Air separation

Details Air separation Air separation

1997-11-11

1999-04-13

Capossela, Ronald

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62924, F25J 300

Patent

active

058932763

ABSTRACT:
Air is separated in a double rectification column comprising a higher pressure rectification column, a lower pressure rectification column, and a condenser-reboiler placing the column in indirect heat exchange relationship with the column. A stream of pressurized liquid, comprising oxygen and nitrogen, typically taken from the bottom of the higher pressure rectification column, is expanded through a valve and is typically partially vaporized in a vaporizer-condenser which is separate from a second vaporizer-condenser in which argon is condensed. The vaporized liquid is expanded with the performance of external work in an expansion turbine and is introduced into the lower pressure rectification column. An oxygen product is withdrawn from the column through an outlet.

REFERENCES:
patent: 4936099 (1990-06-01), Woodward et al.
patent: 5396772 (1995-03-01), McKeigue

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