Multilayer membrane and process of manufacturing same

Details Multilayer membrane and process of manufacturing same Multilayer membrane and process of manufacturing same

1991-07-26

1992-11-17

Sever, Frank

Liquid purification or separation

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Material

21050041, 21050043, 264 451, 264DIG48, 264DIG62, B01D 6136, B01D 6700

Patent

active

051640880

ABSTRACT:
The process of making a multilayer membrane composed of a carrier layer, a porous supporting layer and a separating layer includes making a modified polyvinyl alcohol by decomposing a polyvinyl ester or ether until the proportion of the vinyl alcohol monomer units in the modified polyvinyl alcohol corresponds to that in a material consisting of 80 to 95% of the polyvinyl ester or ether and 20 to 5% of a polyvinyl alcohol obtained by completely decomposing the polyvinyl ester or ether; preparing a composite material consisting of the carrier layer and the porous supporting layer, preparing a dilute aqueous solution containing 1 to 10% by weight of the modified polyvinyl alcohol; preferably storing the dilute solution at temperatures from -10.degree. to +10.degree. C., preferably from 0.degree. to 5.degree. C., for 3 to 20 days, after storing, applying the dilute solution to the supporting layer of the composite material to coat the composite material with the modified polyvinyl alcohol; and after the applying, heating the composite material coated with the modified polyvinyl alcohol at a temperature of from 100.degree. to 180.degree. for 1 to 60 minutes.

REFERENCES:
patent: 4608141 (1986-08-01), Chlanda et al.

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