Method for converting urea to ammonia
Patent 5281403 Issued on January 25, 1994. Estimated Expiration Date: 
September 27, 2011. 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 27, 2011. 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 ReferencesUrea cyanurate manufacture Method of hydrolyzing urea contained in waste water streams Thermally stable coprecipitated catalysts useful for methanation and other reactions Catalytic method for hydrolyzing urea Catalytic method for hydrolyzing urea Patent #: 4220635 InventorAssigneeApplicationNo. 766853 filed on 09/27/1991US Classes:423/235, Nitrogen or nitrogenous component423/238, Utilizing liquid as reactant423/239.1Utilizing solid sorbent, catalyst, or reactantExaminersPrimary: Heller, Gregory A.Attorney, Agent or FirmForeign Patent References
International ClassesC01B 021/00B01J 008/00 C01C 003/00 AbstractA method is provided for reducing NOx in a combustion exhaust gas stream from a boiler. The method includes the steps of converting an aqueous solution of urea to ammonia by heating the urea solution to a temperature of 350°-650° F. in an injection lance system. The urea solution is pressurized to the pressure required to keep urea reaction products in the liquid phase and is contacted for a selected time with a conversion catalyst selected from the group of metals, metal oxides, or metal compounds consisting of chromium or molybdenum to provide a converted urea solution. The converted urea solution is injected from the injection lance system into the combustion exhaust gas for reducing NOx.Other References
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