Cryogenic air distillation with companded nitrogen refrigeration

Details Cryogenic air distillation with companded nitrogen refrigeration Cryogenic air distillation with companded nitrogen refrigeration

1986-07-02

1988-11-08

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 39, F25J 304

Patent

active

047832096

ABSTRACT:
Method and apparatus are disclosed for obtaining more refrigeration from a cold pressurized stream of nitrogen being expanded to discharge pressure, particularly in an air separation plant. Referring to FIG. 1, cold expansion in 1 is followed or preceded by warm compression in 2 of at least part of the same stream being expanded. The net result of reduced N.sub.2 to expansion is more LN.sub.2 reflux available to increase O.sub.2 recovery, without import of additional power or substantial increase in capital cost.

REFERENCES:
patent: 2666303 (1954-01-01), Schuftan
patent: 3677019 (1972-07-01), Olszewski
patent: 3696637 (1972-10-01), Ness et al.
patent: 4274850 (1981-06-01), Becker
patent: 4388108 (1982-07-01), Isalski et al.
patent: 4451275 (1984-05-01), Vines et al.
patent: 4533375 (1985-08-01), Erickson
patent: 4563203 (1986-01-01), Weiss et al.

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