Modeling of pure components high pressures densities using CK-SAFT and PC-SAFT equations

Abstract

SAFT equations of state have been widely used for the determination of different thermo-physical and phase equilibria properties. In order to use these equations as predictive models it is necessary to calculate the model parameters. In this work CK-SAFT and PC-SAFT equations of state were applied for the correlation of pure compounds densities in the wide ranges of temperature and pressure (288.15–413.15 K and 0.1–60 MPa, respectively). The calculations of densities for n-hexane, n-heptane, n-octane, toluene, dichloromethane and ethanol, under high pressure conditions, were performed with the new sets of parameters determined in this paper by CK-SAFT and PC-SAFT. Very good agreement between experimental and calculated density values was achieved, having absolute average percentage deviations lower than 0.5 %. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. OI 172063]

Keywords

• density
• modeling
• non-associative compounds
• CK-SAFT
• PC-SAFT