Air separation

Details Air separation Air separation

1994-12-13

1996-01-23

Kilner, Christopher

Refrigeration

Processes

Circulating external gas

62 31, 62 38, F25J 302

Patent

active

054857295

ABSTRACT:
Nitrogen is separated from a first stream of compressed air in a higher pressure rectification column and from a second stream of compressed air in an intermediate pressure rectification column. Oxygen-enriched liquid is taken from the columns and separated in a lower pressure rectification column. An impure oxygen product is withdrawn in liquid state from the lower pressure column through an outlet. A part of the first air stream is condensed in a first condenser-reboiler, and a part of the second air stream is condensed in a third condenser-reboiler. Nitrogen separated in the higher pressure rectification column is condensed in a second condenser-reboiler, and nitrogen separated in the intermediate pressure rectification column is condensed in a fourth condenser-reboiler. The resulting nitrogen condensate is used as reflux in the columns. The condenser-reboilers provide reboil for the lower pressure rectification column.

REFERENCES:
patent: 4604116 (1986-08-01), Erickson
patent: 4605427 (1986-08-01), Erickson
patent: 4936099 (1990-06-01), Woodward et al.
patent: 5069699 (1991-12-01), Agrawal
patent: 5231837 (1993-08-01), Ha
patent: 5233838 (1993-08-01), Howard
patent: 5331818 (1994-07-01), Rathbone
patent: 5337570 (1994-08-01), Prosser
patent: 5341646 (1994-08-01), Agrawal et al.
patent: 5361590 (1994-11-01), Rathbone

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