Application of Ionic Liquids in gas separation: CO2 Capture
Volume Title: 1
1School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology, Tehran, Iran
2Departman of Chemical Engineering Amirkabir University of Technology, Tehran, Iran
Environmental aspects are the main motivation for research on energy efficient processes and the search for environment friendly materials for CO2 capture. In this paper, application of the one of the newest material, i.e. ionic liquids, for pollutant gases adsorption is reviewed. Currently, CO2 is captured by organic solvents liquids that are very energy intensive and less attractive from an environmental point of view led to emissions of the applied volatile solvent components. Ionic liquids have been proposed as a hopeful alternative to the common volatile solvents, because of their low volatility and other interesting properties. This notable interest has due to a sharp growth of literature on this specific subject. The aim of the present paper is to provide a detailed overview of the achievements and difficulties that has been encountered in finding a suitable ionic liquid for CO2 capture. The effect of anions, cations and functional groups on the CO2 solubility of the ionic liquids are highlighted. Recent developments on methods of membrane preparation including ionic are also discussed. Furthermore, ionic liquids can play an important role in acidic and alkaline gas separation. Ionic liquids could also solve the drawbacks of the classical solvents like high energy consumption and subsidiary contamination. In this study, introduction with ionic salts is initially investigated. Different types of ionic liquids membrane and their strengths and weaknesses were also studied. Thereafter, structure, particular properties and applications of ionic liquids are studied, respectively and the results of some papers in this realm are demonstrated.