Process for the manufacture of sodium carbonate
AssigneeSolvay (Societe Anonyme)
InventorPaul Demilie
Life of this patent
Estimating the term…
Abstract
Process for the manufacture of sodium carbonate crystals comprising: the addition of solid sodium carbonate (1) to an aqueous solution comprising sodium bicarbonate and sodium carbonate; the crystallization and the separation of sodium sesquicarbonate crystals; (B, C) the crystallization of sodium carbonate crystals, (E) the amount of sodium carbonate added being adjusted so that the crystallization of sesquicarbonate crystals can be carried out without preliminary evaporation of the aqueous suspension.
Claims20
A process for the manufacture of sodium carbonate monohydrate crystals comprising:
- a) the addition of sodium carbonate to an aqueous solution comprising sodium bicarbonate and sodium carbonate in an amount sufficient to exceed the solubility of sodium sesquicarbonate and to form an aqueous suspension comprising crystals of sodium sesquicarbonate;
- b) the separation of sodium sesquicarbonate crystals from the aqueous suspension, in order to obtain sesquicarbonate crystals, on the one hand, and an aqueous mother liquor, on the other hand;
- and
- c) the crystallization and the separation of sodium carbonate monohydrate crystals from the aqueous mother liquor.
A process for the manufacture of sodium carbonate monohydrate crystals comprising:
- a) the addition of sodium carbonate to an aqueous solution comprising sodium bicarbonate and sodium carbonate, in order to form an aciueous suspension;
- b) the crystallization and the separation of sodium sesquicarbonate crystals from the aqueous suspension, in order to obtain sesciuicarbonate crystals, on the one hand, and an aqueous mother liquor, on the other hand;
- c) the crystallization and the separation of sodium carbonate monohydrate crystals from the aqueous mother liquor,
- wherein the amount of sodium carbonate added in a) is adjusted so that sodium sesquicarbonate solubility is exceeded, and so that the crystallization of sesquicarbonate crystals in b) can be carried out without preliminary evaporation of the aqueous suspension, and
- wherein the crystallization of sesquicarbonate crystals in b) is carried out without preliminary evaporation of the aqueous suspension.
Dependencies are inferred from the claim text.