High-Pressure Phase Equilibria in Ternary Systems of Propionic Acid and Water with Ethane, SF6, or Refrigerant 13 (CCIF3), 23 (CF3H), or 116 (C2F6)

Richard C. Willson, Athanassios Z. Panaglotopoulos, Robert C. Reid

Research output: Contribution to journalArticle

2 Scopus citations


Vapor-liquid and liquid-liquid equilibrium compositions are presented for the ternary systems of H2O and propionic acid with refrigerant 23 (R23; CF3H), ethane, R13 (CCIF3), SF6, and R116 (C2F6) at 313 K, near the critical temperature of each solvent. Equilibria for most systems were determined at 15.0 MPa; the subcritical solvent SF6 was studied at a pressure just above its vapor pressure at 313 K (4.0 MPa). The distribution coefficient of propionic acid between the solvent phase and the aqueous phase increases with the water solubility of the solvent. Only the fully fluorinated solvents SF6 and R116 (C2F6) are immiscible with proplonic acid under the conditions of interest. Where solvent + water binary data are available, the experimental data for the ternary systems were correlated by using a cubic equation of state and a density-dependent mixing rule with model parameters derived from binary data only.

Original languageEnglish (US)
Pages (from-to)290-293
Number of pages4
JournalJournal of Chemical and Engineering Data
Issue number3
StatePublished - Jul 1 1991

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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