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US 5,849,195 AGranted
Composite membrane, process of manufacturing it and process of using it
AssigneeMetallgesellschaft Aktiengesell-Schaft
InventorsPeter Haenel, Erika Schwerdtner, Harald Helmrich
Life of this patent
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Abstract
Disclosed is a composite membrane for removing water from dilute organic or inorganic acids by pervaporation or vapor permeation. The composite membrane in accordance with the invention is of a porous carrier layer, a porous backing layer, and a non-porous separating layer, which consists of a PVC-PCac copolymer having a PVac content of 10 to 25% by weight of the copolymer.
Claims12
A composite membrane comprising:
- a porous carrier layer of a nonwoven or woven fabric;
- a porous backing layer consisting essentially of at least one material selected from the group consisting of polysulfone, polyimide, polyvinyl alcohol, polyurethane, polyvinylidene fluoride, polyether sulfone, polyacrylonitrile, polyether ketone, polyether ether ketone, polyether imide and their copolymers;
- and
- a non-porous separating layer, consisting essentially of a polyvinyl chloride-polyvinyl acetate copolymer in which the polyvinyl acetate amounts to 10 to 25% by weight of the copolymer, the membrane being formed by a process comprising the step of subjecting the carrier layer together with the separating layer to a temperature of 80.degree. to 160.degree. C. for 1 to 60 minutes.
1 more element
Dependencies are inferred from the claim text.