B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
162/104
B01D 53/04 (2006.01) C01B 23/00 (2006.01) C01C 1/04 (2006.01) F25J 3/02 (2006.01)
Patent
CA 1273865
ABSTRACT An improved process is disclosed for argon recovery from an ammonia synthesis plant purge gas comprising hydrogen, nitrogen, argon, ammonia, and methane. In one embodiment of the present invention, this purge gas is subjected to the following steps: (i) Separation of ammonia at high pressure by adsorption using zeolite molecular sieve material, which is subsequently regenerated by hot purge combined with pressure reduction; (ii) Separation of methane and most of the nitrogen by pressure swing adsorption using a molecular sieve or an activated carbon material having greater selectivity for methane than argon; (iii) Separation of hydrogen for recycle to the ammonia synthesis plant using a high pressure cryogenic distillation column or a membrane separator; and (iv) Separation of the nitrogen by cryogenic distillation means to obtain essentially pure liquid argon product.
529764
Krishnamurthy Ramachandran
Lerner Steven L.
Maclean Donald Lewis
Gowling Lafleur Henderson Llp
The Boc Group Inc.
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