Thermodynamics Research Center / ThermoML | Thermochimica Acta

Liquid-liquid equilibrium phase behavior of iminazolium-based ionic liquid aqueous two-phase systems composed of 1-alkyl-3-methyl imidazolium tetrafluoroborate and different electrolytes ZnSO4, MgSO4 and Li2SO4 at 298.15 K: Experimental and correlation

Wang, Y.[Yun], Han, J.[Juan], Hu, Y.[Yutao], Sheng, C.[Chengzhuo], Wu, Y.[Yingchun]
Thermochim. Acta 2013, 557, 68-76
ABSTRACT
Ionic liquid-based aqueous two-phase systems offer an attractive alternative to volatile organic solvents in liquid-liquid extraction. In this work, the phase diagrams of the 1-alkyl-3-methyl imidazolium tetrafluoroborate ([C2mim]BF4/[C4mim]BF4) + ZnSO4/MgSO4/Li2SO4 + H2O ATPSs were determined at 298.15 K. Three empirical equations were used to correlate the binodal data and the optimum equation was selected. The effective excluded volume (EEV) values obtained from the binodal model for these systems were determined. The EEV and the binodal curves plotted in molality both indicate that the salting-out abilities of the three salts while the phase- [C2mim]BF4. Finally, the liquid-liquid equilibrium data were successfully correlated by the Othmer- Tobias and Bancroft equations, and a simply two parameter equation, meanwhile the slope of tie line increased with an increase in cation alkyl chain length.
Compounds
# Formula Name
1 C6H11BF4N2 1-ethyl-3-methylimidazolium tetrafluoroborate
2 C8H15BF4N2 1-butyl-3-methylimidazolium tetrafluoroborate
3 O4SZn zinc sulfate
4 MgO4S magnesium sulfate
5 Li2O4S lithium sulfate
6 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
  • 6
  • 3
  • 1
  • Mass fraction - 3 ; Liquid mixture 1
  • Mass fraction - 1; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 36
  • POMD
  • 6
  • 3
  • 1
  • Mass fraction - 3 ; Liquid mixture 1
  • Mass fraction - 1 ; Liquid mixture 2
  • Mass fraction - 3 ; Liquid mixture 2
  • Mass fraction - 1; Liquid mixture 1
  • Temperature, K; Liquid mixture 2
  • 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
  • 4
  • POMD
  • 4
  • 6
  • 1
  • Mass fraction - 4 ; Liquid mixture 1
  • Mass fraction - 1; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 31
  • POMD
  • 4
  • 6
  • 1
  • Mass fraction - 1 ; Liquid mixture 2
  • Mass fraction - 4 ; Liquid mixture 1
  • Mass fraction - 1 ; Liquid mixture 1
  • Mass fraction - 4; Liquid mixture 2
  • Temperature, K; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 2
  • Liquid mixture 1
  • Index of refraction calibration data
  • Index of refraction calibration data
  • Index of refraction calibration data
  • 4
  • POMD
  • 6
  • 5
  • 1
  • Mass fraction - 5 ; Liquid mixture 1
  • Mass fraction - 1; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 33
  • POMD
  • 6
  • 5
  • 1
  • Mass fraction - 5 ; Liquid mixture 2
  • Mass fraction - 5 ; Liquid mixture 1
  • Mass fraction - 1 ; Liquid mixture 1
  • Mass fraction - 1; Liquid mixture 2
  • Temperature, K; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 2
  • Liquid mixture 1
  • Index of refraction calibration data
  • Index of refraction calibration data
  • Index of refraction calibration data
  • 4
  • POMD
  • 6
  • 3
  • 2
  • Mass fraction - 3 ; Liquid mixture 1
  • Mass fraction - 2; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 36
  • POMD
  • 6
  • 3
  • 2
  • Mass fraction - 3 ; Liquid mixture 2
  • Mass fraction - 3 ; Liquid mixture 1
  • Mass fraction - 2 ; Liquid mixture 1
  • Mass fraction - 2; Liquid mixture 2
  • Temperature, K; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 2
  • Liquid mixture 1
  • Index of refraction calibration data
  • Index of refraction calibration data
  • Index of refraction calibration data
  • 4
  • POMD
  • 4
  • 6
  • 2
  • Mass fraction - 4 ; Liquid mixture 1
  • Mass fraction - 2; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 35
  • POMD
  • 4
  • 6
  • 2
  • Mass fraction - 2 ; Liquid mixture 2
  • Mass fraction - 4 ; Liquid mixture 1
  • Mass fraction - 2 ; Liquid mixture 1
  • Mass fraction - 4; Liquid mixture 2
  • Temperature, K; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 2
  • Liquid mixture 1
  • Index of refraction calibration data
  • Index of refraction calibration data
  • Index of refraction calibration data
  • 4
  • POMD
  • 6
  • 5
  • 2
  • Mass fraction - 5 ; Liquid mixture 1
  • Mass fraction - 2; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 36
  • POMD
  • 6
  • 5
  • 2
  • Mass fraction - 2 ; Liquid mixture 2
  • Mass fraction - 5 ; Liquid mixture 1
  • Mass fraction - 2 ; Liquid mixture 1
  • Mass fraction - 5; Liquid mixture 2
  • Temperature, K; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 2
  • Liquid mixture 1
  • Index of refraction calibration data
  • Index of refraction calibration data
  • Index of refraction calibration data
  • 4