REPRESENTATION OF ELECTROLYTE SOLUTION PROPERTIES BY MEANS OF THE PENG-ROBINSON-STRYJEK-VERA EQUATION OF STATE

The Peng-Robinson-Stryjek-Vera equation of state (Stryjek, R.; Vera J. H. Can. J. Chem. Eng. 1986, 64, 334-340) was used with the Wong-Sandl er mixing rule (1992) and the activity coefficient model of Chen et al . (AIChE J. 1982, 28, 588-596) to calculate osmotic coefficients and v apor-liquid equilibrium (VLE) values of electrolyte solutions. The osm otic coefficients calculated by this approach agree with those calcula ted from the original Chen model. The approach was also used to repres ent VLE for three ethanol-water-salt systems. The average absolute dev iations of the calculated temperatures were around 1 K, and those of t he calculated vapor-phase compositions were between 0.01 and 0.02 mole fraction.