Rapid and Precise Method for the Measurement of Vapor/Liquid Equilibria by Headspace Gas Chromatography

Abul Hussam, Peter W Carr

Research output: Contribution to journalArticlepeer-review

91 Scopus citations

Abstract

This work describes a device designed to allow the rapid measurement of vapor/liquid equilibria, Including vapor pressure and solute activity coefficients, in an automated fashion based on a conventional gas chromatograph. Various correction factors needed to convert the analytical signal (peak area) to the desired thermodynamic quantities have been developed. In general, activity coefficients at low concentration (mole fraction less than 0.01) are in good agreement with literature values (ca. 2%). Similarly, vapor pressures can be measured with good accuracy. The precision of measurement is often better than 0.5%. The major limitation in the accuracy of the method appears to be the lack of high quality experimental gas phase virial coefficients.

Original languageEnglish (US)
Pages (from-to)793-801
Number of pages9
JournalAnalytical Chemistry
Volume57
Issue number4
DOIs
StatePublished - Mar 1 1985

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