Refrigeration – Cryogenic treatment of gas or gas mixture – Separation of gas mixture
Patent
1996-01-03
1997-07-08
Kilner, Christopher
Refrigeration
Cryogenic treatment of gas or gas mixture
Separation of gas mixture
62900, 62902, F25J 304
Patent
active
056449330
ABSTRACT:
A stream of compressed air is purified in a unit by removal of carbon dioxide and water vapour. The air is cooled by passage through a heat exchanger to a temperature suitable for its rectification. The air is separated in a higher pressure rectifier into oxygen-enriched liquid and nitrogen vapour. A stream of the oxygen-enriched liquid is reduced in pressure and introduced into a phase separator provided with a reboiler with the result that further separation takes place and a liquid further enriched in oxygen and an intermediate vapour are formed. A stream of the further-enriched liquid is separated into oxygen and nitrogen in a lower pressure rectifier. A stream of the intermediate vapour is condensed in a condenser and is introduced into the lower pressure rectifier. A part of the liquid nitrogen reflux for the higher and lower pressure rectifiers is formed by condensing nitrogen vapour separated in the higher pressure rectifier by indirect heat exchange with liquid from an intermediate mass transfer region the rectifier. Another part of the liquid nitrogen reflux is formed by vaporising impure oxygen product of the lower pressure rectifier in a condenser-reboiler by indirect heat exchange with nitrogen vapour taken from the lower pressure rectifier.
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Kilner Christopher
Pace Salvatore P.
Rosenblum David M.
The BOC Group plc
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