Treatment of NOx-containing gas streams
AssigneeATI Properties, Inc.
InventorJames A. Moore
Life of this patent
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Abstract
Methods and systems for treating a gas stream comprising NOx are disclosed. In one embodiment of the method, the gas stream comprising NOx is reacted with ozone to form oxidation products including nitrogen sesquioxide and nitrogen pentoxide. At least a portion of the nitrogen sesquioxide and nitrogen pentoxide is reacted with water to form nitric acid, and a solubilized form of the nitric acid is collected and may be reused or otherwise utilized. Systems for conducting the method also are disclosed.
Claims15
A method of treating a gas stream comprising NOx, the method comprising:
- generating a gas stream comprising NOx from an acid pickling solution in an acid pickling tank, bath, or spray;
- contacting the gas stream comprising NOx with ozone in a first chamber, thereby forming oxidation products including nitrogen sesquioxide and nitrogen pentoxide;
- directly following the preceding step, reacting at least a portion of the nitrogen sesquioxide and nitrogen pentoxide with water in the first chamber, thereby forming nitric acid in the first chamber;
- collecting at least a portion of the nitric acid in a second chamber in direct fluid communication with the first chamber;
- and
- recycling the nitric acid from the second chamber into the acid pickling tank, bath, or spray;
- wherein the gas stream comprising NOx is not treated with a caustic scrubbing solution in a scrubber between generating the gas stream comprising NOx and recycling the nitric acid.
A method of treating a gas stream comprising NOx, the method comprising:
- generating a gas stream comprising NOx from a pickling solution;
- contacting the gas stream comprising NOx with ozone in a first chamber to form oxidation products including nitrogen sesquioxide and nitrogen pentoxide;
- directly following the preceding step, reacting at least a portion of the nitrogen sesquioxide and nitrogen pentoxide with water to form nitric acid;
- collecting at least a portion of the nitric acid in a second chamber in direct fluid communication with the first chamber;
- and
- recycling the nitric acid from the second chamber into a process or apparatus that generated the gas stream comprising NOx;
- wherein the gas stream comprising NOx is not treated with a caustic scrubbing solution in a scrubber between generating the gas stream comprising NOx and recycling the nitric acid.
Dependencies are inferred from the claim text.