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Abstract
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High-molecular-weight hydrocarbons and asphaltenes are important constituents of petroleum and
can cause problems related to crystallization and deposition of asphaltene. This article introduces an
extension of the cubic equation of state (Peng-Robinson EOS) to describe asphaltene–toluene mixture
vapor–liquid equilibria (VLE) and characterize pure asphaltene, and the critical properties of asphaltene
were adjusted. Experimental data were used to examine the proposed procedure in an Iranian crude
oil reservoir.
We determined the critical properties of asphaltene for this EOS using a two-phase vapor–liquid
equilibrium calculation. The test results showed that the proposed procedure is adequate for predicting
asphaltene precipitation data.
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