Absorption of sulfur oxides from hot gases

Patent · Tue Apr 15 04:00:00 EST 1980

OSTI ID:5867093

Kohl, A L

A process is described for removing sulfur oxides from a hot gas by sequential absorption of the sulfur oxides in two zones. In each zone the hot gas is contacted with an aqueous scrubbing medium which may be a solution or slurry containing an absorbent for the sulfur oxides. The absorbent is selected from the group consisting of alkali metal carbonates, bicarbonates and mixtures thereof. The preferred absorbent is sodium carbonate. The aqueous solution is introduced into the first zone in an amount to produce (1) a dry powder reaction product containing alkali metal sulfites, and sulfates, substantially free of unreacted absorbent and (2) a substantially water-unsaturated gaseous reaction product of reduced sulfur oxide content. The gaseous reaction product of reduced sulfur oxide content is transferred into the second zone where it is contacted with a sufficient amount of an aqueous solution of absorbent to provide (1) a gaseous reaction product substantially free of sulfur oxide and (2) an aqueous solution containing alkali metal sulfites, sulfates and unreacted absorbent, which solution is used as at least a part of the aqueous solution fed into the first zone.

• Assignee: Rockwell International Corp
• Patent Number(s): US 4198380
• OSTI ID: 5867093
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
02 PETROLEUM
020800 -- Petroleum-- Waste Management
03 NATURAL GAS
030700 -- Natural Gas-- Waste Management
ADSORPTION
AIR POLLUTION CONTROL
ALKALI METAL COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
CONTROL
GASEOUS WASTES
HOT GAS CLEANUP
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
PURIFICATION
REMOVAL
SCRUBBING
SODIUM CARBONATES
SODIUM COMPOUNDS
SORPTION
SULFUR COMPOUNDS
SULFUR OXIDES
WASTES