Air separation process utilizing refrigeration extracted...

Details Air separation process utilizing refrigeration extracted... Air separation process utilizing refrigeration extracted...

2006-04-19

2009-06-30

Doerrler, William C (Department: 3744)

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

C062S050200, C062S646000

Reexamination Certificate

active

07552599

ABSTRACT:
A cryogenic air separation process is set forth wherein, in order to provide the refrigeration necessary when at least a portion of the oxygen product is desired as liquid oxygen, LNG-derived refrigeration is used to liquefy a nitrogen stream in the process. A key to the present invention is that, instead of feeding the liquefied nitrogen to the distillation column, the liquefied nitrogen is heat exchanged against the air feed to the distillation column system.

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