Method and cryogenic plant for producing gaseous oxygen

Details Method and cryogenic plant for producing gaseous oxygen Method and cryogenic plant for producing gaseous oxygen

F - Mech Eng,Light,Heat,Weapons

25

J

162/120

F25J 3/06 (2006.01)

Patent

CA 1129330

ABSTRACT A method of producing gaseous oxygen comprises the steps of fractionating dry compressed air in a distillation system (9) having a high pressure column (8) operating at between 4 and 8 bars guage and a low pressure column (15) operating at between 0.2 and 2 bars guage. Liquid oxygen is withdrawn from the bottom of the low pressure column (15) through line (40) is pressurized by static head and/or a pump (41) and is evaporated in vessel (43) against a stream (27) of substantially pure nitrogen which has been removed from the top of the high pressure column (8) and compressed to such a pressure that it is at least partly liquified by the evaporation of the oxygen. At least part of the liquified nitrogen formed in vessel (43) is expanded and is returned to the high pressure column (8) as reflux.

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