Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Liquid-liquid equilibria of aqueous two-phase systems of the ionic liquid brominated N-ethyl pyridine and sodium dihydrogen phosphate, sodium sulfate, ammonium citrate, and potassium tartrate at different temperatures: Experimental determination and correlation

Li, Y.-L.[Yu-Liang], Zhang, M.-S.[Meng-Shi], Su, H.[Hang], Liu, Q.[Qian], Guan, W.-S.[Wei-Sheng]
Fluid Phase Equilib. 2013, 341, 70-77
ABSTRACT
Liquid-liquid equilibrium data have been determined experimentally for aqueous two-phase systems of brominated N-ethyl pyridine ([EPy]Br) and sodium dihydrogen phosphate (NaH2PO4) at T = 298.15, 308.15, 318.15, and 328.15 K, and data have also been obtained for aqueous two-phase systems composed of [EPy]Br and sodium sulfate (Na2SO4), ammonium citrate (C6H5O7(NH4)3) or potassium tartrate (C4H4O6K2) at T = 298.15 K. The Merchuk equation was used to model the binodal data. The effects of temperature on the binodal curves and tie-lines were studied, and the two-phase area was found to expand with a decrease in temperature, while the slope of the tie lines slightly decreased with an increase in temperature. Furthermore, the effective excluded volume (EEV) values obtained from the binodal model for these systems were determined, and the salting-out abilities follow the order of Na2SO4 greater than NaH2PO4 greater than C4H4O6K2 greater than C6H5O7(NH4)3. The Othmer Tobias, Bancroft and several parameter equations were used to determine the correlations of the tie-line data. These models agreed well with the experimental tie-line data.
Compounds
# Formula Name
1 C7H10BrN 1-ethylpyridinium bromide
2 H2NaO4P sodium dihydrogen phosphate
3 H2O water
4 Na2O4S sodium sulfate
5 C6H17N3O7 ammonium 2-hydroxypropane-1,2,3-tricarboxylate
6 C4H4K2O6 dipotassium meso-tartrate
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 - 2; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 423
  • POMD
  • 1
  • 2
  • 3
  • Mass fraction - 2 ; Liquid mixture 1
  • Mass fraction - 2 ; Liquid mixture 2
  • Mass fraction - 1 ; 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
  • Titration method
  • Titration method
  • Titration method
  • 3
  • POMD
  • 1
  • 3
  • 4
  • Mass fraction - 1 ; Liquid mixture 1
  • Mass fraction - 4; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 41
  • POMD
  • 1
  • 3
  • 4
  • Mass fraction - 4 ; Liquid mixture 2
  • Mass fraction - 4 ; Liquid mixture 1
  • Mass fraction - 1 ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Mass fraction - 1; Liquid mixture 2
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 2
  • Liquid mixture 1
  • Titration method
  • Titration method
  • Titration method
  • 12
  • POMD
  • 1
  • 5
  • 3
  • Mass fraction - 1 ; Liquid mixture 1
  • Mass fraction - 5; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 90
  • POMD
  • 1
  • 5
  • 3
  • 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 2
  • Liquid mixture 2
  • Liquid mixture 1
  • Titration method
  • Titration method
  • Titration method
  • 3
  • POMD
  • 1
  • 6
  • 3
  • Mass fraction - 1 ; Liquid mixture 1
  • Mass fraction - 6; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 95
  • POMD
  • 1
  • 6
  • 3
  • Mass fraction - 6 ; Liquid mixture 2
  • Mass fraction - 6 ; Liquid mixture 1
  • Mass fraction - 1 ; Liquid mixture 1
  • Mass fraction - 1; Liquid mixture 2
  • Temperature, K; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 2
  • Liquid mixture 1
  • Titration method
  • Titration method
  • Titration method
  • 3