B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
23/353, 165/4
B01D 53/34 (2006.01) B01D 53/56 (2006.01)
Patent
CA 1050735
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. In a series of liquid gas contact zones, the gas stream is first scrubbed with an aqueous solution of ammonium nitrate at a pH of about 0.1 to about 5.0; subse- quently scrubbed with an aqueous solution of ammonium nitrate at a pH of about 7.5 to about 8.5; and thereafter scrubbed with water. The resulting scrubbed gas stream of reduced nitrogen oxides content may be safely discharged to the atomsphere without causing air pollution, the nitrogen oxides content being below imposed standards. The 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 contact zones having an inlet for the introduc- tion 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 component, each of the plurality of contact zones including an inlet for the introduction of a scrubb- ing liquid and an outlet for the withdrawal of spent scrubbing liquid and gas, the scrubbing 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 scrubbing liquid from the gas stream, the gas stream then being forwarded from each contact zone to the next succeed- ing contact zone.
221716
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