Cryogenic production of ammonia synthesis gas

Details Cryogenic production of ammonia synthesis gas Cryogenic production of ammonia synthesis gas

F - Mech Eng,Light,Heat,Weapons

25

J

162/110

F25J 3/02 (2006.01) C01B 3/02 (2006.01) F25J 3/06 (2006.01)

Patent

CA 1223518

ABSTRACT OF THE DISCLOSURE An improved cryogenic separation process is pro- vided for forming a substantially CO-free and lower hydro- carbon-free hydrogen-rich gas 13, suitable for use in producing an ammonia synthesis gas 14, from a hydrogen- containing gas stream 10 also containing carbon monoxide and lower hydrocarbon impurities, wherein the hydrogen containing gas 10 is subject to a two-stage autorefriger- ated cryogenic flash treatment (60 and 80) to remove con- centrated methane-containing and carbon monoxide-containing streams (11 and 12), and the thus-purified hydrogen gas 18 is passed to a nitrogen wash tower 100 in counter-current contact with liquid nitrogen 109 to form the desired hydro- gen-rich product stream as an overheads 102 from the wash tower 100.

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