Method for production of sodium bicarbonate, sodium...

C - Chemistry – Metallurgy – 01 – D

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C01D 7/12 (2006.01) C01C 1/244 (2006.01)

Patent

CA 2205493

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 présente plusieurs procédés permettant d'obtenir des carbonates de sodium et du sulfate d'ammonium, procédés dans lesquels les composés se trouvent sous forme pratiquement pure et commercialement viable. Dans une des versions de l'invention, le procédé fait appel au relargage des composés sodiques afin d'obtenir un engrais au sulfate d'ammonium de grande pureté. Plusieurs procédés différents sont présentés, notamment la réduction de l'ion sodique par échange ionique, la réfrigération, le déplacement ammoniacal et l'évaporation. L'invention fait également état de l'adaptation des procédés à la désulfuration des gaz de carneau et à la production de gypse. Les procédés de la présente invention permettent de produire du sulfate d'ammonium d'une pureté qui n'a pu être obtenue par les meilleures méthodes existantes.

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