Process for controlling ammonia slip in the reduction of sulfur dioxide emission
Patent 6221325 Issued on April 24, 2001. Estimated Expiration Date: 
September 8, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 8, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3883639 Process for the simultaneous absorption of sulfur oxides and production of ammonium sulfate Process for the simultaneous absorption of sulfur oxides and production of ammonium sulfate Patent #: 5362458 InventorsAssigneeApplicationNo. 149211 filed on 09/08/1998US Classes:423/243.06, Ammonium compound reactant423/243.01Utilizing aqueous reactant to remove or modify sulfur or sulfur containing componentExaminersPrimary: Straub, Gary P.Assistant: Vanoy, Timothy C. Attorney, Agent or FirmForeign Patent References
International ClassB01D 053/50AbstractA wet flue gas desulfurization process for removing sulfur dioxide from flue gases. The process utilizes an ammonium sulfate scrubbing solution containing free dissolved ammonia as the reagent for the desulfurization process to produce ammonium sulfate as a valuable byproduct. The scrubbing solution contacts the flue gases and absorbs sulfur dioxide within an absorber of a flue gas scrubbing apparatus, and is then accumulated in a tank where the absorbed sulfur dioxide is reacted with oxygen and ammonia to produce ammonium sulfate. The scrubbing solution has a concentration of greater than 46% ammonium sulfate so as to have suspended solids of ammonium sulfate precipitate, preferably 1% to 20% suspended solids. |
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