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

Isobaric Vapor-Liquid Equilibria for Water + Acetic Acid + Sodium Acetate

Vercher, E.[Ernesto], Vazquez, M. I.[M. Isabel], Martinez-Andreu, A.[Antoni]
J. Chem. Eng. Data 2003, 48, 2, 217-220
ABSTRACT
Isobaric vapor-liquid equilibria for the binary water + sodium acetate and acetic acid + sodium acetate systems and ternary mixtures of water, acetic acid, and sodium acetate have been measured at 100 kPa with a recirculating still. The addition of sodium acetate to water + acetic acid mixtures produced an appreciable rise in equilibrium temperature but a small effect on the relative volatility of water, which was augmented at higher water solvent concentrations and decreased at lower concentrations. These effects increased with higher salt concentrations. The experimental binary data sets have been correlated using a modified Mock's electrolyte NRTL model, which takes into account the association of the acetic acid in the vapor phase by means of Marek's Chemical Theory (eNRTL-CT model). The estimated model parameters from binary data have been used to predict the ternary vapor-liquid equilibrium. The values obtained in this way agreed well with the experimental values.
Compounds
# Formula Name
1 H2O water
2 C2H4O2 acetic acid
3 C2H3NaO2 sodium ethanoate
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
  • 1
  • Mole fraction - 3 ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Gas
  • OTHER
  • 22
  • POMD
  • 2
  • 3
  • Mole fraction - 3 ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Gas
  • OTHER
  • 38
  • POMD
  • 2
  • 3
  • 1
  • Mole fraction - 3 ; Liquid
  • Temperature, K; Liquid
  • Solvent: Mole fraction - 1; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Gas
  • OTHER
  • 173
  • POMD
  • 2
  • 3
  • 1
  • Mole fraction - 1 ; Gas
  • Temperature, K; Gas
  • Solvent: Mole fraction - 1; Liquid
  • Pressure, kPa; Gas
  • Gas
  • Liquid
  • OTHER
  • 173