The non-ideality of the system benzene+1,2-dichloroethane adsorbed in microporous carbons at 293 K

In the case of simple vapour mixtures adsorbed by active carbons, the activ ity coefficients seem to depend essentially on the composition of the adsor bed phase, rather than on the degree of micropore filling. Consequently, th e liquid-solid adsorption equilibrium of benzene + 1,2-dichloroethane mixtu res has been investigated at 293 K, using a typical active carbon and follo wing earlier work for adsorption from the vapour phase. This system has the advantage that the mixture is ideal in the liquid state, which provides a convenient reference for the study of the adsorbed phase. The activity coef ficients, as well as the excess enthalpy of immersion of the carbon into th e liquid mixtures, provide information on the modifications in the adsorbed state with respect to the ideal mixture. It is also shown that the introdu ction of the activity coefficients derived from the solid-liquid equilibriu m increases considerably the accuracy of the Myers-Prausnitz-Dubinin model for the adsorption of the vapour mixtures.