“…In general, it has been accepted that adsorption plays a much greater role in the separation of aromatics relative to paraffins. As a result, aromatic separation has received much attention (Mortimer and Gent, 1963;Datar et al, 1957;Cowan and Cartwell, 1961;Van Rysselberge and Van der Stricht, 1962;Mortimer and Gent, 1964;Kiselev et al, 1972;Fuchs, 1971;Chitour and Vergnaur, 1974;Carringer et al, 1975). One recent exception to this has been the work of Thielmann (1975), who has studied the gas chromatographic behavior of metal-tris (EDA) cation exchange montmorillonite.…”