Desulfurization of flue gases with complete sulfite oxidation
Flue gas containing sulfur dioxide is purified (And the sulfur content thereof is recovered in elemental form) by scrubbing the gas with aqueous sodium aluminate-sodium hydroxide solution thereby forming an underflow suspension consisting essentially of sodium and aluminum sulfites and sulfates and fly ash; oxidizing the sulfites to sulfates; evaporating the free water present; reducing the resulting apparently dry mixture of sodium and aluminum sulfates by the action of reactive hydrogen and a carbonaceous reducing agent thereby forming a solid mixture of a sodium oxide and sodium aluminate and a gaseous mixture comprising sulfur dioxide, sulfur, and hydrogen sulfide; condensing said sulfur; and inter-reacting said sulfur dioxide and hydrogen sulfide to provide elemental sulfur. The solid mixture is dissolved in water to regenerate the scrubbing solution, which is then recycled. The solution is filtered at any convenient point to remove fly ash and any other solids present.
- Assignee:
- EDB-83-145643
- Patent Number(s):
- US 4382010
- OSTI ID:
- 5888284
- Resource Relation:
- Patent File Date: Filed date 21 Jul 1980; Other Information: PAT-APPL-170702
- Country of Publication:
- United States
- Language:
- English
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Process for the desulfurization of flue gases
Process for the desulfurization of flue gases
Related Subjects
02 PETROLEUM
42 ENGINEERING
20 FOSSIL-FUELED POWER PLANTS
FLUE GAS
DESULFURIZATION
SULFITES
OXIDATION
SULFUR DIOXIDE
AIR POLLUTION CONTROL
ALUMINATES
RECYCLING
SCRUBBING
SODIUM HYDROXIDES
WASTE MANAGEMENT
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
GASEOUS WASTES
HYDROGEN COMPOUNDS
HYDROXIDES
MANAGEMENT
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
SODIUM COMPOUNDS
SULFUR COMPOUNDS
SULFUR OXIDES
WASTES
010800* - Coal
Lignite
& Peat- Waste Management
020800 - Petroleum- Waste Management
424000 - Engineering- Pollution Control Equipment- (1980-1989)
200202 - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions