Air separation

Details Air separation Air separation

1997-04-02

1999-07-27

Bushey, C. Scott

Gas separation: processes

Compressing and indirect cooling of gaseous fluid mixture to...

62643, 62924, 95 42, F25J 304

Patent

active

059284080

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 A first oxygen product containing less than 3.5% by volume of argon impurity is withdrawn through an outlet of the column which has a packed section below the level of the outlet.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through the packed section and a second relatively pure oxygen product containing less than 100 volumes per million is withdrawn from below the section through an outlet thereof.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: 4615716 (1986-10-01), Cormier et al.
patent: 4977746 (1990-12-01), Grenier et al.
patent: 5100448 (1992-03-01), Lockett et al.
patent: 5425241 (1995-06-01), Agrawal et al.
patent: 5528906 (1996-06-01), Naumovitz et al.
patent: 5590543 (1997-01-01), Agrawal et al.

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