Integration of catalytic s02 oxidation and oxyfuel sour...

Details Integration of catalytic s02 oxidation and oxyfuel sour... Integration of catalytic s02 oxidation and oxyfuel sour...

C - Chemistry, Metallurgy

01

B

C01B 31/20 (2006.01) B01D 53/86 (2006.01) C01B 17/76 (2006.01)

Patent

CA 2745172

Sulfur dioxide (SO2) may be removed from carbon dioxide feed gas by contacting the carbon dioxide at an elevated temperature and an elevated pressure with a catalyst for oxidizing SO2, in the presence of oxygen (O2) to convert SO2 to sulfur trioxide (SO3); contacting SO3 in the resultant SO3-enriched carbon dioxide gas with water to produce sulfuric acid and SO2-depleted carbon dioxide gas; and separating the sulfuric acid from the SO2-depleted carbon dioxide gas. If present, NO x is also removed from the carbon dioxide feed gas as nitric acid to produce SO2-depleted, NO x-lean carbon dioxide gas. The method has particular application in the removal of SO2 and NO x from flue gas produced by oxyfuel combustion of a hydrocarbon fuel or carbonaceous fuel, within or downstream of the CO2 compression train of a CO2 recovery and purification system.

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