Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Solubilities of Sodium Chloride and Potassium Chloride in Water + Ethanol Mixtures from (298 to 323) K

Farelo, F.[Fatima], Lopes, A. M. C.[Ana M. C.], Ferra, M. I.
J. Chem. Eng. Data 2004, 49, 6, 1782-1788
ABSTRACT
The solubilities of sodium chloride in water + ethanol mixtures and of sodium and potassium chlorides in systems of NaCl + KCl + water + ethanol were determined from (298 to 323) K and up to 20 mass % alcohol in the solvent. An empirical fit of the measured data enabled the calculation of the solubility of NaCl in water + ethanol mixtures as a function of temperature and alcohol content with an average deviation of 0.1 mass %. Solubility data in the quaternary systems were correlated using an algorithm that makes use of the Pitzer mole fraction-based equations for the activity coefficients of the electrolytes. The parameters for the activity coefficient equations, taken from the literature, allowed fair agreement between calculated and experimental solubilities in the NaCl field. However, in the KCl domain the deviations were somewhat biased. A better fit of the entire set of solubilities was obtained by revising the value of the short-range interaction parameter Q ethanol,NaCl,KCl. After this tuning, the algorithm reproduces the experimental solubility data of both salts with a standard deviation of ?0.023 mol?kgsolvent-1. The maximum differences between the experimental and calculated contents of sodium and potassium chlorides in the invariant composition mixtures are 1.2% and 3.5%, respectively.
Compounds
# Formula Name
1 ClNa sodium chloride
2 ClK potassium chloride
3 H2O water
4 C2H6O ethanol
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
  • 4
  • 1
  • 3
  • Molality, mol/kg - 1 ; Liquid
  • Temperature, K; Liquid
  • Solvent: Mass fraction - 4; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Crystal - 1
  • OTHER
  • 47
  • POMD
  • 4
  • 2
  • 3
  • Molality, mol/kg - 2 ; Liquid
  • Temperature, K; Liquid
  • Solvent: Mole fraction - 4; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Crystal - 2
  • OTHER
  • 8