Air separation in a double rectification column

Details Air separation in a double rectification column Air separation in a double rectification column

1998-05-29

1999-03-30

Kilner, Christopher B.

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62648, 62646, F25J 304

Patent

active

058874470

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 higher pressure rectification column in heat exchange relationship with the lower pressure rectification column. At least one stream of air is introduced into the double rectification column, a stream of pressurized liquid comprising oxygen and nitrogen is reduced in pressure by passage through a valve and is partially or totally vaporized in a vaporizer-condenser, a stream of resulting vapor from the partial or total vaporization is compressed in a compressor at cryogenic temperature and is introduced into the double rectification column, and an oxygen produce is withdrawn from the lower pressure rectification column through an outlet.

REFERENCES:
patent: 3173778 (1965-03-01), Gaumer, Jr.
patent: 4057972 (1977-11-01), Sarsten
patent: 4072023 (1978-02-01), Springmann
patent: 5412953 (1995-05-01), Darredeau et al.
patent: 5582032 (1996-12-01), Shelton et al.
patent: 5806341 (1998-09-01), Rathbone

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