Process for cleaning flue gas

Details Process for cleaning flue gas Process for cleaning flue gas

1979-08-20

1981-05-12

Thomas, Earl C.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

423242, 423243, 423542, B01D 5334

Patent

active

042671558

ABSTRACT:
A flue gas containing SO.sub.x, NO.sub.x and O.sub.2 is washed with an alkaline aqueous solution containing a NO.sub.x removal catalyst to form the salts of 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 SO.sub.2 is obtained. The gas is fed into the alkaline aqueous solution together with the flue gas so as to improve the efficiency.

REFERENCES:
patent: 4044101 (1977-01-01), Hisamatsu et al.
patent: 4186176 (1980-01-01), Kitamura et al.

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