AbstractA new model for adsorption equilibria on heterogeneous surfaces is developed. First an analytical equation for single‐component adsorption is derived. Then the model is extended to mixtures. The comparison with experimental data shows that single‐component data can be described and extrapolated in a wide pressure and temperature range. The mixture data of a strongly real adsorpt system can be predicted with good accuracy only from single‐component sorptive data and the vapor‐liquid equilibrium of the considered system. A simplified model with mixture parameters gives good extrapolation to other tempe