ADSORPTION OF ORGANIC-SOLVENT VAPORS ON HYDROPHOBIC Y-TYPE ZEOLITE

Experimental isotherms and prediction results for adsorption of benzen e, toluene, dichloromethane and 1,1-dichloro-1-fluoroethane on hydroph obic Y-type zeolite are reported. Isotherm shows the type-V shape acco rding to the classification by Brunauer et al. A simple thermodynamic method is employed to predict the experimental equilibrium data at var ious temperatures simultaneously. This plain method is based on the as sumption that the value of the isosteric heat of adsorption does not d epend on temperature for a certain surface loading. The Clausius-Clape yron equation was used to calculate the isosteric heat of adsorption. To apply the method, only two sets of the experimental isotherm data a t two different temperatures are needed. The Clausius-Clapeyron equati on with two isotherms provided simple and reliable prediction of adsor ption equilibrium relationships at various temperatures. Our results w ith this method showed that the predicted value agrees well with the e xperimental data in the range of temperatures for the system tested.