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Solubility of Carbon Dioxide in Imidazolium-Based Ionic Liquids with a Methanesulfonate Anion

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Greenhouse Gas Research Center, Korea Institute of Energy Research, 71-2 Jang-dong, Yuseong-gu, Daejeon 305-343, Korea
Department of Chemical Engineering and Nano-Bio Technology, Hannam University, 461-6 Jeonmin-dong, Yuseong-gu, Daejeon 305-811, Korea
§ Department of Chemical and Biological Engineering, Korea University, 1 Anam-dong, Sungbuk-gu, Seoul 136-701, Korea
*E-mail: [email protected]. Tel.: +82-42-629-8838. Fax: +82-42-629-8835 (B.-C.L.). E-mail: [email protected]. Tel.: +82-42-860-3648. Fax: +82-42-860-3134 (I.-H.B.).
Cite this: J. Chem. Eng. Data 2012, 57, 12, 3321–3329
Publication Date (Web):November 14, 2012
Copyright © 2012 American Chemical Society

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    For the halide-free imidazolium-based ionic liquids with a methanesulfonate anion, the solubility results of carbon dioxide (CO2) are presented at pressures up to approximately 45 MPa and temperatures ranging from 303.15 K to 343.15 K. The solubility was determined by measuring bubble pressures of mixtures of CO2 and ionic liquid using a high-pressure equilibrium apparatus equipped with a variable-volume view cell. The ionic liquids studied in this work were 1,3-dibutylimidazolium methanesulfonate, 1-ethyl-3-methylimidazolium methanesulfonate, 1-butyl-3-methylimidazolium methanesulfonate, and 1,3-dimethylimidazolium methanesulfonate. A sharp increase of equilibrium pressure was observed at high CO2 compositions. In ionic liquids, the CO2 solubility was elevated according to the increase of the total length of alkyl chains linked to the imidazole of the ionic liquids, and this increase became more apparent at higher pressures. The ionic liquids with a methanesulfonate anion gave a lower CO2 solubility than the ionic liquids with a fluorinated substituent such a fluoroalkyl group on their anions.

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    Experimental procedure for synthesis of ionic liquid 1,3-dibutylimidazolium methanesulfonate ([dbim][MeSO3]); 1H NMR spectroscopic data of [dbim][MeSO3]. This material is available free of charge via the Internet at

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