Air separation

Details Air separation Air separation

F - Mech Eng,Light,Heat,Weapons

25

J

162/104

F25J 3/04 (2006.01)

Patent

CA 1296992

ABSTRACT AIR SEPARATION Air is fractionated in a double distillation column comprising lower pressure and higher pressure columns. A condenser/reboiler provides reboiled oxygen to the bottom of the column. Liquid nitrogen reflux is introduced into the top of the column. Oxygen, nitrogen and argon-en- riched streams are withdrawn from the column. The argon- enriched stream is separated in a further distillation column and a product argon stream is withdrawn therefrom. A liquid stream comprising oxygen and nitrogen is with- drawn from an intermediate level of the column, is at least partially reboiled in a heat exchanger, and is returned to the column at a level where the composition of the vapor corresponds approximately to that of the re- boiled liquid. Heating for the heat exchanger is provided by a fluid stream withdrawn from the second distillation column. The fluid stream is returned to the second col- umn. The reboiling of the stream from the intermediate level of the first distillation column enhances the efficiency of the air separation.

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