Production of argon from a cryogenic air separation process

Details Production of argon from a cryogenic air separation process Production of argon from a cryogenic air separation process

1998-06-10

1999-10-26

Doerrler, William

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62924, F25J 304

Patent

active

059707437

ABSTRACT:
The present invention relates to a process for the cryogenic separation of air to recover at least a nitrogen-depleted crude argon product, wherein the process is carried out in a primary distillation system comprising at least a first distillation column, which separates a feed mixture comprising nitrogen, oxygen and argon into a nitrogen-enriched overhead and an oxygen-rich bottoms, and a side-arm column which rectifies an argon-containing feed stream fed from the primary distillation column to produce an essentially-oxygen-depleted argon overhead. The improvement of the present invention is characterized in that: (a) a nitrogen-containing, argon-rich side stream is withdrawn from a location of the side-arm column which is above the location of entry of the argon-containing feed stream; (b) the withdrawn, nitrogen-containing, argon-rich side stream of step (a) is fed to a nitrogen rejection column to remove the contained nitrogen, wherein the nitrogen rejection column contains at least a stripping section which is located below the location of the feed of the nitrogen-lean, argon-rich side stream, and wherein the stripping section of the nitrogen rejection column is provided with vapor boilup; (c) the nitrogen-depleted, crude argon product is recovered and removed from the bottom of the nitrogen rejection column; and (d) at least a portion of upward flowing vapor in the nitrogen rejection column is removed and the removed portion is returned to a suitable location of the side-arm column.

REFERENCES:
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patent: 5592832 (1997-01-01), Herron er al.
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patent: 5692398 (1997-12-01), Higginbotham
patent: 5784899 (1998-07-01), Nojima et al.
patent: 5809802 (1998-09-01), Rathbone

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