Air separation

Details Air separation Air separation

1997-09-19

1999-02-09

Capossela, Ronald

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62903, 62924, F25J 300

Patent

active

058680071

ABSTRACT:
Air is separated in an arrangement of rectification columns including a double rectification column for separating oxygen and nitrogen from the air. The double rectification column comprises a higher pressure rectification column and a lower pressure rectification column. There is in addition a side rectification column for separating argon from a stream of argon-enriched oxygen/vapour withdrawn from the lower pressure rectification column. An intermediate pressure rectification column is employed to separate further nitrogen (oxygen-depleted vapour) from the air. An upward flow of vapour through the intermediate pressure rectification column is created by operation of a reboiler to boil liquid in the bottom of the column. In addition a flow of vaporised air is introduced into an intermediate mass transfer region of the column. For example, a stream of liquid air is withdrawn from an intermediate region of the higher pressure rectification column, is vaporised in a condenser and is introduced into the column through an inlet.

REFERENCES:
patent: 5341647 (1994-08-01), Koeberle et al.
patent: 5428962 (1995-07-01), Rieth
patent: 5471842 (1995-12-01), Mostello et al.

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