Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

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

Yim, J.-H.[Jun-Hyuk], Song, H. N.[Ha Na], Lee, B.-C.[Byung-Chul], Lim, J. S.[Jong Sung]
Fluid Phase Equilib. 2011, 308, 1-2, 147-152
ABSTRACT
This paper presents bubble-point pressure data for CO2 in ionic liquids 1-hexyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([HMP][Tf2N]) and 1-octyl-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([OMP][Tf2N]) at pressures up to approximately 62 MPa and temperatures between 303.15 and 373.15 K. The solubility of CO2 in ionic liquids was measured with a high-pressure variable-volume view cell. At high CO2 concentrations in ionic liquids, the equilibrium pressure increased sharply with increasing CO2 concentrations while the solubility of CO2 in the ionic liquids decreased commensurate to increases in temperature. We have observed that in the [Tf2N] anion-based ionic liquids, the shorter the alkyl group chain in cation is, the larger the solubility of CO2 in ionic liquid become. The experimental data for the CO2 + ionic liquid system were relatively well correlated using the Peng-Robinson equation of state.
Compounds
# Formula Name
1 C13H24F6N2O4S2 1-hexyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide
2 C15H28F6N2O4S2 1-methyl-1-octylpyrrolidinium bis(trifluoromethylsulfonyl)amide
3 CO2 carbon dioxide
Datasets
The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type Compound-# Property Variable Constraint Phase Method #Points
  • POMD
  • 3
  • 1
  • Vapor or sublimation pressure, kPa ; Liquid
  • Mole fraction - 3; Liquid
  • Temperature, K; Liquid
  • Liquid
  • Gas
  • variable volume cell
  • 64
  • POMD
  • 3
  • 2
  • Vapor or sublimation pressure, kPa ; Liquid
  • Mole fraction - 3; Liquid
  • Temperature, K; Liquid
  • Liquid
  • Gas
  • variable volume cell
  • 72