Spiral wound electrodialysis cell
OwnerWilliam S. Karninventor
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Abstract
Two ion selective semipermeable membranes, such as are used in electrodialysis cell assemblies, are joined to one another at their edges so as to form a pouch with ion permeable walls. The membranes are provided with end flow ports into the pouch region. The pouch is wound into a spiral so as to resemble a spiral wound reverse osmosis module. A central hub electrode and a peripheral cylindrical electrode are provided. With suitable electrolyte streams the system operates as an electrodialysis cell assembly.
Claims11
An assembly of two ion permeable membrane composites, each of said composites having an integral margin frame boundary region completely bordering the ion permeable region of said membrane composite, said integral margin frame boundary region having flow port connectors giving fluid access to faces of said membranes, said flow port connectors being joined to and passing thru said boundary region, said boundary region of one membrane composite being joined to the boundary region of a second membrane composite so as to form a closed pouch with openings only via said flow port connectors, said pouch being spiral wound about itself wherein the improvement comprises that said boundary region is a thermoplastic film material, that said boundary region is heat sealed to said flow port connectors, and that said boundary region is heat sealed to said second membrane composite boundary region completely around the periphery of said membrane composites.
An assembly of two ion permeable membrane composites, each of said composites having an integral margin frame boundary region completely bordering the ion permeable region of said membrane composite, and said integral margin frame boundary region having flow port connectors giving fluid access to faces of said membranes, said flow port connectors being joined to and passing thru said boundary region, said boundary region of one membrane composite being joined to the boundary region of a second membrane composite so as to form a closed pouch with openings only via said flow port connectors, said pouch being spiral wound about itself becoming thus a spiral wound assembly, said spiral wound assembly having an electrode in its central core region and having an electrode in its peripherial cylindrical region wherein the improvement comprises that said boundary region is a thermoplastic film material, that said boundary region is heat sealed to said flow port connectors, and that said boundary region is heat sealed to said second membrane composite boundary region completely around the periphery of said membrane composites.
Dependencies are inferred from the claim text.