Mutual solubility measurements and correlations of imidazolium-based ionic liquid mixtures with alcohols

Chayanaphat Chokradjaroen, Xiaoli Li, Kazuhiro Tamura

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6 Citations (Scopus)


The mutual solubility of ionic liquids (ILs), 1-butyl-3-ethylimidazolium tetrafluoroborate, 1-butyl-3-propylimidazolium tetrafluoroborate, and 1,3-dibutylimidazolium tetrafluoroborate with alcohols, 1-propanol, 1-butanol, 1-pentanol, and 1-hexanol were measured at atmospheric pressure. Upper critical solution temperatures (UCSTs) were estimated from experimental results using a polynomial equation. The UCSTs increased as increasing the chain length of alcohol. On other hand, the decreasing UCSTs occurred when the alkyl chain length on the cation of ionic liquids increased. The (liquid + liquid) equilibrium data were correlated by the original UNIQUAC, extended UNIQUAC, and modified UNIQUAC models. The temperature dependence of the solubility of ILs in alcohols and alcohols in ILs is represented successfully using the UNIQUAC, extended UNIQUAC, and modified UNIQUAC models with a quadratic function of temperature for binary energy parameters.

Original languageEnglish
Pages (from-to)72-79
Number of pages8
JournalJournal of Chemical Thermodynamics
Publication statusPublished - 2012 Mar 1



  • (Liquid + liquid) equilibrium
  • Alcohol
  • Imidazolium-based ionic liquid
  • Mutual solubility
  • UNIQUAC model

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Physical and Theoretical Chemistry

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