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Parametrization of molecular-based equations of state : The PC-SAFT, soft-SAFT, PHSC and PSCT models

We examine the parametrization of four molecular-based equations of state (MBEOS): PC-SAFT, soft-SAFT, PHSC and PSCT. In each case, scaled critical and saturation properties are calculated and related to critical temperature T c , critical pressure P c and acentric factor ω through equivalent polynomial expressions. A parametrization strategy matching experimental data of T c , P c and ω gives good fits of saturation pressures, but deviations in saturated liquid densities reflect the limitations of each MBEOS in representing the critical region. Nevertheless, the method presented provides a simple way to determine the MBEOS parameters for a wide variety of fluids and can be extended to other models.