Air separation

Details Air separation Air separation

1987-08-25

1988-05-31

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

55 66, 62 24, F25J 304

Patent

active

047478608

ABSTRACT:
In a process for the separation of argon from air by distillation in a plurality of distillation columns, liquid oxygen and gaseous nitrogen, withdrawn from a distillation column, are introduced into opposing ends of a mixing zone and there are created opposing flows of liquid and vapor that become progressively richer in nitrogen and oxygen, in the direction of flow. A mixed stream containing both oxygen and nitrogen is withdrawn as waste or product from an intermediate point in the mixing zone. The mixing zone also provides for condensation and reintroduction of oxygen-rich vapor and return of liquid nitrogen to the distillation column. The distillation column further provides an intermediate condenser which provides intermediate reboil for the distillation column.

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patent: 3222878 (1965-12-01), Becker
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patent: 3688513 (1972-09-01), Streich et al.
patent: 4533375 (1985-08-01), Erickson
patent: 4575388 (1986-03-01), Okada
patent: 4578095 (1986-03-01), Erickson
patent: 4604116 (1986-08-01), Erickson
patent: 4605427 (1986-08-01), Erickson
patent: 4615716 (1986-10-01), Cormier et al.

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