Ionic liquids (ILs) have attracted increasing interests for SO2 capture due to their unique physico-chemical properties. In this paper the characteristics and advantages of ILs over traditional absorbents are introduced. The recent progress of ionic liquids for SO2 removal, including the solubility of SO2 in guanidinium-based, imidazolium-based, amines-based and other kinds of ionic liquids, the advantages and disadvantages of these ILs as well as the absorption mechanisms are reviewed. There are three kinds of absorption mechanisms, including physical absorption, chemical absorption or both,which depend on the kind of ILs. Molecular dynamics simulation and others kinds of computational methods have become an important means to provide valuable insights into the structure-property quantitative relationship. Other issues such as ionic liquids for SO2 separation at a high temperature and the absorption mechanism have to be further investigated.%离子液体(ILs)具有独特的物理化学性质,在烟气脱硫领域引起了广泛的关注.本文综述了近年来离子液体在脱硫方面的研究进展,介绍了离子液体(ILs)的特点和用于烟气脱硫的优势,评述了胍类、醇胺类、咪唑类和己内酰胺类等脱硫离子液体的溶解性能、吸收机理以及优缺点.ILs吸收SO2有物理吸收、化学吸收以及二者同时存在的3种机理,与具体所用ILs的种类有关.阐述了分子动力学模拟等计算方法是研究ILs结构和性质之间的定量关系的一个重要方法和手段.高温离子液体烟气脱硫技术及其吸收机理仍需进一步深入研究.
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