Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Liquid liquid equilibria for ternary systems of (ethylene glycol + toluene + heptane) at temperatures (303.15, 308.15, and 313.15) K and atmospheric pressure: Experimental results and correlation with UNIQUAC and NRTL models

Haghnazarloo, H.[Hamidreza], Lotfollahi, M. N.[Mohammad Nader], Mahmoudi, J.[Jafar], Asl, A. H.[Ali Haghighi]
J. Chem. Thermodyn. 2013, 60, 126-131
ABSTRACT
The liquid liquid equilibria (LLE) were measured for ternary mixtures of (ethylene glycol + toluene + n-heptane) under atmospheric pressure and at temperatures (303.15, 308.15, and 313.15) K. The experimental distribution coefficient and selectivity factor were obtained to evaluate the efficiency of the solvent for extraction of toluene from n-heptane. The degree of consistency of the experimental LLE results was validated by applying the Othmer Tobias equation. The LLE data of the studied mixtures were used to obtain binary interaction parameters in the NRTL and UNIQUAC models by minimizing the root mean square deviations (RMSD) between the experimental and the calculated results of two-phase compositions. The calculated compositions based on the UNIQUAC and NRTL models were found to be in good agreement with the experimental values. The results of the RMSD for the NRTL and UNIQUAC models are about 0.0144 and 0.0149, respectively.
Compounds
# Formula Name
1 C7H16 heptane
2 C7H8 toluene
3 C2H6O2 1,2-ethanediol
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
  • 2
  • 1
  • Mass fraction - 3 ; Liquid mixture 2
  • Mass fraction - 3 ; Liquid mixture 1
  • Mass fraction - 2 ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Mass fraction - 2; Liquid mixture 2
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 2
  • Liquid mixture 1
  • Chromatography
  • Chromatography
  • Chromatography
  • 16