Sorption of Ethylene, Propylene and Cyclopropane in 5A Zeolite: Analysis of Equilibrium Isotherms

Abstract

Experimental equilibrium isotherms are presented for the sorption of light unsaturated hydrocarbons in type A zeolite. The data are analyzed according to the extended potential theory of Dubinin and also by the use of a simple statistical model isotherm. Henry constants and heats and entropies of sorption are calculated and compared with the values previously obtained for the light paraffins. It is shown that the relatively stronger adsorption of the olefins, in comparison with the corresponding paraffins, is almost entirely attributable to the greater energy of sorption arising from specific electrostatic interactions. Under comparable conditions the entropies of sorption of paraffins and olefins arc very similar.