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High-pressure phase behavior of binary mixtures containing ionic liquid [HMP][Tf2N], [OMP][Tf2N] and carbon dioxide

Authors
Journal
Fluid Phase Equilibria
0378-3812
Publisher
Elsevier
Publication Date
Volume
308
Identifiers
DOI: 10.1016/j.fluid.2011.06.023
Keywords
  • Solubility
  • Ionic Liquid
  • Carbon Dioxide
  • [Hmp][Tf2N]
  • [Omp][Tf2N]

Abstract

Abstract This paper presents bubble-point pressure data for CO 2 in ionic liquids 1-hexyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([HMP][Tf 2N]) and 1-octyl-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([OMP][Tf 2N]) at pressures up to approximately 62 MPa and temperatures between 303.15 and 373.15 K. The solubility of CO 2 in ionic liquids was measured with a high-pressure variable-volume view cell. At high CO 2 concentrations in ionic liquids, the equilibrium pressure increased sharply with increasing CO 2 concentrations while the solubility of CO 2 in the ionic liquids decreased commensurate to increases in temperature. We have observed that in the [Tf 2N] anion-based ionic liquids, the shorter the alkyl group chain in cation is, the larger the solubility of CO 2 in ionic liquid become. The experimental data for the CO 2 + ionic liquid system were relatively well correlated using the Peng–Robinson equation of state.

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