The localized adsorption on zeolites is assumed and a heterogeneous statistical model for multicomponent adsorption equilibria of the substituted aromatic mixtures on zeolites under saturation conditions is developed. The model can be used to correlate the equilibrium data of binary adsorption systems and predict directly multicomponent adsorption equilibria from binary data. The new model has been tested on the systems of toluene-xylene/KY (150℃) and chlorobenzene-chlorotoluene-toluene/CaX(230℃). The proposed model is in satisfactory agreement with the experimental data from the literature

and is better than the homogeneous models published recently.