Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Vapour liquid liquid and vapour liquid equilibrium of the system water + ethanol + heptane at 101.3 kPa

Gomis, V.[Vicente], Font, A.[Alicia], Saquete, M. D.[Maria Dolores]
Fluid Phase Equilib. 2006, 248, 2, 206-210
ABSTRACT
Consistent vapour liquid (VLE) and vapour liquid liquid (VLLE) data for the ternary system water (1) + ethanol (2) + n-heptane (3) are reported at 101.3 kPa at temperatures in the range of 341 352 K. An all-glass, dynamic recirculating still equipped with an ultrasonic homogenizer has been used in the determination of the VLLE. The experimental data indicates that a ternary heterogeneous azeotrope is present at 341.83K with a composition of 0.205, 0.432, and 0.363 mole fractions of water, ethanol, and heptane, respectively. The experimental results have been used to test the accuracy of the UNIFAC, UNIQUAC, and NRTL models in the calculation and prediction of the equilibrium data. None of these methods properly correlate and approximate the top zone of the non-isothermal solubility curve, which is important for the simulation of the azeotropic distillation.
Compounds
# Formula Name
1 H2O water
2 C2H6O ethanol
3 C7H16 heptane
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
  • 2
  • 3
  • 1
  • Mole fraction - 2 ; Liquid mixture 1
  • Mole fraction - 2 ; Liquid mixture 2
  • Mole fraction - 2 ; Gas
  • Mole fraction - 1 ; Liquid mixture 1
  • Mole fraction - 1 ; Liquid mixture 2
  • Mole fraction - 1 ; Gas
  • Temperature, K; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Gas
  • GC and Karl Fischer for water in the organic phase
  • GC and Karl Fischer for water in the organic phase
  • GC and Karl Fischer for water in the organic phase
  • GC and Karl Fischer for water in the organic phase
  • GC and Karl Fischer for water in the organic phase
  • GC and Karl Fischer for water in the organic phase
  • 14