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Abstract A new correlation that improves predictions of gas mixtrue adsorption equilibria from single‐component adsorption isotherm data is eveloped, based on the vacancy solution theory. In this theory, the adsorbed phase and the gas phase are treated as two cavancy solutions. The vacancy is an imaginary solvent occupying spaces that will be filled by adsorbates. The composition relationship between the two phases is derived from thermodynamic equilibrium criteria. The non‐ideality of the absorbed solution is accounted for by an acitivity coefficient, whose composition dependence is described by the Wilson equation. For an adsorption system, the binary parameters, adsorbate and vacancy, can be obtained from regression of the pure gas adsorptio data with the cavancy solution isotherm equation. These parameters are then used to predict multicomponent adsorption equilibirum, assuming hat the adsorbate‐adsorbate interactions are negligible. The new correlation has been tested on two different kinds of binary adsorption systems. The new method is more geneeral, simpler to apply, and more accurate than other available models. The predictions can be further improved by taking into account the assorbate‐adsorbate interactions.
Suwanayuen et al. (Tue,) studied this question.