Experimental isotherms and prediction results for adsorption of benzene, toluene, dichloromethane and 1,1-dichloro-1-fluoroethane on hydrophobic Y-type zeolite are reported. Isotherm shows the type-V shape according to the classification by Brunauer et al. A simple thermodynamic method is employed to predict the experimental equilibrium data at various temperatures simultaneously. This plain method is based on the assumption that the value of the isosteric heat of adsorption does not depend on temperature for a certain surface loading. The Clausius–Clapeyron equation was used to calculate the isosteric heat of adsorption. To apply the method, only two sets of the experimental isotherm data at two different temperatures are needed. The Clausius–Clapeyron equation with two isotherms provided simple and reliable prediction of adsorption equilibrium relationships at various temperatures. Our results with this method showed that the predicted value agrees well with the experimental data in the range of temperatures for the system tested.