Crystallization of sodium carbonate decahydrate from liquors supersaturated in sodium bicarbonate
AssigneeFMC Wyoming Corporation
InventorWilliam C. Copenhafer
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Abstract
A process for recovering sodium carbonate decahydrate crystals from solutions and mother liquors supersaturated in sodium bicarbonate concentration. Feed liquors containing higher levels of sodium bicarbonate than traditionally fed to a sodium carbonate decahydrate crystallizer are used to create a mother liquor within a sodium carbonate decahydrate crystallizer that is supersaturated with respect to sodium bicarbonate. Substantially pure sodium carbonate decahydrate crystals may be precipitated from the supersaturated mother liquor without substantially precipitation of sodium bicarbonate containing crystals.
Claims20
A method of crystallization of sodium carbonate decahydrate crystals from an aqueous solution containing sodium carbonate and sodium bicarbonate comprising conducting said crystallization under conditions which maintain said solution in a supersaturated condition with respect to dissolved sodium bicarbonate.
In a method of producing sodium carbonate decahydrate crystals from an aqueous solution of sodium carbonate and sodium bicarbonate in a cooling-type decahydrate crystallizer, the improvement comprising maintaining the solution in a supersaturated condition with respect to sodium bicarbonate.
In a method of producing sodium carbonate decahydrate crystals from an aqueous solution of sodium carbonate and sodium bicarbonate in an evaporative-type decahydrate crystallizer, the improvement comprising maintaining the solution in a supersaturated condition with respect to dissolved sodium bicarbonate.
Dependencies are inferred from the claim text.