Method for removing nitrogen oxides from a gas mixture

Details Method for removing nitrogen oxides from a gas mixture Method for removing nitrogen oxides from a gas mixture

B - Operations, Transporting

01

D

23/353

B01D 53/34 (2006.01)

Patent

CA 1061519

METHOD FOR REMOVING NITROGEN OXIDES FROM A GAS MIXTURE ABSTRACT A method is described for removing nitrogen oxides from a gas containing nitrogen oxides. Contacting the gas mixture with an aqueous scrubbing solution containing at least ferrous salt and alkali salt of sulfurous acid, said ferrous salt content being at least 0.02% by weight and said alkali salt of sulfurous acid content being at least 0.2% by weight to absorb the nitrogen oxides, thereby forming an alkali salt of imidodisulfonic acid. The solution containing the alkali salt of imidodisulfonic acid is then cooled to solidify the alkali salt, which is separated from the solution.

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