Chemistry of inorganic compounds – Sulfur or compound thereof – Oxygen containing
Patent
1989-05-03
1991-07-09
Straub, Gary P.
Chemistry of inorganic compounds
Sulfur or compound thereof
Oxygen containing
423239, 423522, 423531, C01B 2120, C01B 1790, C01B 1794
Patent
active
050304364
ABSTRACT:
Contaminants in spent nitric-sulfuric nitration acid can be removed by mixing the spent acid with urea and heating to 75.degree.-150.degree. C. Off-gas from the spent acid/urea reaction is passed through a Group IB, VB, VIB or VIII metal containing catalyst to decompose nitrous oxides and the so-treated off-gas is contacted with spent acid, denitrated spent acid, or fresh sulfuric acid, and optionally air (i.e. oxygen), to absorb oxides of nitrogen. The spent acid scrubbing fluid is then subjected to the same process for removing contaminants.
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Daniels George A.
Hane J. Keitt
Malfer Dennis J.
Steadman J. Francis
Wilson, Jr. R. Woodrow
Ethyl Corporation
Kalinchak Stephen G.
Sieberth John F.
Straub Gary P.
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