Process and an apparatus for recovering argon

Details Process and an apparatus for recovering argon Process and an apparatus for recovering argon

1994-05-27

1995-06-27

Kilner, Christopher B.

Refrigeration

Processes

Circulating external gas

62 24, 62 36, 62 42, F25J 304

Patent

active

054269466

ABSTRACT:
For extracting argon, air is separated in a rectifying system comprising at least one air separating column and one crude argon column. An argon-containing oxygen fraction is taken from the air separating column and is introduced into a crude argon column. In the upper area of the crude argon column, a crude argon fraction is removed and a first reflux liquid is charged. A first residual fraction is taken from the lower area of the crude argon column. The crude argon fraction is introduced into the lower area of a semipure column. In the upper area of the semipure column, an argon fraction is taken which has reduced oxygen, and a second reflux liquid is charged. From the lower area of the semipure column, a second residual fraction is taken which forms the first reflux liquid for the crude argon column.

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patent: 5237823 (1993-08-01), Cheung et al.
patent: 5282365 (1994-02-01), Victor et al.

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