Vapor Equilibrium in Associating Systems (Water-Formic Acid-Propionic Acid)

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35 Scopus citations


Experiments were conducted for determination of the vapor-liquid equilibria in the ternary system water-formic acid-propionic acid at atmospheric pressure. A thermodynamic model which accounts for nonideal gas behavior and association effects is used for computing the liquid overall activity coefficients. These were correlated using the Redlich-Kister equation and the effect of the ternary constant was found insignificant. The boiling points revealed a ternary saddle-point azeotrope which boils at 107.50 °C and contains 42 mol % water, 54 mol % formic acid, and 4 mol % propionic acid.

Original languageEnglish
Pages (from-to)274-280
Number of pages7
JournalIndustrial and Engineering Chemistry Fundamentals
Issue number4
StatePublished - 1 Jan 1976

ASJC Scopus subject areas

  • General Engineering


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