Air separation with argon recovery

Details Air separation with argon recovery Air separation with argon recovery

1990-02-22

1991-07-23

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 24, 62 38, F25J 304

Patent

active

050340433

ABSTRACT:
An air separation system is provided comprising a double rectification column associated with a raw argon column, the latter being operated at a pressure substantially lower than the low-pressure part of the double column. A coupled turbine-compressor system is used: (a) to lower the pressure of the argon-containing gas entering a raw argon column from the low-pressure column; and (b) to compress evaporated liquid stemming from the high-pressure column which has been used to indirectly condense raw argon product at the top of the raw argon column. Also, a pump is employed to remove liquid from the bottom of the raw argon column and recycle it to the low-pressure column.

REFERENCES:
patent: 3079759 (1963-03-01), Schilling
patent: 3127260 (1964-03-01), Smith
patent: 3729943 (1973-05-01), Petit
patent: 4057407 (1977-11-01), Bigi
patent: 4790866 (1988-12-01), Rathbone
patent: 4842625 (1989-06-01), Allam et al.

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