Cryogenic air separation with cold argon recycle

Details Cryogenic air separation with cold argon recycle Cryogenic air separation with cold argon recycle

1983-08-12

1985-08-06

Sever, Frank

Refrigeration

Processes

Circulating external gas

62 30, 62 31, 62 34, 62 42, F25J 302

Patent

active

045333750

ABSTRACT:
The invention provides an efficient means of increasing oxygen purity and recovery and also argon recovery in cryogenic distillative air separation plants. In addition, the invention makes it possible to increase the oxygen delivery pressure from high efficiency triple pressure configurations without using an oxygen vacuum compressor. These advantages are obtained by incorporating an argon recycle compressor within the cold box, which compresses argon from an argon rectifier, causes it to condense against boiling liquid oxygen from the argon stripper, and uses the condensed argon to reflux the argon rectifier. Pressurized high purity oxygen can then be obtained using a LOX pump, plus a split supply pressure configuration in which an elevated pressure rectifier gasifies the LOX.

REFERENCES:
patent: 4345925 (1982-08-01), Cheung
patent: 4384876 (1983-05-01), Mori et al.

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