Excess Gibbs free energies for binary systems. Isopropyl alcohol with benzene, cyclohexane, methylcyclohexane

Isothermal vapor-liquid equilibrium data were determined using a Jones still for the systems isopropanol-benzene at 50°, 60", and 70"C, isopropanol-cyclohexane at 50" and 60"C, and isopropanol-methylcyclohexane at 50" and 60°C. The Kretschmer and Wiebe equation was used for the isopropanol-cyclohexane and isopropanolmethylcyclohexane systems. Equilibrium data for the isopropanol-benzene mixtures were analyzed by using an extension of the Kretschmer and Wiebe equation suggested by Nagata. Calculated results for the three systems are generally in good agreement with the experimental values. The experimental data for all systems were also correlated with the Wilson, Heil, and NRTL equations.