Air separation

Details Air separation Air separation

1996-10-18

1997-12-02

Capossela, Ronald C.

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62654, 62913, F25J 300

Patent

active

056923961

ABSTRACT:
Compressed, purified, vaporous air and liquid air streams are introduced into a higher pressure rectification column. A stream of oxygen-enriched liquid flows from an outlet of the higher pressure rectification column via a reboiler and an expansion valve into a vessel. The oxygen-enriched liquid is partially vaporised in a boiler located in the vessel. The residual liquid flows from the vessel and a condenser to a lower pressure rectification column in which oxygen and nitrogen products are separated. A stream of vapour flows from the boiler through an outlet from the vessel to a pipeline which leads the air back for compression with incoming air. A greater yield of oxygen, and, if separated, argon is made possible by this recycle.

REFERENCES:
patent: 5084081 (1992-01-01), Rohde
patent: 5400600 (1995-03-01), Grenier
patent: 5408831 (1995-04-01), Guillard et al.

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