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Isobaric vapor-liquid equilibria for the binary systems allyl alcohol-toluene and toluene-benzaldehyde were measured at 760 ± 1 mmHg pressure by using a modified Jones vapor reclrculatory still. The system allyl alcohol-toluene has shown positive deviations from Raoult's law. Redllch-KIster, Wilson, NRTL, and UNIQUAC models were employed to correlate the experimental data. The system toluene-benzaldehyde was nearly Ideal In-its behavior, and the data were correlated by the method of Hlrata.

Vapor-liquid equilibrium data for two binary Iso alcohol-tetrachloroethene systems are measured at 760 mmHg pressure, these two systems are nonideal In behavior and show positive deviations from Raoult's law. The data are correlated by the Margules, Van Laar, Wilson, NRTL, and UNIQUAC equations.In order to develop predictive methods for vapor-liquid equilibria, a continuing study on various binary systems is in progress at this laboratory. As part of this, two binary systems comprising either 2-methyl-1 -propanol or 3-methyl-1-butanol in a common solvent, tetrachloroethene, were studied at 760 ± 1 mmHg pressure. Experimental SectionPurity of Chemicals. The iso alcohols and tetrachloroethene were of reagent grade and were further purified in a laboratory-packed distillation column. The physical properties of these chemicals are presented in Table I. These values compare well with the literature values (16).