Chromatography with sub- and supercritical eluents: influence of temperature, pressure and flow-rate on the behaviour of lower alkanes

The chromatographic behaviour of n-pentane, n-butane, isobutane and propane was studied in the liquid, gaseous and supercritical gaseous states by running chromatograms of a mixture containing four polynuclear aromatic hydrocarbons. Both the capacity ratios and the resolutions reach maxima at temper...

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Bibliographic Details
Published in:Journal of Chromatography A 1985, Vol.321 (2), p.273-286
Main Authors: Leyendecker, Dietger, Schmitz, Franz P., Leyendecker, Dagmar, Klesper, Ernst
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Chromatographic methods and physical methods associated with chromatography
Exact sciences and technology
Other chromatographic methods
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Summary:The chromatographic behaviour of n-pentane, n-butane, isobutane and propane was studied in the liquid, gaseous and supercritical gaseous states by running chromatograms of a mixture containing four polynuclear aromatic hydrocarbons. Both the capacity ratios and the resolutions reach maxima at temperatures above the boiling or the critical temperature at a given constant pressure. The maxima are the more pronounced the lower the alkane and the higher the molecular weight of the substrate. This temperature-dependent course of resolution at constant pressure is influenced mostly by changes in plate numbers. On increasing the pressure, the capacity ratios and resolution decrease.
ISSN:0021-9673
DOI:10.1016/S0021-9673(01)90445-5