Removal of sulfur dioxide from flue gas

Details Removal of sulfur dioxide from flue gas Removal of sulfur dioxide from flue gas

1978-12-05

1980-06-17

Peters, G. O.

Chemistry of inorganic compounds

Sulfur or compound thereof

Elemental sulfur

423242, C01B 1704

Patent

active

042083958

ABSTRACT:
An improvement is provided in the regeneration system of aqueous regenerative processes for the removal of SO.sub.2 from SO.sub.2 -containing gas streams which have a scrubbing system containing (1) a scrubbing zone through which a recirculating stream of sodium or potassium thiosulfate solution continuously passes as a vehicle for the SO.sub.2 absorbent, sodium or potassium carbonate, under conditions favorable to the formation of sulfite by the reaction of carbonate and SO.sub.2 and (2) a thiosulfate generation zone in which the sulfite is converted by reaction with a sulfide to thiosulfate. The improvement comprises converting, in a regeneration system, the net make of thiosulfate to a mixture of sulfide and carbonate by first converting the thiosulfate to sulfate, then reducing the sulfate to sulfide; and thereafter partially carbonating the sulfide to form a mixture of sulfide and carbonate for return to the scrubbing system.

REFERENCES:
patent: 1944978 (1934-01-01), Hansen
patent: 3937787 (1976-02-01), Gorin et al.
patent: 3987147 (1976-10-01), Guerrieri
patent: 4008310 (1977-02-01), Gorin
patent: 4079119 (1978-03-01), Nicholson
patent: 4122148 (1978-10-01), Nicholson

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