Process for the production of sodium bicarbonate
AssigneeSolvay (Societe Anonyme)
InventorsJean-Paul Detournay, Francis M. Coustry, Alessandra Pastacaldi
Life of this patent
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Abstract
Process for the joint production of sodium carbonate and sodium bicarbonate out of sesquicarbonate, in which the sesquicarbonate is dissolved in water, in order to form a feed water solution comprising both sodium carbonate and sodium bicarbonate, in which at least part of the feed water solution is introduced into all the compartments of an electrodialyser and in which a sodium bicarbonate enriched solution and a sodium carbonate enriched solution are extracted from the compartments.
Claims12
A process for the joint production of sodium carbonate and sodium bicarbonate out of sesquicarbonate, comprising:
- dissolving the sesquicarbonate in water, in order to form a feed water solution comprising both sodium carbonate and sodium bicarbonate;
- introducing at least a part of the feed water solution into an electrodialyser comprising at least one less basic and one more basic adjacent compartments separated by a cationic ion exchange membrane, permeable to sodium ions, the compartments being placed between a positive electrode and a negative electrode;
- and
- extracting a sodium bicarbonate enriched solution from the less basic compartment;
- and
- extracting a sodium carbonate enriched solution from the more basic compartment.
A process for the separation of at least two salts from the same non metallic anion, the two salts having different pH, comprising:
- dissolving the at least two salts in water to form a feed water solution;
- introducing at least a part of the feed water solution in each compartments of an electrodialyser comprising an alternation of less basic and more basic compartments, separated by an alternation of cationic and bipolar ion exchange membranes, placed between a positive electrode and a negative electrode;
- and
- extracting a solution enriched in the salt with the lowest pH from the less basic compartment and extracting a solution enriched in the salt with the highest pH from the more basic compartment.
Dependencies are inferred from the claim text.