Electrodialysis membranes comprising sulfonated constituents

Details Electrodialysis membranes comprising sulfonated constituents Electrodialysis membranes comprising sulfonated constituents

C - Chemistry, Metallurgy

25

B

18/14, 204/170

C25B 13/08 (2006.01) B01D 61/44 (2006.01) C08J 5/22 (2006.01)

Patent

CA 1309219

ELECTRODIALYSIS MEMBRANES COMPRISING SULFONATED CONSTITUENTS ABSTRACT Permselective membranes are disclosed which comprise a layer comprising polystyrene, at least a portion of which is sulfonated, and between about 10 wt.% and about 35 wt.% monovinyl arene-hydrogentated diene block copolymer, at least a portion of which is sulfonated. The membranes exhibit a resistance of less than about 8 .OMEGA.-cm2 in 7 wt.% Na2SO4 and an ion exchange capacity of between about 1.0 meq/g and about 1.6 meq/g. Monopolar and bipolar membranes comprising the layer are disclosed. A preferred process for forming the membranes comprises the steps of sulfonating polystyrene and monovinyl arene-hydrogenated diene block copolymer, forming a mixture of the materials in a solvent, forming a layer of the mixture and drying the layer to form at least a portion of the membrane.

538497

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