US 12,459,819 B2
Process and reactor for catalytic oxidation of ammonia
Iacopo Cerea, Lugano (CH); Ermanno Filippi, Castagnola (CH); Luca Redaelli, Drezzo (IT); and Pasquale Talarico, Viganello (CH)
Assigned to CASALE SA, Lugano (CH)
Appl. No. 17/642,760
Filed by CASALE SA, Lugano (CH)
PCT Filed Sep. 16, 2020, PCT No. PCT/EP2020/075895
§ 371(c)(1), (2) Date Mar. 14, 2022,
PCT Pub. No. WO2021/078444, PCT Pub. Date Apr. 29, 2021.
Claims priority of application No. 19205243 (EP), filed on Oct. 25, 2019.
Prior Publication US 2022/0332581 A1, Oct. 20, 2022
Int. Cl. B01J 8/02 (2006.01); B01J 12/00 (2006.01); B01J 19/00 (2006.01); B01J 23/46 (2006.01); B01J 35/58 (2024.01); C01B 21/22 (2006.01); C01B 21/40 (2006.01)
CPC C01B 21/22 (2013.01) [B01J 12/007 (2013.01); B01J 19/0013 (2013.01); B01J 23/464 (2013.01); B01J 35/58 (2024.01); C01B 21/40 (2013.01); B01J 2219/00092 (2013.01)] 7 Claims
 
1. A reactor adapted for catalytic oxidation of ammonia, the reactor comprising:
a catalyst layer, which is adapted to promote the oxidation of ammonia in a presence of oxygen;
a heat exchange apparatus that is situated in the reactor downstream the catalyst layer, and is suitable to cool a product gas effluent after passage over said catalyst layer, wherein said heat exchange apparatus has a tube side arranged to be traversed by boiling water and a shell side arranged to be traversed by process gas;
at least one bypass channel arranged to provide a bypass route which bypasses at least partially said heat exchange apparatus;
a mixing zone where the product gas effluent from said at least one bypass channel mixes with cooled process gas passed through the heat exchange apparatus to give a mixed gas;
valve means arranged to control a gas flow rate through said at least one bypass channel; and
a control system which is configured to control said valve means, and therefore the bypass flow rate in the at least one bypass channel, based on a target temperature of the mixed gas.