Apparatus for treatment of nitrogen oxides
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United States of America Patent
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Dec 1, 1992
Issued Date -
N/A
app pub date -
Aug 31, 1990
filing date -
Jan 26, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A nitric acid producing plant including an absorber and a closed vessel. Nitric acid having nitrous acid in solution is produced in the absorber by reacting to the oxides of nitrogen derived from the decomposition of ammonia with water. There is also an oxygen cylinder which supplies oxygen under pressure differential to the vessel. The pressure of the stagnant oxygen in the vessel exceeds atmospheric pressure. The plant also includes means for passing the nitric acid solution from the absorber to the vessel under positive differential pressure and means for recycling to the absorber the product of the reaction of the nitric acid solution and the oxygen. The liquid which is recycled to the absorber absorbs NO at a higher rate than NO.sub.2.
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