The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 28, 1992
Filed:
Mar. 26, 1991
John W College, Pittsburgh, PA (US);
Lewis B Benson, Coraopolis, PA (US);
Dravco Lime Company, Pittsburgh, PA (US);
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.