Desulfurization of flue gases with complete sulfite oxidation

Patent · Tue Dec 22 00:00:00 EST 1981

OSTI ID:5830288

Lurie, D

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: IFI; EDB-82-053615
• Patent Number(s): US 4307069
• OSTI ID: 5830288
• Resource Relation: Patent File Date: Filed date 28 Dec 1978; Other Information: PAT-APPL-973897
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
02 PETROLEUM
FLUE GAS
SCRUBBING
SULFUR
REMOVAL
AQUEOUS SOLUTIONS
DESULFURIZATION
REDOX REACTIONS
SODIUM COMPOUNDS
SULFUR DIOXIDE
ALKALI METAL COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
DISPERSIONS
ELEMENTS
GASEOUS WASTES
MIXTURES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
SOLUTIONS
SULFUR COMPOUNDS
SULFUR OXIDES
WASTES
010800* - Coal
Lignite
& Peat- Waste Management
020800 - Petroleum- Waste Management