Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Vapor-liquid equilibrium of the (water + ethanol + glycerol) system: Experimental and modelling data at normal pressure

Souza, W. L. R.[Wagner L.R.], Silva, C. S.[Camila S.], Meleiro, L. A. C.[Luiz A.C.], Mendes, M. F.[Marisa F.]
J. Chem. Thermodyn. 2013, 67, 106-111
ABSTRACT
In this work, vapor-liquid equilibrium data of the ethanol water glycerol system were measured in an Othmer-type ebulliometer at normal pressure. The choice for this system was due to the importance of the ethanol water separation. The samples analyses were done in a digital densimeter, and the methodology was previously validated with data available in the literature. Since the mean relative deviation was less than 5% in temperature and vapor composition, new data from mixtures of ethanol water glycerol were obtained. The experiments showed that glycerol is a promising solvent to ethanol dehydration since it eliminates the azeotrope and promotes the production of anhydrous ethanol. A thermodynamic model for this system was developed using the NRTL model to describe the non-ideality of the liquid phase. The modeling results were compared with experimental data and the deviations were lower than 7%. In this way, the model developed in this work can be used for simulation of ethanol dehydration.
Compounds
# Formula Name
1 H2O water
2 C2H6O ethanol
3 C3H8O3 glycerol
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
  • Normal boiling temperature, K ; Liquid
  • Liquid
  • Gas
  • Ebulliometric method (Recirculating still)
  • 1
  • POMD
  • 2
  • Normal boiling temperature, K ; Liquid
  • Liquid
  • Gas
  • Ebulliometric method (Recirculating still)
  • 1
  • POMD
  • 3
  • 2
  • 1
  • Mole fraction - 1 ; Liquid
  • Mole fraction - 1 ; Gas
  • Mole fraction - 2 ; Gas
  • Temperature, K; Liquid
  • Mole fraction - 2; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Gas
  • Density calibration data
  • Density calibration data
  • Density calibration data
  • 27