Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1977-11-21
1979-02-27
Peters, G. O.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
252411S, 423244, B01D 5334, B01J 2392
Patent
active
041419596
ABSTRACT:
Ammonia is added to combustion flue gas containing nitrogen and sulfur oxides and the gas is brought into contact with a catalyst which contains titanium or tin oxide, or a mixture of the two, as a main component at a temperature between 150 .about. 330.degree. C.
Nitrogen oxides are reduced to nitrogen and water, and sulfur oxides are deposited as ammonium sulfates, on the surface of the catalyst which causes a decrease in the ability of the catalyst.
A part of the catalyst is removed continuously or intermittently from a catalyst bed and fed to a regeneration tower where it is treated with a hot gas having a temperature of 350 .about. 600.degree. C. The ammonium sulfates deposited on the catalyst are decomposed into SO.sub.3 and NH.sub.3. The SO.sub.3 is adsorbed by an SO.sub.3 absorbent and the NH.sub.3 is returned to the combustion flue gas to be treated.
REFERENCES:
patent: 4003711 (1977-01-01), Hishinuma et al.
patent: 4043939 (1977-08-01), Kasaoka
patent: 4044102 (1977-08-01), Muraki et al.
patent: 4070305 (1978-01-01), Obayashi et al.
Kagabu Hiroshi
Kato Akira
Matsuda Shinpei
Nakajima Fumito
Sakuta Youichi
Beall, Jr. Thomas E.
Hitachi, Ltd. and Babcock-Hitachi Kabushiki Kaisha
Peters G. O.
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