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1 Polish Journal of Chemistry

1 2006

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Parametrization of Molecular-Based Equations of State: The PC-SAFT, soft-SAFT, PHSC and PSCT Models

Castro-Marcano F., Colina C., Olivera-Fuentes C.

Polish Journal of Chemistry

2006

Vol. 80, nr 1

37-49

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 Tc, critical pressure Pc and acentric factor omega through equivalent polynomial expressions. A parametrization strategy matching experimental data of Tc, Pc and omega 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.