Process to produce oxygen and argon using divided argon column

Details Process to produce oxygen and argon using divided argon column Process to produce oxygen and argon using divided argon column

1997-07-28

1998-06-23

Capossela, Ronald C.

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62924, F25J 304

Patent

active

057689148

ABSTRACT:
A process is set forth for the cryogenic distillation of an air feed to produce oxygen and argon and is particularly applicable where high purity oxygen and ultra-high purity argon are required and where only moderate argon recovery is required. A key to the present invention is that the argon column is divided into a lower section and an upper section and the impure argon overhead from the lower section is split into three portions. The first portion is further distilled to the desired purity in the top section, the second portion is condensed and returned as reflux to the lower section, and the third portion is removed as an impure argon stream. Such a scheme allows one to reduce the diameter of the argon column's top section, thereby providing a capital cost savings.

REFERENCES:
patent: 5019145 (1991-05-01), Rohde et al.
patent: 5049173 (1991-09-01), Cormier, Sr. et al.
patent: 5572874 (1996-11-01), Rathbone

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