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Equilibrium data for the sorption of oxygen, nitrogen, carbon monoxide, and methane in 5A molecular sieve are analyzed in terms of a simple theoretical model isotherm. The model provides an excellent correlation of the single-component isotherms over the entire concentration range, and it is shown that equilibrium data for sorption of binary mixtures of these gases are correcdy predicted by the model using the parameters (Henry constants and molecular volumes) derived from analysis of the singlecomponent isotherms. The model predicts that mixtures of two sorbates with euual molecular volumes should show amroximatelv ideal solution behavilr in the adsorbed phase. The experim&h data df Lederman for the sorption of nitrogen-methane mixtures show the expected behavior over a wide range of pressures. SCOPEIndustrial adsorption separation processes generally involve the sorption of multicomponent mixtures, and a reliable predictive method of estimating mixture equilibria from single-component isotherm data is required for the proper design and modeling of such processes. Of the available methods which have so far been suggested, the method of Myers and Prausnitz (1965), which is based on the assumption of ideal behavior in the adsorbed phase,