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US 2009/0260993 A1Published application
Method for obtaining sodium carbonate crystals
AssigneeSolvay (Societe Anonyme)
InventorsFrancis M. Coustry, Michel Hanse
Life of this patent
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Abstract
Method for producing sodium carbonate, according to which an aqueous sodium chloride solution (5) is electrolyzed in a membrane-type cell (1) from which an aqueous sodium hydroxide solution (9) is collected, and carbonated by direct contact with carbon dioxide (15) to form a slurry of crystals of anhydrous sodium carbonate (16).
Claims15
A method for producing sodium carbonate, comprising
- electrolyzing an aqueous sodium chloride solution in a membrane-type cell (1) with an ion permselective membrane in order to produce hydrogen (8), chlorine (7) and an aqueous solution (9) comprising sodium hydroxide, and
- submitting the aqueous solution (9) comprising sodium hydroxide to a carbonation (2) wherein the carbonation (2) is carried out by directly contacting carbon dioxide (15) with the aqueous solution (9) comprising sodium hydroxide in a gas liquid contactor under conditions such as to cause the conversion of the aqueous solution (9) into an aqueous slurry (16) of anhydrous sodium carbonate crystals.
Dependencies are inferred from the claim text.