Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Solubility of CO2 in 1-(2-hydroxyethyl)-3-methylimidazolium ionic liquids with different anions

Jalili, A. H.[Amir Hossein], Mehdizadeh, A.[Ali], Shokouhi, M.[Mohammad], Sakhaeinia, H.[Hossein], Taghikhani, V.[Vahid]
J. Chem. Thermodyn. 2010, 42, 6, 787-791
ABSTRACT
The solubility of carbon dioxide in a series of 1-(2-hydroxyethyl)-3-methylimidazolium ([hemim]+) based ionic liquids (ILs) with different anions, viz. hexafluorophosphate ([PF6]- ), trifluoromethanesulfonate ([OTf]- ), and bis-(trifluoromethyl)sulfonylimide ([Tf2N]- ) at temperatures ranging from 303.15 K to 353.15 K and pressures up to 1.3 MPa were determined. The solubility data were correlated using the Krichevsky-Kasarnovsky equation and Henry's law constants were obtained at different temperatures. Using the solubility data, the partial molar thermodynamic functions of solution such as Gibbs free energy, enthalpy, and entropy were calculated. Comparison showed that the solubility of CO2 in the ILs studied follows the same behaviour as the corresponding conventional 1-ethyl-3-methylimidazolium ([emim]+) based ILs with the same anions, i.e. [hemim][NTf2] greater than [hemim][OTf] greater than [hemim][PF6] greater than [hemim][BF4].
Compounds
# Formula Name
1 CO2 carbon dioxide
2 C6H11F6N2OP 3-(2-hydroxyethyl)-1-methylimidazolium hexafluorophosphate
3 C7H11F3N2O4S 3-(2-hydroxyethyl)-1-methylimidazolium 1,1,1-trifluoromethanesulfonate
4 C8H11F6N3O5S2 1-(2-hydroxyethyl)-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide
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
  • 1
  • 2
  • Mole fraction - 1 ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Gas
  • Phase equilibration
  • 44
  • POMD
  • 1
  • 3
  • Mole fraction - 1 ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Gas
  • Phase equilibration
  • 33
  • POMD
  • 1
  • 4
  • Mole fraction - 1 ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Gas
  • Phase equilibration
  • 40