where N , p, and ρ i are the total number of sites, pressure, and density on site i, respectively. The calculated sorption selectivity is shown in Fig. . In this figure, the ideal results are obtained from pure component calculations and are compared with the results obtained for adsorption from binary mixtures under the same conditions as in the source control volume in the DMFT studies. Large deviations between the ideal and mixture calculations are observed for C 1 . In this case, both fluids strongly interact with the solid structure and the competition for the binding sites cannot be captured by considering separately individual adsorption isotherms for pure components. The differences are lessened when adsorption of one of the components strongly dominates over the other (C 3 ) and the results are almost identical if both components adsorb weakly (C 2 ) due to the reduced adsorption density and lack of competition for the available porous space. Notably, as expected, the selectivity grows with volume fraction of solid lattice sites ϕ s due to the increased solid-fluid interactions.