Removal of nitrogen oxides in form of ammonium sulfate from...

Details Removal of nitrogen oxides in form of ammonium sulfate from... Removal of nitrogen oxides in form of ammonium sulfate from...

B - Operations, Transporting

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B01D 53/34 (2006.01) B01D 53/14 (2006.01) C01B 21/20 (2006.01) C01C 1/245 (2006.01)

Patent

CA 1058830

REMOVAL OF NITROGEN OXIDES IN FORM OF AMMONIUM SULFATE FROM NITROGEN OXIDES-CONTAINING GAS ABSTRACT OF THE DISCLOSURE A method of removing nitrogen oxides from a gas containing nitrogen oxides effectively in the form of ammonium sulfate, wherein a nitrogen oxides-containing gas is brought into contact with an aqueous solution which contains at least a ferrous salt and a sulfurous acid alkali salt to have the nitrogen oxides absorbed in the solution in the form of an alkali salt imidodisulfonic acid, and then the thus formed alkali salt of imidodi- sulfonic acid is converted into ammonium sulfate by hydrolysis at a temperature higher than 100°C after separation and recovery of the salt from the solution.

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