Nitrogen production by low energy distillation

Details Nitrogen production by low energy distillation Nitrogen production by low energy distillation

1984-09-26

1986-04-15

Sever, Frank

Refrigeration

Processes

Circulating external gas

62 28, 62 29, 62 31, 62 34, 62 39, F25J 304

Patent

active

045825181

ABSTRACT:
The invention provides a means of producing high purity nitrogen at high recovery with lower energy requirement than has been possible heretofore. This is done with an elevated pressure dual pressure distillation column arrangement wherein the low pressure column (at about 4 ATA pressure) (component 102 in FIG. 1) is reboiled by partially condensing supply air in 103 and is refluxed both by direct injection of LN.sub.2 from the HP rectifier 105 plus latent heat exchange with depressurized LP column bottom liquid in 114, and the HP rectifier is refluxed by latent heat exchange with either LP column intermediate liquid in 106 and/or depressurized kettle liquid.

REFERENCES:
patent: 4439220 (1984-03-01), Olszewski et al.
patent: 4448595 (1984-05-01), Cheung

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