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Gas permeability of wet cation exchange membranes

Gas Separation & Purification, ISSN: 0950-4214, Vol: 4, Issue: 4, Page: 182-184
1990
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The permeation of CO 2 across a Nafion cation exchange membrane in different hydrated forms is studied. The water solvent linked to the ion exchanging sites of the charged membranes forms a liquid supported membrane in which the transport of the polar gas is enhanced. This effect is still higher when the dry membrane is swollen in a Li 2 CO 3 solution which increases the carbonate/bicarbonate anion concentration in the wet membranes and reduced the effectiveness of the Donnan co-ion exclusion from the membrane phase.

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