Abstract
Thermophysical properties (vapor pressures, saturated liquid densities, heats of vaporization and saturated liquid heat capacities) of a wide variety of hydrocarbons present in petroleum fluids are calculated with a Peng-Robinson type equation of state. The form of the temperature dependent parameter found by Carrier et al. (1988) is slightly modified. Each component is characterized by three parameters: the normal boiling absolute temperature, the pseudocovolume and the shape parameter, both calculated by a Bondi-like group contribution method. A consistent correction which improves volumetric estimations is also developed using a group contribution model. The proposed approach yields good representation of pure component saturated properties.
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