Thermodynamics of three toluene-containing mixtures. Generalized van der Waals and Ising-like models

Abstract

Isothermal vapour–liquid equilibrium of toluene–n-heptane, toluene–cyclohexane, and toluene–o-xylene at 348.15 K have been obtained by a dynamic method. The thermodynamic consistency of the p-T-x-y data has been tested using a Padé approximant to describe the composition dependence of the excess Gibbs energy. The results have been used to check the fitting and prediction abilities of several generalized van der Waals models, as well as an Ising-like model. None of the studied models are able to predict correctly G^E, H^E and V^E at 298.15 K.