An experimental technique is described which involves the application of SCF chromatography to predicting enhancement factors in supercritical fluids at elevated pressures. We consider an important step in the development of this application: the determination of solute fugacities in the stationary phase of the chromatograph column. Experimental results are presented for chromatographic retention times of several aromatic hydrocarbons in a column with supercritical CO2 as the carrier fluid and a stationary phase of octadecylsilica particles. The measurements are used to determine the mechanism of solute retention in the column, and to develop a thermodyanmic correlation for predicting solute fugacities in the stationary phase.
ASJC Scopus subject areas
- Chemical Engineering(all)
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry