Permeation Properties in Laminated Membranes

The response of laminated membranes to permeation was investigated using simple permeation equations. The intrinsic permeability constant of the membrane was shown to be between the maximum or minimum intrinsic permeability constant of all component membranes. Thus the separation factor of the laminated membrane for any type of permeating molecules will be between the values of maximum and minimum separation factors of the component membranes. Permeation through the laminated membrane for a given species will depend on the direction of permeation if the intrinsic permeability constant of any permeating molecule is dependent on the concentration. A simple example for the concentration dependence of permeability constant shows the limits of anisotropic flow ratio.