Production of bipolar membranes
First Claim
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1. In a process for the production of a bipolar membrane by bonding an anion exchange membrane to a cation exchange membrane with the aid of an ion-permeable adhesive in a layer adjoining the two membranes, the improvement which comprises:
- forming the adhesive bonding layer by applying to at least one membrane surface a 0.5-70% strength by weight aqeuous soltuion of a polyvinylamine having a molecular weight of from 104 to 106 ; and
subjecting the resulting prepared bipolar membrane to an electrodialysis treatment sufficient to strengthen thea dhesive bonding of the two membranes.
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Abstract
A bipolar membrane is produced by fastening an anion exchange membrane to a cation exchange membrane with the aid of an ion-permeable adhesive, by a process in which an aqueous solution of a polyvinylamine is used as the adhesive, and the bipolar membrane, which consists of two ion exchange membranes and the film-like adhesive, is subjected to electrodialysis.
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Citations
9 Claims
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1. In a process for the production of a bipolar membrane by bonding an anion exchange membrane to a cation exchange membrane with the aid of an ion-permeable adhesive in a layer adjoining the two membranes, the improvement which comprises:
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forming the adhesive bonding layer by applying to at least one membrane surface a 0.5-70% strength by weight aqeuous soltuion of a polyvinylamine having a molecular weight of from 104 to 106 ; and subjecting the resulting prepared bipolar membrane to an electrodialysis treatment sufficient to strengthen thea dhesive bonding of the two membranes. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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- 8. A bipolar membrane comprising an anion exchange membrane and a cation exchange membrane joined by an adhesive layer consisting essentially of a polyvinylamine having a molecular weight of from 104 to 106.
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