Multiphase behavior in ternary fluid mixtures: a case study of the isopropanol-water-CO2 system at elevated pressures

J. R. Diandreth, M. E. Paulaitis

Research output: Contribution to journalArticlepeer-review


Phase behavior involving three and four fluid phases is predicted for ternary mixtures of isopropanol, water and CO2 at temperatures and pressures near the critical point of CO2. These predictions are based on the Peng-Robinson equation of state and selected experimental measurements of phase compositions for the L1L2G, L1L2L3 and L1L2L3G equilibria for the ternary mixture. The calculated results show that this equation of state can describe several unique features of the phase diagram. These features include tricritical points, secondary critical endpoints, and a four-phase L1L2L3G equilibrium. Although quantitative agreement with measured phase compositions was not obtained, the Peng-Robinson equation did predict all the regions of multiple equilibrium phases that were observed in the experiments including those regions not used to obtain the equation-of-state parameters.

Original languageEnglish (US)
Pages (from-to)1061-1069
Number of pages9
JournalChemical Engineering Science
Issue number5
StatePublished - 1989
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Fingerprint Dive into the research topics of 'Multiphase behavior in ternary fluid mixtures: a case study of the isopropanol-water-CO<sub>2</sub> system at elevated pressures'. Together they form a unique fingerprint.

Cite this