Removal of sulfur dioxide from flue gas

Patent · Tue Jun 17 04:00:00 EDT 1980

OSTI ID:5721417

Gorin, E

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
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800 -- Coal
Lignite
& Peat-- Waste Management
42 ENGINEERING
424000* -- Engineering-- Pollution Control Equipment-- (1980-1989)
AIR POLLUTION CONTROL
ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
DESIGN
DESULFURIZATION
DISPERSIONS
EQUIPMENT
FLUE GAS
GASEOUS WASTES
MIXTURES
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
POTASSIUM CARBONATES
POTASSIUM COMPOUNDS
REGENERATION
REMOVAL
SCRUBBERS
SCRUBBING
SODIUM CARBONATES
SODIUM COMPOUNDS
SOLUTIONS
SULFATES
SULFIDES
SULFITES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
THIOSULFATES
WASTES