Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Reexamination Certificate
2007-02-20
2007-02-20
Vanoy, Timothy C. (Department: 1754)
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
C423S243110, C423S244070, C423S555000, C423S635000, C423S636000, C423S155000, C423S158000, C423S164000, C423S166000, C423S169000, C423S170000
Reexamination Certificate
active
11324620
ABSTRACT:
The present invention provides methods and apparatus for treating flue gas containing sulfur dioxide using a scrubber, and more particularly relates to recovering gypsum and magnesium hydroxide products from the scrubber blowdown. The gypsum and magnesium hydroxide products are created using two separate precipitation reactions. Gypsum is crystallized when magnesium sulfate reacts with calcium chloride. Magnesium hydroxide is precipitated when magnesium chloride from the gypsum crystallization process reacts with calcium hydroxide. The process produces a high quality gypsum with a controllable pH and particle size distribution, as well as high quality magnesium hydroxide.
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Allegheny Energy, Inc.
Eckert Seamans Cherin & Mellott , LLC
Silverman Arnold B.
Vanoy Timothy C.
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