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

ABSTRACT

The present work aims at establishing reliable activity coefficient model for the ternary systems water + ethanol + ethylene glycol, water + 2-propanol + ethylene glycol, and water + 1-propanol + ethylene glycol. Isobaric VLE data were reported for the ternary systems and for the binary system of water + ethylene glycol at 101.3 kPa. The NRTL equation was used for the modeling. Literature values of binary parameters for water + ethanol, water + 2-propanol, and water + 1-propanol, which were obtained in the modeling of the ternary systems containing glycerol, were used in this work. For the binary pair water + ethylene glycol, a unique set of binary parameters were used for all of the three ternary systems. Using the model parameters obtained, calculated results were in good agreement with the experimental values. The correlation indicated that the minimum mole fractions of ethylene glycol for breaking the azeotrope of water + ethanol, water + 2-propanol, and water + 1-propanol were, respectively, 0.072, 0.240, and 0.550. Comparisons were presented for experimental results and correlations available in the literature.