Method for converting urea to ammonia
February 7, 2016. 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 3900554 Urea 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 Urea reduction of NOx in combustion effluents Catalytic method for hydrolyzing urea Boiler and injector for reducing the concentration of pollutants in an effluent Combined catalytic/non-catalytic process for nitrogen oxides reduction Process for reducing nitrogen oxides without generating nitrous oxide InventorAssigneeApplicationNo. 598092 filed on 02/07/1996US Classes:423/239.1, Utilizing solid sorbent, catalyst, or reactant423/246, Carbon monoxide component423/358From organic material containing nitrogenExaminersPrimary: Langel, Wayne A.Attorney, Agent or FirmForeign Patent References
International ClassesC01B 021/00C01C 001/08 AbstractA method 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. The urea solution is pressurized to the pressure required to keep 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 comprising aluminum, chromium, cobalt, molybdenum, niobium, titanium, tungsten, and vanadium to provide a converted area solution. The converted area solution is injected into the combustion exhaust gas for reducing NOx.Other References
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