Methods for chemically reducing nitrogen oxides

Details Methods for chemically reducing nitrogen oxides Methods for chemically reducing nitrogen oxides

1984-11-20

1986-12-02

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

423239, 423351, C01B 2100, B01J 800

Patent

active

046264175

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.

REFERENCES:
patent: 3565575 (1971-02-01), Warshaw
patent: 3801696 (1974-04-01), Mark
patent: 3826810 (1974-07-01), Lawson
patent: 4061597 (1977-12-01), Goldstein et al.
patent: 4119702 (1978-10-01), Azuhata et al.
patent: 4325924 (1982-04-01), Arand et al.

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