Process for the recovery of NO from the waste gas resulting from

Details Process for the recovery of NO from the waste gas resulting from Process for the recovery of NO from the waste gas resulting from

1989-08-24

1990-11-20

Stoll, Robert L.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Carbon dioxide or hydrogen sulfide component

423235, C07B 1716, C07B 3120, C07B 2100

Patent

active

049717766

ABSTRACT:
A process for the complete recovery of NO from the waste gas of ammonium nitrite production, in which gases containing nitrogen oxides are absorbed in a first stage in a solution of ammonium carbonate and/or ammonium bicarbonate to form ammonium nitrite solutions and the resulting waste gas containing carbon dioxide is absorbed in a second stage in an ammoniacal, aqueous solution to form ammonium carbonate and/or ammonium bicarbonate which is returned as such to the first absorption stage, and the waste gas containing carbon dioxide is brought into contact with a sulphuric acid of medium concentration containing from 0.1-5% by weight, preferably from 0.2 to 1.5% by weight of nitric acid before the carbon dioxide is introduced into the second absorption stage.

REFERENCES:
Ullmanns Encyclopedia of Chemical Technology, no translation.

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