Process for the production of nitric acid

Details Process for the production of nitric acid Process for the production of nitric acid

1975-12-17

1977-06-21

Peters, G. O.

Chemistry of inorganic compounds

Nitrogen or compound thereof

Oxygen containing

423394, C01B 2104

Patent

active

040311872

ABSTRACT:
Nitric acid having a concentration of at least 98% by weight is obtained from a gaseous stream resulting from catalytic oxidation of ammonia and containing nitrogen oxide and steam, by flowing said stream in an oxidation and condensation column in countercurrent with a stream of nitric acid at 40-60 wt.%, recovering nitrogen peroxide at the top of the column, liquefying said peroxide, bringing it into contact with aqueous nitric acid, oxygen and air in a chemical absorption stage, and distilling the resulting superazeotropic nitric acid. A part of the nitric acid discharged from the oxidation column is directly recycled and the remainder is recycled after distillation to give azeotropic acid and remove water, a part of the latter being used for the chemical absorption.

REFERENCES:
patent: 2088057 (1937-07-01), Handforth
patent: 3099531 (1963-07-01), Boynton
patent: 3876752 (1975-04-01), Wendel

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