Journal
THERMOCHIMICA ACTA
Volume 494, Issue 1-2, Pages 94-98Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.tca.2009.04.022
Keywords
CO2 capture; Ionic liquids; Dialkylimidazolium dialkylphosphate
Funding
- National Energy Resources Technology Development R&D Program for Greenhouse Gas Mitigation
- Korea Ministry of Knowledge Economy
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The solubility of carbon dioxide in room temperature ionic liquids (RTILs), dialkylimidazolium dialkylphosphates, was measured at 313-333 K and at pressures close to atmospheric pressure, from which Henry's law coefficients, standard Gibbs free energy, enthalpy, and entropy changes of solvation were derived. The CO2 solubility in the dialkylimidazolium dialkyl phosphate was found to increase with increasing chain length of the alkyl groups on the cation and/or the anion as was similarly found in other RTILs. Among various dialkylimidazolium dialkylphosphates tested, 1-ethyl-3-methylimidazolium diethylphosphate ([EMIM][Et2PO4]) and 1-butyl-3-methylimidazolium dibutyl phosphate ([BMIM][Bu2PO4]) exhibited the comparable or better capability of dissolving CO2 in comparison with that of [BMIM][BF4], but their absorption capacities were still lower than that of 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide([BMIM][Tf2N]). (C) 2009 Elsevier B.V. All rights reserved.
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