Illustrative examples of permeation and separation with microporous membranes

3 A Illustrative Examples of Permeation and Separation with Microporous Membranes 

Usually membranes investigated in literature do not have the simple architecture assumed in the preceding theoretical treatment. This requires a number of corrections or modified equations before data of the separating layers can be compared and analysed. This problem is treated in Section 9.5 but results will be used in this section. 

Shelekhin et al. [92, 56] reported some interesting results for Vycor type of hollow-fibre membranes (for membrane characteristics see Section 9.4.2.2). The theory of permeation of hollow fibre systems will be treated in Section 9.5. 

For He, H2, O2 and N2 a linear dependence of the transmembrane flux on the pressure gradient across the membrane was observed. So the permeation is constant and independent of pressure as expected for Knudsen diffusion and sorbed gases in the Henry regime (and accordingly to the sum of both mechanisms). 

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

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