Chemistry: physical processes – Physical processes – Crystallization
Patent
1974-10-11
1977-01-18
Scovronek, Joseph
Chemistry: physical processes
Physical processes
Crystallization
23288B, 23288C, 23288G, 423239, B01J 812, B01J 2394, F01N 315
Patent
active
040037118
ABSTRACT:
Nitrogen oxides (NOx) are removed from combustion waste gases by injecting gas (NH.sub.3) into the combustion waste gases in the presence of a metallic catalyst to deoxidize the nitrogen oxides to nitrogen and water, within a reaction tower having the catalysts moving through the reaction tower, so that thereafter the dust may be separated from the catalysts and the catalysts may be regenerated continuously, so that the regenerated catalysts may be returned to the reaction tower. The catalyst moves in a substantially closed path, and preferable downwardly through the reaction tower, with the ammonia gas and combustion waste gases moving in cross current through the reaction tower, with mixing being enhanced by a plurality of angled baffle plates. Regeneration is accomplished by washing the catalysts, particularly ferrous catalysts with water to remove ferric sulfates, thereafter providing ferrous sulfates on the surface of the ferrous catalysts, and thereafter heating the catalysts with combustion gases separate from the ammonia gases, to dry the catalysts prior to their moving into the portion of the reaction tower having therein the mixed ammonia gas and combustion waste gases.
REFERENCES:
patent: 2330174 (1943-09-01), Hachmuth
patent: 2493218 (1950-01-01), Bergstrom
patent: 2913404 (1959-11-01), Lieffers et al.
patent: 2924504 (1960-02-01), Reitmeier
patent: 2973326 (1961-02-01), Hodgins et al.
patent: 3032387 (1962-05-01), Anderson et al.
patent: 3497328 (1970-02-01), Calvert
patent: 3512925 (1970-05-01), Buechler et al.
Akimoto Hidetoshi
Hishinuma Yukio
Nakajima Fumito
Tamura Zensuke
Hitachi , Ltd.
Scovronek Joseph
Turk Arnold
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