Refrigeration – Cryogenic treatment of gas or gas mixture – Separation of gas mixture
Patent
1997-04-29
1998-06-09
Kilner, Christopher
Refrigeration
Cryogenic treatment of gas or gas mixture
Separation of gas mixture
F25J 304
Patent
active
057619271
ABSTRACT:
A process is set forth for the cryogenic distillation of an air feed to produce nitrogen, particularly high pressure nitrogen of ultra high purity (less than 100 parts per billion of oxygen). A key to the present invention is that, in addition to the conventional reboiler/condenser which links the high and low pressure column, the present invention utilizes two additional reboiler/condensers such that the oxygen rich liquid which collects at the bottom of the low pressure column is reboiled at three different pressure levels.
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Agrawal Rakesh
Latshaw Catherine Catino
Air Products and Chemicals Inc.
Kilner Christopher
Wolff Robet J.
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