Prediction of excess enthalpies using a G(ex)/EOS model

The Peng-Robinson equation of state las modified by Stryjek and Vera), comb ined with the Wong-Sandler mixing rule, was used for the prediction of exce ss enthalpies of highly nonideal mixtures at both low and high pressures, a nd with supercritical components included. In this work, the model paramete rs were fitted only to experimental vapor-liquid equilibrium data and were then used to obtain simultaneous representation of both vapor-liquid equili bria and excess enthalpy data. The results show that this equation of state model is able to yield not only qualitative, but also reasonably quantitat ive, predictions of the thermodynamic properties of nonideal systems of var ying complexity.