Air separation

Details Air separation Air separation

1997-09-18

1999-03-09

Doerrler, William

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62654, F25J 300

Patent

active

058785981

ABSTRACT:
Air is separated into oxygen and nitrogen in a double rectification column comprising a higher pressure rectification column and a lower pressure rectification column. Liquid nitrogen reflux for the separation is provided by condensing nitrogen vapor taken from the column in a condenser-reboiler. Additional separation is performed in an intermediate pressure rectification column. A first stream of argon-enriched vapor is withdrawn from an intermediate region of the lower pressure rectification column and has an argon fraction separated from it in a first side rectification column. A second stream of argon-enriched vapor is similarly withdrawn and is separated in a second side rectification column which provides vapor to heat a reboiler associated with the intermediate pressure rectification column. Alternatively a stream of oxygen vapor can be so employed instead of the second argon-enriched vapor stream.

REFERENCES:
patent: 4533375 (1985-08-01), Erickson
patent: 5657644 (1997-08-01), Oakey et al.
patent: 5689975 (1997-11-01), Oakey et al.
patent: 5692398 (1997-12-01), Higginbotham

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