Method for removing nitrogen oxides from a gas stream

Details Method for removing nitrogen oxides from a gas stream Method for removing nitrogen oxides from a gas stream

1979-03-15

1980-08-26

Peters, G. O.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

423396, C01C 118

Patent

active

042195349

ABSTRACT:
A gas stream containing nitrogen oxides, such as the tail gas from a nitric acid plant, is treated to reduce the nitrogen oxides content thereof. The method results in the production of an aqueous solution of ammonium nitrate. In a liquid-gas contact apparatus, the gas stream is first reacted, under steady state conditions, in counter-current flow, with an aqueous solution of ammonium nitrate at a pH of about 0.01 to about 0.5. The gas stream is then further reacted with an aqueous solution of ammonium nitrate at a pH of about 8.1 to about 8.5; and thereafter with water, preferably slightly acidified to a pH of 6.0 to 6.5. The resulting gas stream of reduced nitrogen oxides content may be safely discharged to the atmosphere without causing air pollution, the nitrogen oxides content being below imposed standards.

REFERENCES:
patent: 2102136 (1937-12-01), Shapleigh
patent: 3453071 (1969-07-01), Schmitt
patent: 4151265 (1979-04-01), Ethington

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