Ammonia production process and plant

Details Ammonia production process and plant Ammonia production process and plant

C - Chemistry, Metallurgy

01

C

23/217

C01C 1/04 (2006.01) C01B 3/02 (2006.01) C01B 3/38 (2006.01)

Patent

CA 1124032

1 B29762/ Abstract Ammonia production process and plant An ammonia production process comprises steam hydrocarbon primary reforming, air secondary reforming, carbon monoxide shift, carbon oxides removal, ammonia synthesis and discarding of non-reactive gases and is made more economical in energy consumption by using excess air in secondary reforming and treating the synthesis gas to separate a hydrogen-enriched stream and returning that stream to the synthesis. Preferably the synthesis gas after carbon oxides removal is compressed if at all by no more than 50% and consequently the process can be carried out in a plant having a gas circulator but no compressor. Preferably synthesis is at a pressure in the range 40-80 bar abs. and at an outlet temperature in the range 350-430°C over a catalyst containing iron, cobalt and promoting compounds. Recovery of the hydrogen-enriched stream is preferably from a side stream of synthesis gas.

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