Removal of sulfur dioxide from flue gas
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.
- Assignee:
- Conoco Inc
- Patent Number(s):
- US 4208395
- OSTI ID:
- 5721417
- Resource Relation:
- Patent File Date: Filed date 5 Dec 1978
- Country of Publication:
- United States
- Language:
- English
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Absorption of sulfur oxides from flue gas
Regenerative sulfur dioxide scrubbing system
Related Subjects
01 COAL, LIGNITE, AND PEAT
FLUE GAS
DESULFURIZATION
SCRUBBERS
DESIGN
SULFUR DIOXIDE
AIR POLLUTION CONTROL
AQUEOUS SOLUTIONS
CHEMICAL REACTIONS
POLLUTION CONTROL EQUIPMENT
POTASSIUM CARBONATES
REGENERATION
REMOVAL
SCRUBBING
SODIUM CARBONATES
SULFATES
SULFIDES
SULFITES
THIOSULFATES
ALKALI METAL COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
CONTROL
DISPERSIONS
EQUIPMENT
GASEOUS WASTES
MIXTURES
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POTASSIUM COMPOUNDS
SODIUM COMPOUNDS
SOLUTIONS
SULFUR COMPOUNDS
SULFUR OXIDES
WASTES
424000* - Engineering- Pollution Control Equipment- (1980-1989)
010800 - Coal
Lignite
& Peat- Waste Management