A rationale for the preparation of asymmetric pervaporation membranes

M.H.V. Mulder, J. Oude Hendrikman, J.G. Wijmans, C.A. Smolders

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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.
Original languageUndefined
Pages (from-to)2805-2820
JournalJournal of applied polymer science
Volume30
Issue number7
DOIs
Publication statusPublished - 1985

Keywords

  • IR-70794

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