Cryogenic process for the separation of air to produce ultra hig

Details Cryogenic process for the separation of air to produce ultra hig Cryogenic process for the separation of air to produce ultra hig

1991-01-03

1992-06-23

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 38, 62 42, F25J 302

Patent

active

051239477

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 typically having less than 0.1 ppm impurities is generated in a multi-column distillation system comprising a first column and an ultra high purity nitrogen column with enhanced nitrogen product recovery by withdrawing a gaseous nitrogen fraction from a first column and charging the fraction as a feed to the ultra high purity nitrogen column, withdrawing a nitrogen stream which is rich in volatile contaminants from the top of the ultra high purity nitrogen column and recovering a nitrogen product at a point below the removal point of the nitrogen rich stream containing volatile components. Removal of volatile components in the distillation process is effected by partially condensing a nitrogen vapor stream from either the first column or the ultra high purity column and removing at least one of the uncondensed portions of the nitrogen rich stream containing volatile components as a purge stream.

REFERENCES:
patent: 4303428 (1981-12-01), Vandenbussche
patent: 4705548 (1987-11-01), Agrawal et al.
patent: 4783210 (1988-11-01), Ayres et al.
patent: 4824453 (1989-04-01), Rottman et al.
patent: 4902321 (1990-02-01), Cheung
patent: 4957523 (1990-09-01), Zarate et al.

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