Air separation

Details Air separation Air separation

1995-07-20

1996-12-10

Capossela, Ronald C.

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62653, 62654, 62924, F25J 300

Patent

active

055820310

ABSTRACT:
Air is compressed in a compressor, cooled in a main heat exchanger, partially condensed in a reboiler-condenser, introduced into a higher pressure rectifier, and separated therein into nitrogen and oxygen-enriched liquid. Resulting nitrogen is condensed in further reboiler-condensers. One part of the condensate is used as reflux in the higher pressure rectifier and another part as reflux in a lower pressure rectifier. A stream of oxygen-enriched liquid is withdrawn from the high pressure rectifier and sent to an intermediate pressure rectifier which is reboiled by one of the further reboiler-condensers and in which further nitrogen is separated. A stream of liquid further enriched in oxygen is withdrawn from the bottom of the intermediate pressure rectifier and is separated in the lower pressure rectifier and impure and pure oxygen products are withdrawn respectively therefrom. In addition an argon-enriched oxygen stream is withdrawn from the lower pressure rectifier through an outlet and separated in an argon rectifier. Further impure oxygen product is withdrawn from the bottom of the argon rectifier.

REFERENCES:
patent: 4533375 (1985-08-01), Erickson
patent: 4575388 (1986-03-01), Okada
patent: 5069699 (1991-12-01), Agrawal
patent: 5233838 (1993-08-01), Howard
patent: 5337570 (1994-08-01), Prosser
patent: 5361590 (1994-11-01), Rathbone

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