Application of excess formalism to multicomponent liquid adsorption equilibria

Thermodynamic equations for the description of multicomponent liquid adsorption equilibria on solids are often formulated in terms of absolute quantities instead of excess quantities. Considering the excess nature of liquid adsorption phenomena, the utilization of excess quantities seems to be more suitable for the analysis and prediction of multicomponent liquid adsorption. In this paper, a brief summary of four different possible applications of adsorption excess formalism is given. Calculations and experimental data are used to illustrate theoretical relations and to demonstrate their applicability.