Methods for chemically reducing nitrogen oxides
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United States of America Patent
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Dec 2, 1986
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app pub date -
Nov 20, 1984
filing date -
Sep 29, 1983
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Abstract
Methods are provided for chemically reducing one or more oxides of nitrogen by contacting the nitrogen oxides with a composition containing a urea-sulfuric acid component having a urea-sulfuric acid molar ratio below 2. The urea-sulfuric acid component can be either solid or molten, or it can be dissolved in a suitable solvent. Particularly preferred compositions are those which have relatively low water concentrations and which are characterized by H.sub.2 O/(urea+H.sub.2 SO.sub.4) molar ratios below about 2.5. These methods can be employed to prevent or reduce the emission of nitrogen oxides from liquid systems and to convert nitrogen oxides contained in vapor streams to non-toxic materials, e.g. elemental nitrogen and water. Solutions of the urea-sulfuric acid components which are employed to remove nitrogen oxides from vapor streams may also contain surfactants which facilitate gas-liquid contacting.
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