Abstract
The Born-Green-Yvon approach of Fischer and Methfessel is extended to binary mixtures of equally sized molecules. Two model mixtures are considered in contact with a plane, strongly adsorbing 9 3 wall. In both models the strengths of the wall particle interactions are different by a factor of 1.1 for the two fluid components. The interactions between the fluid particles are all the same in the one model mixture but of Lorentz-Berthelot type with ϵ bb/ϵ aa = 1.21 in the second. Both fluids are treated under subcritical as well as under supercritical conditions. For the subcritical case density profiles are shown for bulk fluid densities close to the dew density. There, the concentration in the adsorbed layers as well as in the adjacent film corresponds to vapour/liquid equilibrium besides in the first layer at the wall. Adsorption isotherms and selectivity curves are presented for both at sub- and supercritical temperatures.
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