Air separation

Details Air separation Air separation

1999-03-25

2000-07-18

Doerrler, William

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62643, F25J 304

Patent

active

06089041&

ABSTRACT:
Air is separated in a double rectification column including a lower pressure rectification column. A first oxygen product containing less than 3.5% by volume of argon impurity is withdrawn through an outlet of the column which has a packed section below the level of the outlet. The argon impurity is striped from liquid descending through the packed section and a second relatively pure oxygen product containing less than 100 volumes per million is withdrawn from below the section through an outlet thereof. Impurities less volatile than oxygen are preferably separated from the second oxygen product in a side rectification column.

REFERENCES:
patent: 4560397 (1985-12-01), Cheung
patent: 4822395 (1989-04-01), Cheung
patent: 4838913 (1989-06-01), Victor et al.
patent: 5049173 (1991-09-01), Cormier et al.
patent: 5209070 (1993-05-01), Darredeau
patent: 5469710 (1995-11-01), Howard et al.
patent: 5582033 (1996-12-01), Bonaquist et al.
patent: 5743112 (1998-04-01), Yamamoto et al.

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