Argon and nitrogen coproduction process

Refrigeration – Processes – Circulating external gas

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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 An argon-rich side stream withdrawn from the cryogenic distillation column is introduced into a pressure swing adsorption unit to provide a crude argon product containing 97 percent or more of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.

REFERENCES:
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patent: 3412567 (1968-11-01), Smith
patent: 3866428 (1975-02-01), Simonet et al.
patent: 3967464 (1976-07-01), Cormier et al.
patent: 4687498 (1987-08-01), MacLean et al.
patent: 4689062 (1987-08-01), MacLean et al.

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