A rationale for the preparation of asymmetric pervaporation membranes

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Mulder, M.H.V. and Oude Hendrikman, J. and Wijmans, J.G. and Smolders, C.A. (1985) A rationale for the preparation of asymmetric pervaporation membranes. Journal of Applied Polymer Science, 30 (7). pp. 2805-2820. ISSN 0021-8995

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Abstract:Pervaporation is carried out primarily with homogeneous membranes. An improvement in permeation rate can be achieved by using asymmetric or composite membranes. In order to maintain a high selectivity, very dense top layers are needed. The formation of asymmetric pervaporation membranes will be discussed in terms of the model proposed by our group: formation of the top layer by gelation; formation of the porous sublayer by liquid-liquid phase separation followed by gelation of the concentrated polymer phase. To obtain very dense top layers the following factors are important: the ratio of nonsolvent inflow and solvent outflow, polymer concentration, location of the liquid-liquid demixing gap, and location of the gel region. Asymmetric membranes have been prepared by varying these factors, and the obtained membranes have been tested on ethanol/water mixtures.
Item Type:Article
Copyright:© 1985 Wiley InterScience
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/70794
Official URL:http://dx.doi.org/10.1002/app.1985.070300708
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