C - Chemistry – Metallurgy – 01 – C
Patent
C - Chemistry, Metallurgy
01
C
23/353
C01C 1/18 (2006.01) B01D 53/56 (2006.01)
Patent
CA 1088728
METHOD AND APPARATUS FOR REMOVING NITROGEN OXIDES FROM A GAS STREAM ABSTRACT OF THE DISCLOSURE 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 reacted, under steady state conditions with an aqueous solution of ammonium nitrate at a pH of about 0.1 to about 3.5. The gas stream can be further reacted with an aqueous solution of ammonium nitrate at a pH of about 7.5 to about 8.5; and thereafter with water, preferably slightly acidified. 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. Further the in- ventive apparatus useful for carrying out the above method includes, in combination, a plurality of packed gas-liquid contact zones, serially arranged, with the first of the con- tact zones having an inlet for the introduction of a gas stream rich in the component to be removed, e.g., nitrogen oxides and the last of the contact zones having an outlet for the withdrawal of a gas stream lean in such gaseous com- ponent, each of the plurality of contact zones including an inlet for the introduction of a liquid medium and an outlet for the withdrawal of spent liquid medium and gas, the liquid and gas in each contact zone passing concurrently therethrough; and separator means associated with each of the plurality of contact zones adjacent the outlet thereof to separate spent liquid medium from the gas stream, the gas stream then being forwarded from each contact zone to the next succeeding con- tact zone.
261512
Ethington Donald
Goodpasture Inc.
Meredith & Finlayson
LandOfFree
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