Removal of nitrogen oxides from gas containing same by...

Details Removal of nitrogen oxides from gas containing same by... Removal of nitrogen oxides from gas containing same by...

B - Operations, Transporting

01

D

23/353

B01D 53/34 (2006.01) C01B 21/02 (2006.01) C01B 21/20 (2006.01)

Patent

CA 1058829

REMOVAL OF NITROGEN OXIDES FROM GAS CONTAINING SAME BY CONVERSION TO HARMLESS NITROGEN ABSTRACT OF THE DISCLOSURE: A method of effectively removing nitrogen oxides which are entrained in a gas, wherein a nitrogen oxide-containing gas is brought into contact with an aqueous solution which contains at least ferrous salt and sulfurous acid alkali salt to have the nitrogen oxides absorbed in the solution in the form of imidodi- sulfonic acid alkali salt, hydrolyzing the imidodisulfonic acid alkali salt to obtain a hydrolyze-formed solution, and adding nitrous acid, nitrous acid anhydride, or nitrite to the hydrolyze- formed solution to generate nitrogen.

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