Published:Journal of Chromatographic Science,
ISSN 0021-9665Volume
39, Number 10, October 2001, pp. 123-132
A New Gas Chromatographic Methodology for the Estimation of
the Composition of Binary Gas Mixtures
Khan Rashid Atta, Dimitrios Gavril, and George Karaiskakis*
Department of Chemistry, University of Patras, 26504 Patras, Greece
The relatively new technique
of reversed-flow gas chromatography (RFGC) is used to determine the diffusion
coefficients of pure
gases into gas mixtures (Dexp). The pure gases are CO and CO2, and the mixtures
consist of H2 and He in various volume percentage compositions. A linear regression
analysis of Dexp of CO and CO2 in various mixtures of H2 and He against the percentage
composition (XH2 or XHe) of the mixtures at different temperatures results in
an empirical equation relating Dexp to the corresponding theoretical values of
the diffusion coefficients of CO and CO2 in the pure gases H2 and He, as they
are calculated from the Fuller–Schettler–Giddings equation. The empirical
equation shows that the diffusion coefficient of an analyte gas in a gas mixture
is the partial sum of its diffusion coefficients in the component gases, therefore
making possible the determination of the mole fractions of the components of
the mixture. The found percentage volume compositions are very close to those
determined independently by routine gas chromatography, indicating that the proposed
RFGC methodology could be successfully applied to the accurate determination
of the volume composition of binary gas mixtures.
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