the future industrial applications. Therefore, in this paper a new method for separation of ILs from their dilute aqueous solutions and simultaneously purification of water was proposed on the basis of the CO2 hydrate formation. For illustration, the dilute aqueous solutions with concentrations of ILs ranging from 2× 10^-3 mol% to 2×10^-1 mol% were concentrated. The results show that the separation efficiency is very impressive and that the new method is applicable to aqueous solutions of both hydrophobic and hydrophilic ILs. Compared to the literature separation method based on the supercritical CO2, the new method is applicable to lower concentrations, and more importantly, its operation condition is mild.

关 键 词：ionic liquids separation CO2 hydrates aqueous solution 

分 类 号：TQ028.8[化学工程] TS193.59[轻工技术与工程—纺织化学与染整工程]