Method for production of sodium bicarbonate, sodium...

C - Chemistry – Metallurgy – 01 – D

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C01D 7/18 (2006.01) C01C 1/244 (2006.01) C01D 7/02 (2006.01) C01F 11/46 (2006.01)

Patent

CA 2205199

The invention provides several processes for generating sodium carbonate compounds and ammonium sulfate in which the compounds are in a commercially viable and substantially pure form. In one embodiment, the process involves salting out sodium compounds in order to arrive at a high purity ammonium sulfate fertilizer. Several different processes are disclosed which include sodium ion reduction by ion exchange, refrigeration, ammonia shifting and evaporation. The processes disclosed also relate to adaptation of the processes to flue gas desulfurization and gypsum production. The processes disclosed herein result in the production of ammonium sulfate in a purity previously unobtainable by prior art methods.

L'invention concerne plusieurs procédés pour la production de composés de carbonate de sodium et de sulfate d'ammonium, selon lesquels les composés sont sous une forme commercialement viable et pratiquement pure. Dans l'un des modes de réalisation, le procédé comprend le relargage des composés de sodium pour obtenir un engrais de sulfate d'ammonium de grande pureté. L'invention concerne plusieurs procédés différents qui comprennent la réduction des ions sodium par échange d'ions, la réfrigération, le déplacement et l'évaporation de l'ammoniaque. Les procédés décrits ont également trait à une adaptation des procédés pour la désulfuration de gaz de combustion et la production de gypse. Ces procédés ont pour résultat la production de sulfate d'ammonium présentant une pureté impossible à obtenir auparavant selon les procédés de la technique antérieure.

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