Process for removal of nitrogen oxides and sulfur oxides from wa

Details Process for removal of nitrogen oxides and sulfur oxides from wa Process for removal of nitrogen oxides and sulfur oxides from wa

1982-05-28

1984-04-10

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

423235, 423242, 423244, B01J 800, C01B 2100, C01B 1700

Patent

active

044420790

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.degree.-145.degree. 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 separation 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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