A saturated liquid density equation in conjunction with the Predictive- Soave-Redlich-Kwong equation of state for pure refrigerants and LNG multicomponent systems

Khashayar Nasrifar, Mahmood Moshfeghian*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


An equation and a set of mixing rules for the prediction of liquid density of pure refrigerants and liquified natural gas (LNG) multicomponent systems have been developed. This equation uses the parameters of Mathias and Copeman [P.M. Mathias, T.W. Copeman, Fluid Phase Equilib. 13 (1983) 91-108] temperature dependent-term for the Predictive-Soave-Redlich-Kwong [T. Holderbaum, J. Gmehling, Fluid Phase Equilib. 70 (1991) 251-265] equation of state and hence it could be used together with this equation. The equation uses a characteristic parameter for each refrigerant; however, if it is not available, a value of zero is recommended. This model gives an average of absolute errors less than 0.42% for the prediction of liquid density of 28 pure refrigerants consisting of 2489 data points and 0.33% for 18 multicomponent LNG systems involving 132 data points. The model parameters were determined from pure component properties and reported. These parameters were then used without any adjustment to predict liquid density of multicomponent LNG mixtures and excellent results were obtained. The model was also compared with other available methods.

Original languageEnglish
Pages (from-to)231-242
Number of pages12
JournalFluid Phase Equilibria
Issue number2
Publication statusPublished - Dec 1998


  • Equation of state
  • Liquid density equation
  • LNG
  • Refrigerant

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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