Cryogenic rectification process for producing ultra high purity

Details Cryogenic rectification process for producing ultra high purity Cryogenic rectification process for producing ultra high purity

1989-03-16

1990-02-20

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 34, F25J 302

Patent

active

049023217

ABSTRACT:
A process for producing ultra high purity nitrogen from nitrogen produced by the cryogenic rectification of air wherein superatomospheric nitrogen is progressively condensed and revaporized to effect rejection of lower boiling impurities without need for additional energy beyond that contained in the nitrogen input.

REFERENCES:
patent: 3210947 (1965-10-01), Dubs et al.
patent: 4416677 (1983-11-01), Pahade
patent: 4526595 (1985-07-01), McNeil
patent: 4566887 (1986-01-01), Openshaw
patent: 4594085 (1986-06-01), Cheung
patent: 4617037 (1986-10-01), Okada et al.
patent: 4617040 (1986-10-01), Yoshino
patent: 4755202 (1988-07-01), Cheung

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