| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 7614300 | Journal of Chromatography A | 2013 | 7 Pages |
Abstract
The adsorption of methanol, ethanol and isopropyl alcohol on a silicagel adsorbent from supercritical carbon dioxide was investigated using nonlinear chromatographic techniques. Series of adsorption isotherm data points of these alcohols were determined by frontal analysis. Their nonlinear adsorption behavior were modeled using a modified BET equation extended for heterogeneous adsorption surfaces. Our results suggest the formation of an adsorbed multilayer of alcohols above the silica surface. This organic solvent enriched layer governs the separation of the analytes in supercritical fluid chromatographic separations, both under analytical and preparative conditions.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Péter Vajda, Georges Guiochon,