High pressure solubility of methane in the ionic liquid 1-hexyl-3-methylimidazolium tricyanomethanide

M. Althuluth, M.C. Kroon, C.J. Peters

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    Abstract

    In this paper, new experimental measurements of methane (CH4) solubility in the ionic liquid (IL) 1-hexyl-3-methylimidazolium tricyanomethanide ([hmim][TCM]) are presented. The solubility data were obtained using a synthetic method based on bubble-point pressure measurements for concentrations ranging from (2–10) CH4 mole% and within a temperature range of (293–363 K) and pressures up to 10 MPa. The results obtained in this work were compared with those obtained for other ILs. The IL [hmim][TCM] was found to show the lowest CH4 solubility, which is desired for application of this IL as gas sweetening solvent (low co-absorption of hydrocarbons). Moreover, the CH4 solubility was compared to the CO2 solubility in the same IL, showing that [hmim][TCM] can selectively absorb CO2 from natural gas. The experimental solubility data of CH4 in [hmim][TCM] were accurately modeled using the PR-EoS with only one temperature-independent binary interaction parameter.

    Original languageEnglish
    Pages (from-to)145-148
    Number of pages4
    JournalJournal of Supercritical Fluids
    Volume128
    DOIs
    Publication statusPublished - 1 Oct 2017

    Keywords

    • 1-Hexyl-3-methylimidazolium tricyanomethanide
    • High pressure
    • Ionic liquid
    • Methane
    • PR-EoS
    • Solubility

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