Method and composition for removing sulfur dioxide from flue...

Details Method and composition for removing sulfur dioxide from flue... Method and composition for removing sulfur dioxide from flue...

B - Operations, Transporting

01

D

23/349, 252/35

B01D 53/34 (2006.01) B01D 53/50 (2006.01) C01B 17/775 (2006.01) C01G 49/14 (2006.01)

Patent

CA 1077915

Abstract of Disclosure In a "first" scrubbing operation, the sulfur dioxide containing flue gas is scrubbed with an aqueous solution containing ferric sulfate and aluminum sulfate. The ferric sulfate oxidizes the sulfur dioxide to sulfuric acid, which dissolves in the solution, and is reduced to ferrous sulfate. In a subsequent "second" scrubbing operation, the solution, now containing ferrous sulfate, aluminum sulfate, and sulfuric acid, is scrubbed with air. This regenerates, or re-oxidizes the ferrous sulfate to ferric sulfate. The presence of aluminum sulfate accelerates the rate of regeneration. The regenerated solution is then returned to its function in a "first" scrubbing operation, and the indicated cycle of "first" and "second" scrubbing operations are repeated.

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