Gaseous product stream

Details Gaseous product stream Gaseous product stream

1976-10-13

1978-03-28

Peters, G. O.

Chemistry of inorganic compounds

Nitrogen or compound thereof

Oxygen containing

423393, 423235, C01B 2136

Patent

active

040815188

ABSTRACT:
A method for the removal of nitrogen oxides from the off-gases of a nitric acid manufacturing facility. The off-gases containing the nitrogen oxides are first contacted at atmospheric pressure and at a temperature below about 90.degree. F with a countercurrently flowing stream of about 10 to about 35% by weight nitric acid to absorb the nitrogen oxides. The rate of flow of the nitric acid is controlled so that the partial pressure of the nitrogen oxides absorbed in the nitric acid is lower than the partial pressure of the nitrogen oxides in the off-gas feed stream. The nitric acid containing the absorbed nitrogen oxides is then countercurrently contacted with a small amount of air at a temperature between about 60.degree. and about 120.degree. F to liberate the absorbed nitrogen oxides so that they can be returned to the reactor section of a nitric acid plant. The nitric acid being recycled to absorb more nitrogen oxides.

REFERENCES:
patent: 1989267 (1935-01-01), Caro et al.
patent: 3658472 (1972-04-01), Aguinet et al.
patent: 3809744 (1974-05-01), VON Semel
patent: 3927182 (1975-12-01), Powell

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