Process for the oxidative purification of waste gases containing

Details Process for the oxidative purification of waste gases containing Process for the oxidative purification of waste gases containing

1992-10-30

1994-11-22

Langel, Wayne

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

4232392, 423393, 423394, C01B 2138

Patent

active

053667115

ABSTRACT:
A process is described for the removal of nitrogen oxides from waste gases with the recovery of nitric acid or a nitrate solution. The waste gas is reacted with hydrogen peroxide in an amount appropriate to the desired degree of removal of nitrogen oxides, on a catalyst, at a temperature of less than 800.degree. C., preferably in the range of 20.degree. to 100.degree. C., to give the valuable product, nitric acid or a nitrate solution. This may be done in accordance with the invention by bringing the hydrogen peroxide as a solution, i.e., in the liquid phase, into contact with the catalyst through which the waste gas is flowing. The reaction product is either utilized in a gaseous form or processed to nitric acid or a nitrate solution. Alternatively, the hydrogen peroxide may be introduced in a gaseous form, using a honeycombed catalyst, and wherein the hydrogen peroxide is present in at least one half of the stoichiometrically determined amount. Regardless of whether the hydrogen peroxide is introduced in a liquid or vapor form, the resulting nitric acid solution may be scrubbed, preferably with a nitrate salt solution, to provide the concentrated product.

REFERENCES:
patent: 4341747 (1982-07-01), Downey
patent: 4367204 (1983-01-01), Klopp et al.
patent: 4425313 (1984-01-01), Cooper
patent: 5112587 (1992-05-01), von Wedel et al.

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