Abstract
In this study, the Onset of Asphal- tene Precipitation is predicted by a modified Virial equation of state. The bases of quantum me- chanics and statistical thermodynamics are used to evaluate the potential energy and intermolec- ular forces related to asphaltene molecules. The Virial equation of state is modified using group- contribution-methods for asphaltenes, which are assumed to be polymeric-like compounds con- sisting of aggregates of monodisperse asphaltene monomers. It is shown how the modified Virial equation of state with the Peneloux correction leads to estimate the molar volume and solubility parameter. These parameters are also compared successfully with results provided by the Soave- Redlich-Kwong equation of state. The proposed model clearly shows that the asphaltene density and solubility parameters depend on molecular weight and temperature. Some useful correlations among these parameters are introduced. Keyword: Potential energy; Equation of state; Asphaltene Precipitation
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