Method for removing sulfur oxide from waste gases and recovering elemental sulfur
A continuous catalytic fused salt extraction process is described for removing sulfur oxides from gaseous streams. The gaseous stream is contacted with a molten potassium sulfate salt mixture having a dissolved catalyst to oxidize sulfur dioxide to sulfur trioxide and molten potassium normal sulfate to solvate the sulfur trioxide to remove the sulfur trioxide from the gaseous stream. A portion of the sulfur trioxide loaded salt mixture is then dissociated to produce sulfur trioxide gas and thereby regenerate potassium normal sulfate. The evolved sulfur trioxide is reacted with hydrogen sulfide as in a Claus reactor to produce elemental sulfur. The process may be advantageously used to clean waste stack gas from industrial plants, such as copper smelters, where a supply of hydrogen sulfide is readily available.
- Assignee:
- Battelle Memorial Inst.
- Patent Number(s):
- US 4041142
- OSTI ID:
- 6436906
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
320305 -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
42 ENGINEERING
424000* -- Engineering-- Pollution Control Equipment-- (1980-1989)
AIR POLLUTION CONTROL
ALKALI METAL COMPOUNDS
CATALYSIS
CHALCOGENIDES
CHEMICAL REACTIONS
DESULFURIZATION
ELEMENTS
EQUIPMENT
FLUE GAS
GASEOUS WASTES
INDUSTRIAL PLANTS
NONMETALS
OPERATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
POTASSIUM COMPOUNDS
POTASSIUM SULFATES
RECOVERY
SULFATES
SULFUR
SULFUR COMPOUNDS
SULFUR OXIDES
WASTES