Prediction of thermodynamic properties of petroleum and refinery gases using PC-SAFT+FVT model
Luu Tra My (1), Nguyen Huynh Dong (1), Nguyen Huynh Duong (2); 1. Petrovietnam Manpower Training College (PVMTC); 2. Petrovietnam Gas Joint Stock Corporation (PV GAS); Email:


The PC-SAFT equation of state (EoS) combined with the free-volume theory (FVT) recently proposed (DOI: 10.1016/j.fluid.2019. 112280) is extended in this work to simultaneously predict viscosity and some second-order derivative properties such as sound velocity and isobaric heat capacity of some petroleum and refinery gases. The PC-SAFT pure component parameters are obtained by providing the optimal description of its vapour pressure and saturated liquid density data. New FVT parameters were derived for various petroleum and refinery gases and were validated with the National Institute of Standards and Technology’s data over a wide range of temperature and pressure (up to 2,000 bars). The model is simple to incorporate into the design and simulation package such as Aspen Plus or Prosim, with average absolute deviation obtained on viscosity within the experimental incertitude (<3%), which is appropriate for most industrial applications.

Key words: Viscosities, PC-SAFT, prediction, thermodynamic, petroleum gases.


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