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离子液体具有极低的挥发性、良好的热稳定性和化学稳定性以及结构性质可调等特点,被认为是一种环境友好的溶剂。由于其结构性质可调,可以设计合成出对SO2有较高溶解能力和选择性的离子液体,在SO2的吸收和分离领域得到了研究者的青睐。本文综述了各种用于分离捕集烟气和混合气体中SO2的离子液体,介绍了它们的结构特点、吸收特性和强化方法,探讨了离子液体脱硫的相关机理,最后对离子液体吸收分离SO2中存在的问题、发展方向和应用前景进行了论述。
Ionic liquids with low volatility, good thermal and chemical stability and structural properties of adjustable features, is considered to be an environmentally friendly solvent. Due to its tunable structure, an ionic liquid with high solvency and selectivity for SO2 can be designed and synthesized, attracting researchers’ attention in the field of SO2 absorption and separation. In this paper, various kinds of ionic liquids for separating and capturing SO2 in flue gas and mixed gas are reviewed. Their structural characteristics, absorption characteristics and strengthening methods are introduced. The relevant mechanisms of desulfurization of ionic liquids are discussed. Finally, In the existing problems, the development direction and application prospects are discussed.