Process for the removal of nitrogen oxides from nitric acid plan

Details Process for the removal of nitrogen oxides from nitric acid plan Process for the removal of nitrogen oxides from nitric acid plan

1984-07-09

1985-12-31

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

423390, 423393, 423394, C01B 2100, C01B 2138, C01B 2140

Patent

active

045620520

ABSTRACT:
The present invention involves a process for removing nitrogen oxides from an off gas stream, such as nitric acid plant tail gas. The off gas is scrubbed with concentrated nitric acid to remove nitrogen oxides to a concentration below about 200 ppm. The nitric acid used in the scrubbing step is subsequently stripped of recovered nitrogen oxides which can be recycled back to a nitric acid plant. The oxidized nitric acid is recovered as concentrated nitric acid which can be used in the initial scrubbing step and/or recovered as product.

REFERENCES:
patent: 4053555 (1977-10-01), Bolme
patent: 4118460 (1978-10-01), Bolme
patent: 4138470 (1979-02-01), Bolme
patent: 4312852 (1982-01-01), Dewey
Handbook of Chemistry and Physics; 44th edition; Chemical Rubber Pub. Co., Cleveland, Ohio, (1963), pp. 2047-2048.

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