DYNAMIC GAS SOLID CHROMATOGRAPHIC TECHNIQUES FOR CHARACTERIZING CARBON MOLECULAR-SIEVES

Gas-solid chromatography (GSC) was used for the evaluation of carbon molecular sieves and provided an insight into their kinetic and thermodynamic properties in both column chromatography and sample enrichment studies. GSC studies of the column chromatographic performance characteristics of these sieves allowed the derivation, from Van Deemter plots, of permeability, capacity ratio, HETP and C-term values. Both conventional (4 and 2 mm I.D.) and micropacked (0.75 mm I.D.) GSC columns were evaluated. GSC studies of the sample enrichment performance characteristics of these sieves allowed the derivation of adsorbate breakthrough volumes, adsorption isotherms and equations of state. Using probe molecules such as dichloromethane, various adsorbent surface areas were extracted from the isotherm plots. Both conventional and micro-packed GSC columns were evaluated.