Measurement and prediction of high-pressure vapor-liquid equilibria for binary mixtures of carbon dioxide + n-octane, methanol, ethanol, and perfluorohexane

Katsumi Tochigi*, Tooru Namae, Tooru Suga, Hiroyuki Matsuda, Kiyofumi Kurihara, M. Carolina dos Ramos, Clare McCabe

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)

Abstract

We report the measurement of high-pressure vapor-liquid equilibrium data for binary mixtures of carbon dioxide + n-octane, +methanol, and +ethanol systems at 313.14 K and carbon dioxide + perfluorohexane at 303.15-323.15 K. The experimental data were collected using a new simple apparatus for measuring high-pressure vapor-liquid equilibria and correlated using a modified SRK equation with the three-parameter conventional mixing rule proposed by Adachi and Sugie. The SAFT-VR equation of state has also been used to predict the phase behavior and found to be in good agreement with experimental data. For the carbon dioxide + methanol, carbon dioxide + ethanol and carbon dioxide + perfluorhexane systems simple Lorentz-Berthelot combining rules can be used to determine the cross interactions and predict the phase behavior. For the carbon dioxide + n-octane system cross interaction parameters fitted to experimental data are needed in order to capture the non-ideal phase behavior exhibited by this system.

Original languageEnglish
Pages (from-to)682-689
Number of pages8
JournalJournal of Supercritical Fluids
Volume55
Issue number2
DOIs
Publication statusPublished - Dec 2010

Keywords

  • Adachi-Sugie mixing rule
  • Carbon dioxide
  • Equation of state
  • Experimental data
  • Modified SRK equation
  • SAFT-VR
  • Vapor-liquid equilibria

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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