| 摘要 |
REMOVAL OF NITROGEN OXIDES FROM GAS CONTAINING SAME BY CONVERSION TO HARMLESS NITROGEN 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 imidodisulfonic 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 hydrolyzeformed solution to generate nitrogen. |
