Cryogenic process for producing ultra high purity nitrogen

Details Cryogenic process for producing ultra high purity nitrogen Cryogenic process for producing ultra high purity nitrogen

1991-08-27

1993-04-27

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 44, F25J 302

Patent

active

052051277

ABSTRACT:
This invention relates to a cryogenic process for the separation of air utilizing an integrated multi-column distillation system wherein an ultra high purity nitrogen product is generated. In the cryogenic distillation separation of air, air is initially compressed, pretreated and cooled for separation into its components. Ultra high purity, e.g., nitrogen having less than 0.1 ppm of light impurities is generated with enhanced nitrogen product recovery by withdrawing liquid nitrogen from a first column at an intermediate point and charging that fraction as feed to the second column, withdrawing a nitrogen stream which is rich in volatile contaminants from the top of the first column, partially condensing that nitrogen stream against crude liquid oxygen, and removing the uncondensed portion which has been concentrated in volatile contaminants as a purge stream. An ultra high purity nitrogen product is obtained from a second column.

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patent: 4783210 (1988-11-01), Ayres et al.
patent: 4822395 (1989-04-01), Cheung
patent: 4824453 (1989-04-01), Rottman et al.
patent: 4902321 (1990-02-01), Cheung
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