Solubility of CO2 in dialkylimidazolium dialkylphosphate ionic liquids

Jelliarko Palgunadi, Je Eun Kang, Dinh Quan Nguyen, Jin Hyung Kim, Byoung Koun Min, Sang Deuk Lee, Honggon Kim, Hoon Sik Kim

Research output: Contribution to journalArticlepeer-review

103 Citations (Scopus)


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 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]).

Original languageEnglish
Pages (from-to)94-98
Number of pages5
JournalThermochimica Acta
Issue number1-2
Publication statusPublished - 2009 Oct 10


  • CO capture
  • Dialkylimidazolium dialkylphosphate
  • Ionic liquids

ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry


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