B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
165/3, 23/348, 2
B01D 53/34 (2006.01) B01D 53/14 (2006.01) B01D 53/60 (2006.01) C01B 17/74 (2006.01) C01B 21/40 (2006.01)
Patent
CA 1293359
Process for removing oxides of nitrogen and sulfur from waste gases Abstract of the Disclosure A process for removing oxides of nitrogen and sulfur from waste gases, in particular from flue gases emitted by power plants, by means of a modified nitrogen oxide-sulfuric acid process for the production of sulfuric acid to obtain marketable nitrogen and sulfur compounds by absorption of more than half the concentration of nitrogen oxide present in the waste gas introduced into said process and desorption of the liquid that contains nitrogen oxide, in which process a) the nitrogen oxide set free is mixed with an oxygen-containing gas to give a gas which is relatively enriched with nitrogen oxide and oxygen and in which nitrogen monoxide oxidises to nitrogen dioxide, and the nitrogen dioxide so obtained and/or nitric acid produced therefrom, as well as a residual content of nitrogen monoxide, is introduced into the main stream of waste gas to be treated, the molar amounts of quadrivalent and pentavalent nitro- gen-oxygen compounds introduced into the system being greater than the molar amount of nitrogen monoxide also introduced, and b) the liquid from which nitrogen oxides have been at least partially removed, or the bulk thereof, is fed back, after passing through the desorption plant, into one or more of the gas treatment towers of the main stream of gas.
488446
Ciba-Geigy Investments Ltd.
Fetherstonhaugh & Co.
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