Solubility of CO2 in dialkylimidazolium dialkylphosphate ionic liquids

Title
Solubility of CO2 in dialkylimidazolium dialkylphosphate ionic liquids
Authors
젤리아코강제은뉴엔딘퀀김진형민병권이상득김홍곤김훈식
Keywords
CO2; ionic liquids; dialkylimidazolium dialkylphosphate; absorption
Issue Date
2009-09
Publisher
Thermochimica acta
Citation
VOL 494, NO 1-2, 94-98
Abstract
The solubility of carbon dioxide in room temperature ionic liquids (RTILs), dialkylimidazolium dialkylphosphates, was measured at 313–333K 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 dialkylphosphate 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 dibutylphosphate ([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]).
URI
http://pubs.kist.re.kr/handle/201004/35880
ISSN
0040-6031
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KIST Publication > Article
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