Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Phase Diagrams for the Aqueous Two-Phase Ternary System Containing the Ionic Liquid 1-Butyl-3-methylimidazolium Bromide and Tri-potassium Citrate at T ) (278.15, 298.15, and 318.15) K

Zafarani-Moattar, M. T.[Mohammed Taghi], Hamzehzadeh, S.[Sholeh]
J. Chem. Eng. Data 2009, 54, 3, 833-841
ABSTRACT
Liquid-liquid equilibria (LLE) for the aqueous 1-butyl-3-methylimidazolium bromide ([C4mim]Br) + tripotassium citrate system have been experimentally determined at T ) (278.15, 298.15, and 318.15) K. An empirical nonlinear expression developed by Merchuk was used for reproducing the experimental binodal data. In this work, the three fitting parameters of the Merchuk equation were obtained with the temperature dependence expressed in the linear form with (T - T0) K as a variable. The effect of temperature on the phase-forming ability in the investigated system has also been studied on the basis of a salting-out coefficient obtained from fitting the tie-line data to a Setschenow-type equation for each temperature. The values of the salting-out coefficients may reflect the extent of the preferential hydration of the ionic liquid. Furthermore, the kosmotropicity of tri-potassium citrate for the exclusion of [C4mim][Br] in an aqueous solution has been examined in comparison with the previously studied kosmotropic salts on the basis of the ionic viscosity B coefficients of salt constituent anions and the preferential hydration of the ionic liquid.
Compounds
# Formula Name
1 C8H15BrN2 1-butyl-3-methylimidazolium bromide
2 C6H5K3O7 potassium citrate
3 H2O water
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
  • 2
  • 3
  • 1
  • Mass fraction - 2 ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Mass fraction - 1; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Index of refraction calibration data
  • 127
  • POMD
  • 2
  • 3
  • 1
  • Mass fraction - 2 ; Liquid mixture 1
  • Mass fraction - 1 ; Liquid mixture 2
  • Mass fraction - 2 ; Liquid mixture 2
  • Temperature, K; Liquid mixture 1
  • Mass fraction - 1; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 1
  • Liquid mixture 2
  • Index of refraction calibration data
  • Index of refraction calibration data
  • Index of refraction calibration data
  • 19