Production of bipolar membranes
AssigneeBASF SE
InventorsHans Mueller, Hermann Puetter
Life of this patent
Estimating the term…
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.
Claims9
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 10.sup.4 to 10.sup.6 ;
- and
- subjecting the resulting prepared bipolar membrane to an electrodialysis treatment sufficient to strengthen thea dhesive bonding of the two membranes.
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 10.sup.4 to 10.sup.6.
Dependencies are inferred from the claim text.