Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Polyethylene glycol (1500 or 600) - potassium tartrate aqueous twophase systems

Gonzalez-Amado, Marlen, Rodil, Eva, Arce, Alberto, Soto, Ana, Rodriguez, Oscar
Fluid Phase Equilib. 2018, 470, 120-125
ABSTRACT
Potassium tartrate solubility in water was measured and the aqueous biphasic system formed by this organic salt and PEG (1500 or 600) were characterized experimentally at 278.15, 293.15 and 308.15 K by measuring the composition of the equilibrium phases. The experimental binodal curves and the tie-lines were correlated using Merchuk and Guan equations. As expected for polymer-salt Aqueous Two-Phase Systems, the heterogeneous region increases with temperature and polymer molecular weight. Their effects on the phase behavior are discussed and related to the models' parameters.
Compounds
# Formula Name
1 C4H4K2O6 dipotassium L-tartrate
2 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
  • 1
  • 2
  • Mass fraction - 1 ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Crystal - 1
  • Density calibration data
  • 10
  • POMD
  • 1
  • 2
  • Mass density, kg/m3 ; Liquid
  • Mass fraction - 1; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Vibrating tube method
  • 8