Solubility of CO2 in dialkylimidazolium dialkylphosphate ionic liquids
- Solubility of CO2 in dialkylimidazolium dialkylphosphate ionic liquids
- 젤리아코; 강제은; 뉴엔딘퀀; 김진형; 민병권; 이상득; 김홍곤; 김훈식
- CO2; ionic liquids; dialkylimidazolium dialkylphosphate; absorption
- Issue Date
- Thermochimica acta
- VOL 494, NO 1-2, 94-98
- 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]).
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