Process of treating exhaust gas containing nitrogen oxides and sulfur dioxide
Patent
·
OSTI ID:5763377
A process is disclosed for treating an exhaust gas containing NO/sub x/ and SO/sub 2/ comprising bringing the gas into contact with an absorbing solution containing iron chelate salt and potassium sulfite, cooling the solution to crystallize and separate absorption products of potassium imidodisulfonate, potassium dithionate and potassium sulfate, heating the separated products at 250/sup 0/ to 400/sup 0/ C. To decompose the potassium dithionate into potassium sulfate and sulfur dioxide, then decomposing the potassium imidodisulfonate into ammonia and simultaneously reducing the potassium sulfate into potassium polysulfide and potassium carbonate, and converting the potassium polysulfide into hydrogen sulfide, gaseous sulfur and potassium carbonate.
- Assignee:
- Kureha Kagaku Kogyo K K (Japan)
- Patent Number(s):
- US 4288421
- OSTI ID:
- 5763377
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
20 FOSSIL-FUELED POWER PLANTS
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
ABSORPTION
AIR POLLUTION CONTROL
ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
CHALCOGENIDES
CHELATES
CHEMICAL REACTIONS
COMPLEXES
CONTROL
COOLING
CRYSTALLIZATION
DECOMPOSITION
DENITRIFICATION
DESIGN
DESULFURIZATION
DISPERSIONS
EQUIPMENT
FLUE GAS
GASEOUS WASTES
HEATING
IRON COMPLEXES
MIXTURES
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
POTASSIUM COMPOUNDS
REDUCTION
SEPARATION PROCESSES
SOLUTIONS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TRANSITION ELEMENT COMPLEXES
WASTES
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
ABSORPTION
AIR POLLUTION CONTROL
ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
CHALCOGENIDES
CHELATES
CHEMICAL REACTIONS
COMPLEXES
CONTROL
COOLING
CRYSTALLIZATION
DECOMPOSITION
DENITRIFICATION
DESIGN
DESULFURIZATION
DISPERSIONS
EQUIPMENT
FLUE GAS
GASEOUS WASTES
HEATING
IRON COMPLEXES
MIXTURES
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
POTASSIUM COMPOUNDS
REDUCTION
SEPARATION PROCESSES
SOLUTIONS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TRANSITION ELEMENT COMPLEXES
WASTES