Method for producing an acid and/or alkali metal hydroxide
AssigneeAsahi Glass Company, Limited
InventorsKazuo Umemura, Tsutomu Naganuma, Haruhisa Miyake
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Abstract
A method for producing an acid and/or an alkali metal hydroxide, from a neutral salt by electrodialysis employing a bipolar membrane and an anion exchange membrane and/or a cation exchange membrane, wherein as the anion exchange membrane, an anion exchange membrane made of a polymer having repeating units of the formula: ##STR1## wherein each of R.sub.1, R.sub.2 and R.sub.3 is a hydrogen atom or an alkyl group having up to two carbon atoms, and having an ion-exchange capacity of from 1 to 5 meq/g dry resin, is used.
Claims11
A method for producing an acid, or an acid and an alkali metal hydroxide, from a neutral salt by electrodialysis employing a bipolar membrane, an anion exchange membrane and a cation exchange membrane, wherein the anion exchange membrane comprises a polymer having repeating units of the formula:
- ##STR3## wherein each of R.sub.1, R.sub.2 and R.sub.3 is a hydrogen atom or an alkyl group having up to two carbon atoms, and having an ion-exchange capacity of from 1 to 5 meq/g dry resin,
- wherein the cation exchange membrane comprises a cation exchange membrane having a water content of from 3.0 to 8.0% by weight in an aqueous alkali metal hydroxide solution having a concentration equal to the concentration of the alkali metal hydroxide to be produced.
Dependencies are inferred from the claim text.