Method for purifying industrial exhaust gases

Details Method for purifying industrial exhaust gases Method for purifying industrial exhaust gases

B - Operations, Transporting

01

D

23/350

B01D 53/34 (2006.01) B01D 53/60 (2006.01)

Patent

CA 1060634

Title of the Invention Method for purifying industrial exhaust gases Abstract of the Disclosure A method for purifying industrial exhaust gases containing nitrogen oxides and sulfur oxides, by treating the gases with a circulating absorbing solution containing Fe-EDTA complex salt and ammonium sulfite is provided. The treatment comprises a combination of the main absorbing step with the following steps: (a) a circulation step of the absorbing solution in part or total, (b) an oxidation step of sulfite, (c) a separa- tion step of EDTA, (d) a decomposition step of dithionate, etc., (e) a separation step of iron compound, and (f) a separation step of ammonium sulfate. According to this invention, a long time continuous operation for said purification is possible.

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