Process for removing sulfur dioxide and nitrogen oxides from flue gases
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United States of America Patent
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Apr 6, 1993
Grant Date -
N/A
app pub date -
Aug 29, 1991
filing date -
Aug 29, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for removing sulfur dioxide and nitrogen oxide from flue gases in a wet scrubbing system using lime to remove the sulfur dioxide and ferrous-EDTA to remove the nitrogen oxides, where an initial reducing agent, such as sodium sulfide, and an antioxidant, such as hydrazine, are added to the scrubbing system, with oxidation of the ferrous-EDTA to ferric-EDTA curtailed while removal of nitrogen oxides is increased.
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