A method for the combined production of a sulfur oxide...

C - Chemistry – Metallurgy – 05 – G

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C05G 1/00 (2006.01) C05C 13/00 (2006.01) C05G 1/06 (2006.01)

Patent

CA 2631213

The invention provides a method for the combined production of (I) a sulfur oxide containing product and (II) a fertilizer selected from a group consisting of ammonium nitrate, ammonium phosphates and a combination thereof, through an indirect neutralization of ammonia with an acid selected from the group consisting of nitric acid, phosphoric acid and a combination thereof, the method comprising: a. contacting a precipitate containing calcium sulfite with a solution of nitric acid and a solution of ammonia in two separate steps, to form the fertilizer, the sulfur oxide containing product and a precipitate containing calcium hydroxide; and b. separating at least portion of the fertilizer, the sulfur oxide and the calcium hydroxide into three separated streams.

L'invention concerne un procédé destiné à la production combinée: (I) d'un produit renfermant de l'oxyde de soufre et (II) d'un engrais sélectionné dans un groupe comprenant du nitrate d'ammonium, des phosphates d'ammonium et une combinaison de ceux-ci, par neutralisation indirecte d'ammoniac avec un acide sélectionné dans le groupe comprenant de l'acide nitrique, de l'acide phosphorique et une combinaison de ceux-ci, le procédé consistant: a. à mettre en contact un précipité renfermant du sulfite de calcium avec une solution d'acide nitrique et une solution d'ammoniac dans deux étapes distinctes, afin de former l'engrais, le produit renfermant l'oxyde de soufre et un précipité renfermant de l'hydroxyde de calcium; et b. à séparer au moins une partie de l'engrais, de l'oxyde de soufre et de l'hydroxyde de calcium en trois flux distincts.

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