Abstract
Improvements to the chromatographic apparatus for diffusivity measurements in supercritical carbon dioxide with flame ionization detection have been designed and evaluated. Modifications concerned the injection with partial solvent evaporation in the injector loop, separation of solutes and solvent in a short precolumn coated with a thin film of PS 264 stationary phase, and a back-pressure device. Diffusion coefficients of C 15-C 18 n-alkanes, dodecanone, pentadecanone, methyl myristate and biphenyl in supercritical carbon dioxide at 100°C and 125°C at 100 atm were determined. The method of optimization of D g to a plot of H vs. v was evaluated for the estimation of diffusion coefficients. The estimated diffusion coefficients have been compared with the average diffusion coefficients and diffusion coefficients calculated from the Wilke-Chang equation. Relatively good agreement of measured diffusion coefficients and those calculated from the modified Wilke-Chang equation has been obtained for biphenyl and polar solutes.
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