Data driven temperature dependence of EOS parameters

A. Deák, S. Kemény, I. Farkas

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Using three kinds of experimental data (pc, Vc and Tc at the critical state or ps, Vsv and VsL at different temperatures for saturation data) three parameters of the EOS may be directly determined and the temperature dependence of the parameters may be established from thermodynamic conditions of vapour - liquid critical point or vapour - liquid phase equilibria respectively. The principle was demonstrated on the BACK EOS. Examples of argon and n-alkanes were used to demonstrate the idea. It was found, that there are two parameter sets of the BACK equation that satisfy the critical or saturation conditions for certain pure compounds. The BACK equation is able to reproduce experimental Zc values for compounds above Zc = 0.2764 (that is, for argon, methane, ethane), but it is improper for higher alkanes. In case of n-alkanes we found that there is no simple function for T dependence of BACK parameters. Parameter values obtained in the way demonstrated may be useful to give initial values for parameter estimation from experimental (e.g., VLE) data.

Original languageEnglish
Pages (from-to)97-105
Number of pages9
JournalFluid Phase Equilibria
Volume140
Issue number1-2
Publication statusPublished - Dec 1997

Fingerprint

Alkanes
Paraffins
Argon
temperature dependence
Vapors
alkanes
Ethane
Methane
Liquids
Phase equilibria
Parameter estimation
Temperature
argon
Thermodynamics
vapors
saturation
ethane
critical point
liquid phases
methane

Keywords

  • Critical state
  • Equation of state
  • Vapour - liquid equilibria

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Physical and Theoretical Chemistry

Cite this

Data driven temperature dependence of EOS parameters. / Deák, A.; Kemény, S.; Farkas, I.

In: Fluid Phase Equilibria, Vol. 140, No. 1-2, 12.1997, p. 97-105.

Research output: Contribution to journalArticle

Deák, A, Kemény, S & Farkas, I 1997, 'Data driven temperature dependence of EOS parameters', Fluid Phase Equilibria, vol. 140, no. 1-2, pp. 97-105.
Deák, A. ; Kemény, S. ; Farkas, I. / Data driven temperature dependence of EOS parameters. In: Fluid Phase Equilibria. 1997 ; Vol. 140, No. 1-2. pp. 97-105.
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