Process for cleaning flue gas

Details Process for cleaning flue gas Process for cleaning flue gas

B - Operations, Transporting

01

D

23/349

B01D 53/34 (2006.01)

Patent

CA 1125479

ABSTRACT OF THE DISCLOSURE A flue gas containing SOx, NOx and O2 is washed with an aqueous alkaline solution containing an NOx removal catalyst to form the salts selected from a dithionate, a sulfate and an imidobissulfate. The salts are crystallized, separated and heated for pyrolysis by a pneumatic conveying pyrolysis unit whereby a gas containing higher concentration of SO2 is obtained. The gas is fed into the aqueous alkaline solution together with the flue gas so as to improve the efficiency of the process.

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