Abatement of NO.sub.x from hydroxylamine disulfonate process
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United States of America Patent
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Feb 26, 1991
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N/A
app pub date -
Dec 28, 1988
filing date -
Dec 28, 1988
priority date (Note) -
Expired
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Abstract
In the production of hydroxylamine disulfonate diammonium salt (DS) comprising reacting ammonium nitrite with ammonium bisulfite and sulfur dioxide in an absorption reactor whereby emission gases comprising NO.sub.x, particularly NO, are released as a result of side reactions, the method of treating said emission gases to reduce the concentration of NO comprises adding NO.sub.2 to the emission gases and contacting the mixture of NO.sub.2 and emission gases with an aqueous alkali solution sufficiently to form nitrite and nitrate ions in said alkali solution.
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