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Article | REF: J2810 V1

Gas permeation

Authors: Lian-Ming SUN, Jean-Yves THONNELIER

Publication date: September 10, 2004

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2. Gas permeation membranes

2.1 Mechanism and modeling of gas permeation

The transfer of a gas through polymers results from a solution-diffusion mechanism, with the gas first dissolving in the polymer phase before being transported by a diffusion process.

The permeation rate of a gas through a polymer is therefore described by Fick's law:

J k = – D k ∇c k

with :

J k
 : 
permeation flux
...
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