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

    109 Citations (Scopus)

    Abstract

    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
    Volume494
    Issue number1-2
    DOIs
    Publication statusPublished - 2009 Oct 10

    Bibliographical note

    Funding Information:
    This work was financially supported by National Energy Resources Technology Development R&D Program for Greenhouse Gas Mitigation under the Korea Ministry of Knowledge Economy. We also thank Mr. Arenst Andreas for his helpful discussion in obtaining thermodynamic data.

    Keywords

    • CO capture
    • Dialkylimidazolium dialkylphosphate
    • Ionic liquids

    ASJC Scopus subject areas

    • Instrumentation
    • Condensed Matter Physics
    • Physical and Theoretical Chemistry

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