Ionic liquids:Functionalization and absorption of SO_2

作     者：Shuhang Ren Yucui Hou Kai Zhang Weize Wu 

作者机构：State Key Laboratory of Chemical Resource EngineeringBeijing University of Chemical Technology Department of ChemistryTaiyuan Normal University 

出 版 物：《Green Energy & Environment》 (绿色能源与环境（英文版）)

年 卷 期：2018年第3卷第3期

页      面：179-190页

核心收录：

学科分类：0820[工学-石油与天然气工程] 083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China (21306007 and 21176020) Research Fund for the Doctoral Program of Higher Education of China (20130010120005) 

主　　题：Ionic liquid SO2 Absorption Functionalization 

摘      要：Room-temperature ionic liquids(ILs), which have excellent properties, such as high gas absorption abilities, extremely low volatility and tunable structures, are regarded as environmentally-friendly absorbents and widely used in SO_2 absorption and separation. As a result, a large number of ILs have been synthesized to capture SO_2 from flue gas or simulated gas, but a part of them just have physical interaction with SO_2 and can hardly absorb SO_2 when the content of SO_2 is very low. Hence, functional ILs, which can chemically absorb a large amount of SO_2 with low contents, have been designed and synthesized for SO_2 capture. Up to now, many kinds of functional ILs were investigated for SO_2 absorption from flue gas. In this review, the functional ILs are classified into guanidinium based ILs, hydroxyl ammonium based ILs, imidazolium/pyridinium based ILs, quaternary ammonium based ILs, phosphonium based ILs, and other kinds of ILs according to their cations. The capacities of SO_2 absorption in these ILs, the mechanism of the absorption, and the ways to enhance the absorption are briefly introduced. The prospect of functional ILs for their application in SO_2 removal is presented. The present problems and the further studies are also discussed.