Determination of the permeant concentration profile in a membrane during gas permeation

Permeation and pervaporation of water through perfluorinated ionomer membranes have been studied. The water concentration profiles through the 190 μm thick membrane have been obtained for different upstream conditions by using the changes in the small-angle neutron scattering curves obtained with th...

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Bibliographic Details
Published in:Journal of membrane science 1989, Vol.46 (1), p.57-65
Main Authors: Thomas, M., Escoubes, M., Esnault, P., Pineri, M.
Format: Article
Language:English
Subjects:
Chemistry
Colloidal gels. Colloidal sols
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
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Summary:Permeation and pervaporation of water through perfluorinated ionomer membranes have been studied. The water concentration profiles through the 190 μm thick membrane have been obtained for different upstream conditions by using the changes in the small-angle neutron scattering curves obtained with the membrane during steady state conditions. Scattering curves corresponding to different water concentrations in the membrane were used as reference curves. A fit procedure permitted the experimental scattering curves obtained during permeation conditions to be matched with a calculated curve obtained by decomposing the membrane in different layers having a defined water content, and therefore corresponding to a reference scattering curve. The profiles obtained in situ explain the discrepancies observed in the transport properties during permeation and pervaporation.
ISSN:0376-7388
1873-3123
DOI:10.1016/S0376-7388(00)81170-9