Process for removal of nitrogen oxides and sulfur oxides...

Details Process for removal of nitrogen oxides and sulfur oxides... Process for removal of nitrogen oxides and sulfur oxides...

B - Operations, Transporting

01

D

23/348

B01D 53/14 (2006.01) B01D 53/60 (2006.01)

Patent

CA 1190380

PROCESS FOR REMOVAL OF HYDROGEN OXIDES AND SULFUR OXIDES FROM WASTE GASES. ABSTRACT. A process for removal of nitrogen oxides and sulfur oxides from waste gases by contacting the waste gases with a particulate material comprising an alkaline earth based absorbent for sulfur oxides. Essential features are a reaction temperature of 85-145°C, a maximum value of 3 for the ratio of nitrogen oxides to sulfur oxides,and the presence of oxygen and moisture. In its preferred form the process comprises a spray drying-absorption reaction followed by particle separa- tion in a bag house. Removal efficiency is improved by the presence of minor amounts of sodium sulfite together with the alkaline earth based absorbent. Also a special conveyance of material may be applied to improve efficiency.

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