Application of predictive equations of state in calculating natural gas phase envelopes and critical points

F. Farshchi Tabrizi, Kh Nasrifar*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


The phase equilibria and critical points of natural gas mixtures are calculated from two predictive equations of state. One of the predictive equations of state is introduced in this work. This model takes the advantages of a pressure-volume-temperature relationship that accurately describes the supercritical fugacity of methane and a group contribution method that suitably estimates the binary interaction parameters per pair of natural gas constituents. As a result, this model accurately predicts the vapor-liquid equilibria of natural gas mixtures. It also satisfactorily predicts the critical points of natural gas mixtures. Comparisons with experimental data and the other predictive method are presented.

Original languageEnglish
Pages (from-to)21-28
Number of pages8
JournalJournal of Natural Gas Science and Engineering
Issue number1
Publication statusPublished - Mar 2010
Externally publishedYes


  • Binary interaction parameter
  • Critical point
  • Equation of state
  • Natural gas
  • VLE

ASJC Scopus subject areas

  • Energy Engineering and Power Technology

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