An extension of cubic equations of state to vapor-liquid-solid equilibria in asphaltene-toluene mixture and crude oil system

This paper introduces an extension of cubic equation of state (Peng-Robinson EOS) to describe asphaltene-toluene mixture vapor-liquid equilibria (VLE) and characterize the pure asphaltene and the critical properties of asphaltene are adjusted (table (4)). To extend the model to mixtures, a mixing rule P-R EOS is used. Our experimental data (table (1)) in this study were used to examine the proposed EOS measured from the Iranian crude oil reservoir. We determined the critical properties of asphaltene for this EOS with using the two phase vapor-liquid equilibrium calculation. In second step, we will prepare the multisolid three phase Flash calculation (VLSE) with P-R EOS, for to determine the amount of asphaltene precipitation in crude oil mixtures system (table (2)) and interaction parameter between asphaltene and crude oil component. The test results showed that the proposed procedure is adequate for predicting the asphaltene precipitation data measured.

کلیدواژه ها:

Asphaltene precipitation ، Equation of state ، Multisolid vapor-liquid-solid equilibria