Oxygen and argon by back-pressured distillation

Details Oxygen and argon by back-pressured distillation Oxygen and argon by back-pressured distillation

1986-02-20

1988-07-12

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 28, 62 32, 62 39, 62 42, F25J 304

Patent

active

047567317

ABSTRACT:
In a triple pressure cryogenic air distillation apparatus for producing of high purity oxygen and crude argon at low energy requirement, a novel method of avoiding proximity to argon freezeup conditions is disclosed. Referring to FIG. 3, the temperature at the overhead of the argon recovery column 309 is kept above about -305.degree. F. by increasing the pressure of N.sub.2 rejection column 304 to about 3 psi above normal discharge pressure. The exhaust N.sub.2 is subsequently depressurized in one or more work-expanders 324 and 330 thereby producing process refrigeration.

REFERENCES:
patent: 2699046 (1955-01-01), Etienne
patent: 2934907 (1960-05-01), Soofield
patent: 2934908 (1960-05-01), Latimer
patent: 3500651 (1970-03-01), Becker
patent: 3688513 (1972-09-01), Stretch
patent: 4254629 (1981-03-01), Olszewski
patent: 4433989 (1984-02-01), Erickson
patent: 4507134 (1985-03-01), Tomisaka

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