Thermodynamics and Activity Coefficients at Infinite Dilution Measurements for Organic Solutes and Water in the Ionic Liquid N-Hexyl-3-methylpyridinium Tosylate

Urszula Domańska-Żelazna , Marek Królikowski


The activity coefficients at infinite dilution, γ13∞, for 44 solutes, including alkanes, cycloalkanes, alkenes, alkynes, aromatic hydrocarbons, alcohols, water, thiophene, tetrahydrofuran, ethers, and ketones in the ionic liquid (IL) N-hexyl-3-methylpyridinium tosylate (p-toluenesulfonate), [HM3Py][TOS], were determined by gas–liquid chromatography at temperatures from 338.15 to 368.15 K. The densities of [HM3Py][TOS] as a function of temperature have been measured at temperatures higher than the melting temperature and were extrapolated to T = 298.15 K. The gas–liquid partition coefficients, KL were calculated for all solutes. The partial molar excess Gibbs energies ΔG1E,∞, enthalpies ΔH1E,∞, and entropies ΔS1E,∞ at infinite dilution were calculated from the experimental γ13∞ values obtained over the temperature range. The selectivities for different separation problems including n-heptane/benzene, cyclohexane/benzene, and n-heptane/thiophene were calculated from γ13∞ and compared to literature values for tosylate-based ILs, or hexyl-substituted cations of ILs, or pyridynium-based IL, or N-methyl-2-pyrrolidinone (NMP), and sulfolane.
Author Urszula Domańska-Żelazna ZChF
Urszula Domańska-Żelazna,,
- Department Of Physical Chemistry
, Marek Królikowski ZChF
Marek Królikowski,,
- Department Of Physical Chemistry
Journal seriesJournal of Physical Chemistry B, ISSN 1520-6106
Issue year2011
Languageen angielski
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Score (nominal)30
Publication indicators WoS Impact Factor: 2011 = 3.696 (2) - 2011=4.061 (5)
Citation count*2 (2013-01-30)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.