Air separation

Details Air separation Air separation

1998-12-17

2000-11-07

Doerrler, William

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62653, F25J 300

Patent

active

061419893

ABSTRACT:
Air is separated in a double rectification column comprising a higher pressure rectification column, a lower pressure rectification column, and a first condenser-reboiler, of which the condensing passages communicate with an upper region of the higher pressure rectification column, and the reboiling passage communicate with a lower region of the lower pressure rectification column. A second condenser-reboiler is operated so as to reboil a liquid fraction obtained in the higher pressure rectification column. A stream of the air to be separated is partially or totally condensed by indirect heat exchange with a stream of nitrogen condensed in the first condenser-reboiler. At least part of the stream of condensed nitrogen is taken as product downstream of its heat exchange with the second stream of compressed air.

REFERENCES:
patent: 4594085 (1986-06-01), Cheung
patent: 4854954 (1989-08-01), Erickson
patent: 5074898 (1991-12-01), Cheung
patent: 5355682 (1994-10-01), Agrawal et al.
patent: 5379598 (1995-01-01), Mostello

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