Process to ultrapurify liquid nitrogen imported as back-up for n

Details Process to ultrapurify liquid nitrogen imported as back-up for n Process to ultrapurify liquid nitrogen imported as back-up for n

1989-07-05

1991-10-22

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 40, F25J 300

Patent

active

050583875

ABSTRACT:
An improved nitrogen generator having a distillation column for separating oxygen and nitrogen, the column having a top and a bottom and a rising vapor stream and a descending liquid stream in countercurrent contact with each other, the improvement comprising means for introducing an amount of liquid nitrogen into the column at an intermediate point in the column wherein the liquid stream composition at said point is substantially equivalent to the liquid nitrogen composition and a means for withdrawing a substantially equivalent amount of purified liquid nitrogen from the top of the column.

REFERENCES:
patent: 2951346 (1960-09-01), Collins et al.
patent: 3485053 (1969-12-01), Grenier
patent: 3620032 (1971-11-01), Simonet
patent: 4529425 (1985-07-01), McNeil
patent: 4668260 (1987-05-01), Yoshino
patent: 4671813 (1987-06-01), Yoshino
patent: 4698079 (1987-10-01), Yoshino
patent: 4780118 (1988-10-01), Cheung

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