Predicting the phase equilibria of petroleum fluids with the SAFT-VR approach

Lixin Sun, Honggang Zhao, Clare McCabe*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


The SAFT-VR equation of state is combined with a semi-continuous thermodynamic approach to model several synthetic and crude oil systems. In our approach, the oil fractions are defined by a continuous distribution that is then represented as discrete pseudo-components using the Gaussian quadrature method. The SAFT-VR parameters for the pseudo-components are obtained from simple linear relationships that were defined in earlier work, which allows the approach to be easily applied to undefined oil systems. Good agreement between the theoretical predictions and experimental data is obtained for bubble point pressure calculations of several gas condensates and the solubility of eases such as methane, ethane, and carbon dioxide in several crude oils.

Original languageEnglish
Pages (from-to)720-731
Number of pages12
JournalAIChE Journal
Issue number3
Publication statusPublished - Mar 2007


  • Crude oil
  • Equation of state
  • Gas condensate
  • Mixtures
  • Multicomponent
  • Phase equilibria
  • Pseudo-component
  • Solubility

ASJC Scopus subject areas

  • Biotechnology
  • Environmental Engineering
  • General Chemical Engineering


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