Lane, Aitken, Dunner & Ziems
Method of removing nitrogen oxides from a gas containing nitrogen oxides
 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 one ferrous salt and one sulfurous acid alkali salt to absorb the nitrogen oxides in the solution in the form of imidodisulfonic acid alkali salt, hydrolyzing the imidodisulfonic acid alkali salt to obtain a hydrolyzate-containing solution, and adding nitrous acid, nitrous acid anhydride, or nitrite to the hydrolyzate-containing solution to generate nitrogen. 
Kureha Kagaku Kogyo Kabushiki Kaisha
B C
B01D C01C
inventional inventional
Shigeru Koji Tetsuya Tadashi
Saitoh Konno Watanabe Nakamura