Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Phase behaviour for aqueous two-phase systems containing the ionic liquid 1-butylpyridinium tetrafluoroborate /1-butyl-4-methylpyridinium tetrafluoroborate and organic salts (sodium tartrate/ammonium citrate/trisodium citrate) at different temperatures

Li, Y.[Yuliang], Zhang, M.[Mengshi], Liu, Q.[Qian], Su, H.[Hang]
J. Chem. Thermodyn. 2013, 66, 80-87
ABSTRACT
The binodal curves of 1-butylpyridinium tetrafluoroborate + sodium tartrate at T = (298.15, 308.15 and 328.15) K and 1-butyl-4-methylpyridinium tetrafluoroborate + sodium tartrate/ammonium citrate/trisodium citrate at T = 298.15 K were experimentally determined. Three empirical equations were used to correlate the binodal data. The tie-line data were successfully correlated using the Othmer Tobias and Bancroft and two-parameter equations. Factors affecting the binodal curves, such as temperature and the nature of the ionic liquids, were also studied. The two-phase area expanded with a decrease in temperature, whereas the absolute value of the slope of the ties slightly decreased with an increase in temperature. With an increase in the alkyl chain length of the ionic liquids (ILs) in the investigated systems, the binodal curves shifted closer to the origin. Finally, the effective excluded volume (EEV) values obtained from the binodal model were determined, and the salting-out ability decreased in the following order: Na3C6H5O7 greater than Na2C4H4O6 greater than (NH4)3C6H5O7.
Compounds
# Formula Name
1 C4H4Na2O6 disodium L-tartrate
2 H2O water
3 C9H14BF4N 1-butylpyridinium tetrafluoroborate
4 C10H16BF4N 1-butyl-4-methylpyridinium tetrafluoroborate
5 C6H17N3O7 ammonium 2-hydroxypropane-1,2,3-tricarboxylate
6 C6H5Na3O7 trisodium citrate
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
  • 3
  • Mass fraction - 1 ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Mass fraction - 3; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 190
  • POMD
  • 1
  • 2
  • 3
  • Mass fraction - 1 ; Liquid mixture 1
  • Mass fraction - 1 ; Liquid mixture 2
  • Mass fraction - 3 ; Liquid mixture 2
  • Temperature, K; Liquid mixture 2
  • Mass fraction - 3; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • atomic absorption spectroscopy
  • atomic absorption spectroscopy
  • atomic absorption spectroscopy
  • 9
  • POMD
  • 1
  • 2
  • 4
  • Mass fraction - 1 ; Liquid mixture 1
  • Mass fraction - 4; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 72
  • POMD
  • 1
  • 2
  • 4
  • Mass fraction - 1 ; Liquid mixture 1
  • Mass fraction - 1 ; Liquid mixture 2
  • Mass fraction - 4 ; Liquid mixture 2
  • Mass fraction - 4; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • atomic absorption spectroscopy
  • atomic absorption spectroscopy
  • atomic absorption spectroscopy
  • 3
  • POMD
  • 5
  • 2
  • 4
  • Mass fraction - 5 ; Liquid mixture 1
  • Mass fraction - 4; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 77
  • POMD
  • 5
  • 2
  • 4
  • Mass fraction - 5 ; Liquid mixture 1
  • Mass fraction - 5 ; Liquid mixture 2
  • Mass fraction - 4 ; Liquid mixture 2
  • Mass fraction - 4; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • atomic absorption spectroscopy
  • atomic absorption spectroscopy
  • atomic absorption spectroscopy
  • 3
  • POMD
  • 6
  • 2
  • 4
  • Mass fraction - 6 ; Liquid mixture 1
  • Mass fraction - 4; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 73
  • POMD
  • 6
  • 2
  • 4
  • Mass fraction - 6 ; Liquid mixture 2
  • Mass fraction - 6 ; Liquid mixture 1
  • Mass fraction - 4 ; Liquid mixture 1
  • Mass fraction - 4; Liquid mixture 2
  • Temperature, K; Liquid mixture 2
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 2
  • Liquid mixture 1
  • atomic absorption spectroscopy
  • atomic absorption spectroscopy
  • atomic absorption spectroscopy
  • 3