CAPABILITY OF A GROUP CONTRIBUTION EQUATION OF STATE FOR DESCRIBING PHASE EQUILIBRIA IN HYDROCARBON SYSTEMS

Abstract

Phase equilibrium calculations are performed for alkane-aromatics-naphtene (+CO₂) systems to test the ability of the earlier proposed Boublík-van der Waals group contribution equation of state. An important feature of the model is that it does not contain binary (or higher order) mixture parameters. It was found that the model fitted to pure component vapour pressure data performs poorly for mixtures, but if mixture data are also used to estimate model parameters the prediction is acceptable.