Removal of sulfur dioxide from gas streams

Details Removal of sulfur dioxide from gas streams Removal of sulfur dioxide from gas streams

1992-09-29

1993-11-16

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

42324301, C01B 1720, C01B 1700

Patent

active

052621391

ABSTRACT:
Processes for the removal of sulfur dioxide from gas streams, e.g., stack gases, are disclosed wherein the absorption occurs in the presence of a diamine. The first amine group, i.e., stronger amine group, of the diamine is in salt form, having sulfite anions associated therewith, and absorbs by a sulfite/bisulfite absorption mechanism. The second amine groups absorbs sulfur dioxide in free base form. The sulfite salt on the first amine group is maintained by controlling the level of heat stable salts in the absorbent. Both the first and second amine groups can be conveniently regenerated together, e.g., by steam stripping.

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