Handling of acids from compressed oxyfuel-derived co2

Details Handling of acids from compressed oxyfuel-derived co2 Handling of acids from compressed oxyfuel-derived co2

C - Chemistry, Metallurgy

01

B

C01B 31/20 (2006.01) B01D 53/60 (2006.01) C01B 17/74 (2006.01) C01B 17/96 (2006.01) C01B 21/38 (2006.01)

Patent

CA 2745160

Sulfur dioxide (SO2) is removed from a carbon dioxide feed gas by maintaining the feed gas at elevated pressure(s) in the presence of oxygen (O2), water and NO x for a period of time sufficient to convert SO2 to sulfuric acid and NO x to nitric acid and produce SO2-depleted, NO x-lean carbon dioxide gas. The invention resides in separating the sulfuric and nitric acids from said SO2-depleted, NO x-lean carbon dioxide gas, and then neutralizing the acids by reaction with an alkaline sorbent in an acid/sorbent reactor system to produce sorbent-derive sulfate. The method has particular application in the removal of SO2 and NO x from flue gas produced by oxyfuel combustion of a carbonaceous fuel.

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