The model developed in part 1 of this series for correlating single component and rather ideal binary adsorption equilibria demonstrated a remarkable ability for correlating complex binary adsorption equilibria, including adsorption azeotropes and sigmoidal-shaped x-y diagrams, using a single binary fitting parameter. This model was also extended successfully for predicting multicomponent adsorption equilibria on a heterogeneous adsorbent surface with a uniform distribution of Henry＇s law constant using single component adsorption isotherm parameters, along with one binary fitting parameter from each of the binary pairs in the multicomponent mixture. Overall, the results from this new model generally showed a marked improvement in the correlation of binary and prediction of multicomponent adsorption equilibria compared to that obtained with the multicomponent Langmuir model, which used only single component isotherm parameters, and compared to that obtained with two-dimensional fluid and loading ratio correlation models that also utilized binary fitting parameters.