Phenomenological Description of Single Gas Permeation

The theory of transport in microporous solids is complex and involves many aspects and steps. Although many aspects has been treated separately (e.g., sorption, diffusion, simulation studies, mechanisms, etc.) there are no coherent descriptions of permeation and separation in microporous membrcmes covering all the important aspects. In this chapter an attempt is made to introduce such a description. It is useful to give a qualitative picture first (Section 9.4.2.1). 

9 — TRANSPORT AND SEPARATION PROPERTIES OF MEMBRANES WITH GASES AND VAPOURS 

This will show that a quantitative description involving all the complexities in simple microporous membranes is not available (if possible). However a number of boundary cases can be described quantitatively, as in Section 9.42.2, and trends in more complex situations can be predicted in combination with the qualitative pictures based on mechanistic considerations. 

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