Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1991-03-26
1992-01-28
Heller, Gregory A.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
C01B 1700
Patent
active
050842552
ABSTRACT:
Sulfur dioxide is removed from flue gases using an aqueous solution of magnesium components in a wet scrubber, with oxidation of a portion of the aqueous discharge from the scrubber. Calcium sulfate is added to the portion of aqueous discharge at the oxidizer to form an oxidized aqueous effluent containing calcium sulfate solids and dissolved magnesium sulfate. The oxidized aqueous effluent is regenerated by addition of lime, in a regeneration tank, which precipitates calcium sulfate as gypsum, with gypsum returned to the oxidizer as the calcium sulfate added thereto. Preferably, the aqueous discharge from the scrubber is divided, with a major portion passed to a separator to remove gypsum, therefrom, while a minor portion is passed to the regeneration tank. Magnesium sulfate solution, after separation of gypsum from the major portion may also be fed to the regeneration tank.
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Benson Lewis B.
College John W.
Dravco Lime Company
Heller Gregory A.
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