Process for reduction of sulfur dioxide emission from combustion gases combined with production of potassium sulfate
Patent 5624649 Issued on April 29, 1997. Estimated Expiration Date: 
April 26, 2015. 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.
April 26, 2015. 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 2233841 3927178 Process for producing K3 H(SO4)2 crystals and potassium sulfate crystals Process for the simultaneous absorption of sulfur oxides and production of ammonium sulfate Patent #: 5362458 InventorAssigneeApplicationNo. 430940 filed on 04/26/1995US Classes:423/243.11, And subsequent reactive treatment to remove sulfur from spent reactant423/199, Sulfating423/243.06Ammonium compound reactantExaminersPrimary: Simmons, David A.Assistant: Gray, Linda Attorney, Agent or FirmInternational ClassC01D 005/02AbstractA wet flue gas desulfurization process and system are provided for removing sulfur dioxide from flue gases produced by processing operations of the type carried out in utility and industrial plants. In particular, the desulfurization process utilizes an ammonia-based solution having a free ammonia constituent that reacts with sulfur dioxide to generate an ammonium sulfate solution that can be further reacted to produce potassium sulfate, a valuable fertilizer. A second byproduct of this process is then reacted to regenerate free gaseous ammonia, which can then be recovered for subsequent use in the desulfurization of flue gases.Other References
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