Refrigeration – Processes – Circulating external gas
Patent
1988-09-27
1989-08-29
Capossela, Ronald C.
Refrigeration
Processes
Circulating external gas
55 66, 62 22, 62 24, 62 40, F25J 300
Patent
active
048613614
ABSTRACT:
Argon and nitrogen are separated from a gaseous stream containing them in combination with oxygen in a three-step process comprising introducing the gaseous stream under pressure to a noncryogenic separator to produce therein a stream enriched in nitrogen and argon, introducing said stream into a cryogenic distillation column to produce a high purity nitrogen product. An argon-rich side stream withdrawn from the cryogenic distillation column is introduced into a pressure swing adsorption unit to provide a crude argon product containing 97 percent or more of argon. The first noncryogenic separator may be a pressure swing adsorption unit or a gas diffusion zone.
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Andrecovich Mark J.
Jain Ravi
LaCava Alberto
Maclean Donald L.
Capossela Ronald C.
Cassett L. R.
Nemetz Carol A.
Swope R. Hain
The BOC Group Inc.
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