Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1309, Issue -, Pages 41-47Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2013.08.028
Keywords
Supercritical fluid chromatography; Excess isotherms; Finite layer thickness; Effect of the temperature; Effect of the back pressure
Funding
- National Science Foundation [CHE-1108681]
- Waters Technologies Corporation
- University of Tennessee
- Oak Ridge National Laboratory
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1108681] Funding Source: National Science Foundation
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The excess adsorption isotherm of ethanol from liquid carbon dioxide on a silicagel column was determined in a range of back pressures and temperatures. The retention patterns of minor disturbance peaks were mapped and their dependences on the applied back pressure and column temperature measured. The analysis of the linear decreasing part of the excess isotherm around its inflection point provided the finite layer thickness of the adsorbed phase. Our results show that increasing the temperature and decreasing the back pressure result in a thicker layer of the layer of enriched organic solvent above the silicagel surface. (C) 2013 Elsevier B.V. All rights reserved.
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