Cryogenic triple-pressure air separation with lp-to- mp...

Details Cryogenic triple-pressure air separation with lp-to- mp... Cryogenic triple-pressure air separation with lp-to- mp...

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25

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162/104, 162/120

F25J 3/02 (2006.01) F25J 3/04 (2006.01)

Patent

CA 1224136

Abstract This invention makes possible a substantial im- provement in the distillation column efficiencies of a cryogenic air separation process while still retain- ing high reboil rates through the argon stripping section of the low pressure column. Those advantages result in a lower energy requirement for separating air while still yielding medium to high oxygen purity. In a triple pressure column arrangement, the medium pressure column efficiency is increased by reboiling it at two or more locations by latent heat exchange with both the high pressure and low pressure columns. The LP column vapor which reboils the MP column is taken from above at least part of the argon stripper, to maintain a high reboil rate through the stripper.

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