Hybrid membrane - cryogenic generation of argon concurrently wit

Details Hybrid membrane - cryogenic generation of argon concurrently wit Hybrid membrane - cryogenic generation of argon concurrently wit

1990-06-18

1991-09-17

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 22, 55 16, F25J 302

Patent

active

050491741

ABSTRACT:
The present invention involves an efficient process for separating selected components of a gas stream by integrating a cryogenic separation unit and a membrane separation unit. Two embodiments provide for the concurrent generation of an argon-rich stream in the gas or liquid phase, along with a nitrogen-rich product stream, both being produced from a stream normally comprising oxygen, nitrogen, and argon, e.g., air.
Broadly, the novel system uses a membrane means to preferentially reject the oxygen component from the recycle stream of the cryogenic unit, concurrently accumulating the argon component to allow its separation as an argon-enriched product stream.

REFERENCES:
patent: 4152130 (1979-05-01), Theobald
patent: 4230463 (1980-10-01), Henis et al.
patent: 4595405 (1986-06-01), Agrawal et al.
patent: 4817392 (1989-04-01), Agrawal et al.

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