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US 5,395,497 AGranted
Process for the manufacture of an aqueous solution of sodium hydroxide
AssigneeSolvay (Societe Anonyme)
InventorLouis Bourgeois
Life of this patent
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Abstract
Process for the manufacture of an aqueous solution of sodium hydroxide by electrodialysis of an aqueous solution (15) of a sodium salt derived from an acid of pK lower than the pK of carbonic acid, the solution being obtained by circulating an aqueous solution of the said acid (14) and an aqueous solution of sodium carbonate (13) on either side of a cationic membrane (12).
Claims11
Process for the manufacture of an aqueous solution of sodium hydroxide, comprising:
- circulating an aqueous solution of sodium carbonate and an aqueous solution of an acid of pK lower than the pK of carbonic acid, respectively on either side of a cationic membrane, to produce by dialysis through the cationic membrane an aqueous solution of a sodium salt derived from said acid;
- and
- electrodialysing said aqueous solution of sodium salt in an electrodialysis cell containing bipolar membranes.
Dependencies are inferred from the claim text.