Method of simultaneously removing sulfur dioxide and nitrogen oxides from exhaust gases
A method is disclosed for simultaneously removing sulfur dioxide and nitrogen oxides from an exhaust gas which comprises the steps of: contacting the exhaust gas with an aqueous absorbing solution containing an iron chelate complex and an alkali metal sulfite to form alkali metal sulfur oxides comprising an alkali metal dithionate in the aqueous absorbing solution; separating the alkali metal sulfur oxides formed and accumulated from part or the whole of the aqueous absorbing solution by crystallization; and subjecting the alkali metal sulfur oxides separated together with a carbonaceous material to decomposition-reduction reaction at a temperature of at least about 700/sup 0/C to form an alkali metal sulfide and a gas comprising sulfur dioxide and carbon dioxide.
- Assignee:
- Asahi Kasei Kogyo K K (Japan)
- Patent Number(s):
- US 4186176
- OSTI ID:
- 5586847
- Resource Relation:
- Patent Priority Date: Priority date 4 Aug 1977, Japan; Other Information: PAT-APPL-927249
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
EXHAUST GASES
DENITRIFICATION
DESULFURIZATION
ABSORPTION
ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
CHELATES
COMBUSTION PRODUCTS
DECOMPOSITION
IRON COMPLEXES
POLLUTION CONTROL EQUIPMENT
REDUCTION
SEPARATION PROCESSES
SULFUR COMPOUNDS
CHEMICAL REACTIONS
COMPLEXES
DISPERSIONS
EQUIPMENT
FLUIDS
GASEOUS WASTES
GASES
MIXTURES
SOLUTIONS
TRANSITION ELEMENT COMPLEXES
WASTES
424000* - Engineering- Pollution Control Equipment- (1980-1989)