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
AbstractThe 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.
|Journal series||Journal of Physical Chemistry B, ISSN 1520-6106|
|Publication indicators||: 2011 = 3.696 (2) - 2011=4.061 (5)|
|Citation count*||2 (2013-01-30)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.