Oxygen-enrichment columnar absorption process for making nitric

Details Oxygen-enrichment columnar absorption process for making nitric Oxygen-enrichment columnar absorption process for making nitric

1978-06-15

1980-01-15

Peters, G. O.

Chemistry of inorganic compounds

Nitrogen or compound thereof

Oxygen containing

423393, C01B 2140

Patent

active

041839064

ABSTRACT:
An improved process for the manufacture of nitric acid involving catalytic oxidation of ammonia and passage of the resulting nitric oxide through columnar absorption zones, the improvement particularly comprising oxygen-enrichment of that gas passing through the absorption zones at one or more regions of the zones wherein the absorption reaction is from 50 to 90% complete. Further, the invention contemplates the oxygen-enrichment of bleaching air and a reduction in the rate at which bleaching air or other air is taken to form secondary air. The invention results in improved production rates of nitric acid and reductions in the concentration of nitrogen oxides in vent gas.

REFERENCES:
patent: 1338417 (1920-04-01), Bergue
patent: 1991452 (1935-02-01), Fauser
patent: 2046162 (1936-06-01), Handforth et al.
patent: 3081153 (1963-03-01), Parsons
patent: 3464788 (1969-09-01), LaCroix
patent: 3716625 (1973-02-01), Oberste-Berglaus et al.
patent: 3927182 (1975-12-01), Powell

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