Urea reduction of NO.sub.x in combustion effluents

Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component

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B01D 5334

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active

042083869

ABSTRACT:
Method for reducing NO.sub.x in combustion effluents comprising introducing urea at elevated temperatures in the presence of oxygen, either as a solid or solution in amounts sufficient to reduce the NO.sub.x concentration. Conveniently, the urea may be introduced as a solid powder or as a solution in a hydroxylic solvent, at temperatures in excess of 1300.degree. F. and in the presence of at least 0.1 volume percent oxygen.
This invention was made under contract with or supported by the Electric Power Research Institute.

REFERENCES:
patent: 3565575 (1971-02-01), Warshaw
patent: 3801696 (1974-04-01), Mark
patent: 3846981 (1974-11-01), Paczkowski
patent: 3867507 (1975-02-01), Myerson
patent: 3900554 (1975-08-01), Lyon
patent: 4061597 (1977-12-01), Goldstein et al.
Hach's Chem. Dict.-4th Ed.-1969-pp. 702, 703.
Perry's Chem. Engr. Handbook-4th Ed.-1963-pp. 3-42.

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