Method for converting urea to ammonia

Details Method for converting urea to ammonia Method for converting urea to ammonia

1991-09-27

1994-01-25

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

423238, 423239, C01B 2100, B01J 800, C01C 300

Patent

active

052814033

ABSTRACT:
A 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.degree.-650.degree. 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.

REFERENCES:
patent: 4018769 (1977-04-01), Young
patent: 4087513 (1978-05-01), Schell
patent: 4124629 (1978-11-01), Hansford
patent: 4168299 (1979-09-01), Schnell
patent: 4220635 (1980-09-01), Schnell
Article titled Urea, Its Properties and Manufacture, by George Tsei-Yu Chao, 1967.

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