Process for making microporous membranes having gel-filled pores

Details Process for making microporous membranes having gel-filled pores Process for making microporous membranes having gel-filled pores

1991-12-27

1992-11-03

Sever, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

264DIG48, 264DIG62, E01D 6700

Patent

active

051606275

ABSTRACT:
A process is provided for modifying the properties of a hydrophobic microporous membrane which includes the steps of first providing a hydrophobic microporous membrane, treating it with a surfactant to render the membrane hydrophilic, wetting the membrane with an aqueous solution of a polyol such as polyvinyl alcohol (PVA) and divinyl sulfone (DVS) or a precursor thereof, washing the membrane with water to displace the polyol/DVA from the exterior of the membrane while retaining it in the pores of the membrane, and crosslinking the polyol/DVS into an aqueous gel to yield a hydrophilic microporous membrane having pores filled with an aqueous polyol/DVS gel, the exterior of the membrane being unobstructed by gel. The modified membranes produced according to the process are useful in carrying out chromatographic separations.

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Neplenbroek, A. M. et al, "Stable Supported Liquid Membranes", Proceedings, vol. I, The 1990 International Congress on Membranes and Membrane Processes, (North American Membrane Society), pp. 686-688.

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