Implementation of PC-SAFT and SAFT + Cubic for modeling thermodynamic properties of haloalkanes. II. 7 Haloethanes and their mixtures

This study compares PC-SAFT and SAFT + Cubic in predicting various thermodynamic properties of 7 haloethanes. The correct estimation of the pure compound critical points contributes to a superior over-all robustness and reliability of SAFT + Cubic. However SAFT + Cubic is less accurate in modeling vapor pressures and isobaric heat capacities away from the critical points. Nevertheless, while being imprecise in predicting C_P and C _V separately, SAFT + Cubic establishes a more successful mutual error cancellation of these properties, both for ratio and for arithmetic average. Hence, the inaccurate estimations of heat capacities have relatively small impact on predictions of sound velocities. Considering the fact that the heat capacities in engineering equipment are somewhere between constant-volume and constant-pressure conditions, SAFT + Cubic might in fact yield reasonable estimations of the actual data. However its strongest points in comparison to PC-SAFT are the predictions of sound velocities and phase equilibria.