Absorption of sulfur oxides from hot gases

Details Absorption of sulfur oxides from hot gases Absorption of sulfur oxides from hot gases

B - Operations, Transporting

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B01D 53/34 (2006.01) B01D 53/50 (2006.01) C01B 17/24 (2006.01)

Patent

CA 1080443

ABSORPTION OF SULFUR OXIDES FROM HOT GASES ABSTRACT OF THE DISCLOSURE A process for removing sulfur oxides from a hot gas by sequential absorption of the sulfur oxides in two zones. In each zone the hot gas is contacted with an aqueous scrubbing medium which may be a solution or slurry containing an absorbent for the sulfur oxides. The absorbent is selected from the group consisting of alkali metal carbonates, bicarbonates and mixtures thereof. The preferred absorbent is sodium carbonate. The aqueous solution is introduced into the first zone in an amount to produce (1) a dry powder reaction product containing alkali metal sulfites, and sulfates, substantially free of unreacted absorbent and (2) a substantially water-unsaturated gaseous reaction product of reduced sulfur oxide content. The gaseous reaction product of reduced sulfur oxide content is transferred into the second zone where it is contacted with a sufficient amount of an aqueous solution of absorbent to provide (1) a gaseous reaction product substantially free of sulfur oxide and (2) an aqueous solution containing alkali metal sulfites, sulfates and unreacted absorbent, which solution is used as at least a part of the aqueous solution fed into the first zone. -1-

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