Refrigeration – Processes – Circulating external gas
Patent
1990-03-09
1991-04-09
Capossela, Ronald C.
Refrigeration
Processes
Circulating external gas
62 38, 62 42, F25J 302
Patent
active
050061399
ABSTRACT:
The present invention is a cryogenic process for the production of nitrogen by distilling air in a double column distillation system comprising a high pressure column and a low pressure column. The critical step of the invention is the condensation of two nitrogen streams at different pressures in two reboiler/condensers located in the stripping section of the low pressure column to provide column reboil. The lower pressure of the two nitrogen streams is condensed in the upper of the two reboiler/condensers; the higher pressure nitrogen stream in the lower of the two reboiler/condensers.
REFERENCES:
patent: 4400188 (1983-08-01), Patel et al.
patent: 4705548 (1987-11-01), Agrawal et al.
patent: 4916908 (1990-08-01), Lavin et al.
Agrawal Rakesh
Woodward Donald W.
Air Products and Chemicals Inc.
Capossela Ronald C.
Jones II Willard
Marsh William F.
Simmons James C.
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