SEARCH Articles Figures Tables V - 30 gives a representation of the process conditions necessary for describing transport through nonporous membranes, where the superscripts m and s refer to membrane and feed permeate side, respectively. If it is assum that thermodynamic equilibrium exists at the membrane interfaces, i.e. that the chemical potential of a given component at the feed membrane interface is equal in both the feed and the membrane, and furthermore, that the pressure inside the membrane is equal to the pressure [Publishers Imprint]