Ultra high purity nitrogen and oxygen generator unit

Details Ultra high purity nitrogen and oxygen generator unit Ultra high purity nitrogen and oxygen generator unit

1996-11-04

1998-04-28

Capossela, Ronald C.

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62652, F25J 100

Patent

active

057431124

ABSTRACT:
A unit capable of simultaneously producing liquid nitrogen of ultra high purity and liquid oxygen of ultra high purity, is provided. The inside of a first rectification column 6 is demarcated to an upper rectifying part 12, a middle rectifying part 13 and a lower rectifying part 14. To the upper part 11 above the upper rectifying part 12 is connected a nitrogen condenser 8. A second rectification column 7 has a reboiler 24 provided under its rectifying part 22. Ultra high purity liquid nitrogen is recovered from between the upper rectifying part 12 and middle rectifying part 22 of the second rectification column 7, where it is brought in countercurrent contact with gas evaporated by the reboiler 24 provided below the rectifying part 22 so that lower boiling point components are separated therefrom. Thus, ultra high purity liquid oxygen is recovered from below the rectifying part 22 of the second rectification column 7.

REFERENCES:
patent: 4617037 (1986-10-01), Okada et al.
patent: 4848996 (1989-07-01), Thorogood et al.
patent: 5205127 (1993-04-01), Agrawal
patent: 5349822 (1994-09-01), Nagamura et al.

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