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Progress in Chemistry 2011, Vol. 23 Issue (10): 2031-2037 Previous Articles   Next Articles

• Review •

Absorption and Separation of SO2 by Ionic Liquids

Hou Yucui1, Ren Shuhang2, Wu Weize2*   

  1. 1. Department of Chemistry, Taiyuan Normal University, Taiyuan 030031, China;
    2. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
  • Received: Revised: Online: Published:
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Room-temperature ionic liquids (ILs), which have excellent properties, such as extremely low vapor pressure, high thermal and chemical stability and tunable structures, are regarded as environmentally benign solvents. Due to their tunable structures and properties, ILs can be designed to endow with a high solvent power for SO2 absorption and separation, and they have been widely investigated in SO2 absorption and separation by many researchers. The paper briefly introduces the characters of ILs used for SO2 capture and separation from flue gas or mixed gas, the capacity of SO2 absorption in these ILs, the ways to enhance the absorption of SO2, and the mechanism of the absorption. Furthermore, the application prospect of the absorption by ILs is presented, and the existing problems and the further studies are discussed.

Contents
1 Introduction
2 Ionic liquids for absorption and separation of SO2 and their improvements
2.1 Guanidinium based ionic liquids
2.2 Hydroxyl ammonium based ionic liquids
2.3 Imidazolium and pyridinium based ionic iiquids
2.4 Quaternary ammonium based ionic liquids
2.5 Supported ionic liquids
2.6 Polymerized ionic liquids
3 Mechanism of SO2 absorption by ionic liquids
4 Effects of the components of flue gas on desulphurization by ionic liquids
5 Conclusions and outlook

Key words: ionic liquids, SO2, separation, absorption, mechanism

CLC Number: 

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