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Solubility of H2S in 1-(2-hydroxyethyl)-3-methylimidazolium ionic liquids with different anions

Sakhaeinia, H ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. DOI: 10.1016/j.fluid.2010.08.027
  3. Publisher: 2010
  4. Abstract:
  5. The solubility of hydrogen sulfide in a series of 1-(2-hydroxyethyl)-3-methylimidazolium ([HOemim]+)-based ionic liquids (ILs) containing different anions, viz. hexafluorophosphate ([PF6]-), trifluoromethanesulfonate ([OTf]-), and bis-(trifluoromethyl)sulfonylimide ([Tf2N]-) at temperatures ranging from 303.15 to 353.15K and pressures of up to about 1.8MPa was measured by a volumetric based static apparatus. The solubility data were correlated using two models: (1) the Krichevsky-Kasarnovsky equation and (2) the extended Henry's law combined with the Pitzer's virial expansion for the excess Gibbs energy. Henry's law constants (at zero pressure) in mole-fraction and molality scales were obtained at different temperatures by means of these two models. Using the solubility data, the partial molar thermodynamic functions of solution, i.e. Gibbs energy, enthalpy, and entropy were calculated. Comparison showed that the solubility of H2S is greater than that of CO2 in the corresponding ILs studied in this work and that the solubility of both gases increases as the number of trifluoromethyl (-CF3) groups in the anion increases, i.e. the solubility behavior of both gases follows the order [HOemim][Tf2N]≥[HOemim][OTf]>[HOemim][PF6]>[HOemim][BF4]
  6. Keywords:
  7. Excess Gibbs energy ; Gas solubility ; Gibbs energy ; Henry's law ; Henry's law constant ; Hexafluorophosphates ; Molalities ; Solubility behavior ; Solubility data ; Thermodynamic functions ; Trifluoromethyl ; Virial expansion ; Zero pressure ; Gibbs free energy ; Hydrogen ; Hydrogen sulfide ; Negative ions ; Solubility ; Sulfur determination ; Ionic liquids
  8. Source: Fluid Phase Equilibria ; Volume 298, Issue 2 , November , 2010 , Pages 303-309 ; 03783812 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S037838121000453X