REPRESENTATION AND PREDICTION OF THERMOPHYSICAL PROPERTIES OF HEAVY HYDROCARBONS

Thermophysical properties (vapor pressures, saturated liquid densities , heats of vaporization and saturated liquid heat capacities) of a wid e variety of hydrocarbons present in petroleum fluids are calculated w ith a Peng-Robinson type equation of state. The form of the temperatur e dependent parameter found by Carrier et al. (1988) is slightly modif ied. Each component is characterized by three parameters: the normal b oiling absolute temperature, the pseudocovolume and the shape paramete r, both calculated by a Bondi-like group contribution method. A consis tent correction which improves volumetric estimations is also develope d using a group contribution model. The proposed approach yields good representation of pure component saturated properties.