Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Evaluation of salting-out effect in the liquid-liquid equilibrium of aqueous two-phase systems composed of 2-propanol and Na2SO4/ MgSO4 at different temperatures

Pimentel, J. G.[Juliana Gomes], Bicalho, S. F.[Silvana Ferreira], Gandolfi, O. R. R.[Olga Reinert Ramos], Castro, S. d. S.[Sergio de Sousa], Souza, E. A.[Erik Almeida], Veloso, C. M.[Cristiane Martins], Verissimo, L. A. A.[Lizzy Ayra Alcantara], Fontan, R. d. C. I.[Rafael da Costa Ilheu], Sampaio, V. S.[Vanessa Santos], Bonomo, R. C. F.[Renata Cristina Ferreira]
Fluid Phase Equilib. 2017, 450, 184-193
ABSTRACT
Liquid-liquid equilibrium data (LLE) were obtained for aqueous two-phase systems (ATPS) composed of 2-propanol + inorganic salt (Na2SO4 or MgSO4) + water, at different temperatures T = (293.15, 303.15, 313.15, 323.15) K. The effect of temperature on the binodal curves and tie-lines was studied. Temperature increase resulted in an expansion of the biphasic region, and this effect was more pronounced in the systems composed of 2-propanol + Na2SO4. A nonlinear equation was used to describe the binodal curves in terms of the mass fraction of 2-propanol versus sulfate salt. The effects of the different salts (Na2SO4 or MgSO4) on the phase-separation abilities of the studied ATPS was discussed using the values of parameters in the effective excluded volume (EEV) model. The salting-out abilities of the investigated salts followed the order Na2SO4 greater than MgSO4. The experimental results of LLE were correlated using the UNIFAC model. Calculated RMS deviations between the experimental and predicted LLE compositions for the 2-propanol + Na2SO4 and 2-propanol + MgSO4 systems were 1.76 and 0.68%, respectively. The UNIFAC model was able to effectively represent the studied biphasic aqueous systems.
Compounds
# Formula Name
1 MgO4S magnesium sulfate
2 Na2O4S sodium sulfate
3 C3H8O propan-2-ol
4 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
  • 3
  • 4
  • 2
  • Mass fraction - 2 ; 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
  • 103
  • POMD
  • 3
  • 4
  • 2
  • Mass fraction - 2 ; Liquid mixture 2
  • Mass fraction - 2 ; Liquid mixture 1
  • Mass fraction - 3 ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Mass fraction - 3; Liquid mixture 2
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 2
  • Liquid mixture 1
  • OTHER
  • OTHER
  • OTHER
  • 12
  • POMD
  • 3
  • 1
  • 4
  • 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
  • 113
  • POMD
  • 3
  • 1
  • 4
  • 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 2
  • Liquid mixture 1
  • Liquid mixture 2
  • OTHER
  • OTHER
  • OTHER
  • 12