F - Mech Eng,Light,Heat,Weapons – 25 – J
Patent
F - Mech Eng,Light,Heat,Weapons
25
J
162/128
F25J 3/04 (2006.01)
Patent
CA 2040796
A compressed air stream is separated in a double rectification column 8 having a higher pressure stage 10 and a lower pressure stage 12. The lower pressure stage 12 contains a low pressure drop liquid-vapour contact means 13 having a pressure drop of less than 400 Pa per theoretical stage, for example a structured packing, to effect mass transfer between ascending vapour and descending liquid. A product gaseous oxygen stream is withdrawn from the stage 12 through an outlet 36 and is warmed to about ambient temperature in the heat exchanger 6 in countercurrent flow relationship with the compressed air stream which is thereby cooled. Refrigeration for the process is created by expansion of part of the incoming air. By using a low pressure drop liquid-vapour contact means 13 in the lower pressure stage 12, the resulting operating pressure in the higher pressure stage is able to be lower than in a conventional process enabling the incoming air to be compressed to a lower pressure (for example a pressure in the range 5 to 6 bar). At such pressures, two expansion turbines 54 and 56 are used to enable the heat exchanger 6 to be operated efficiently.
Gowling Lafleur Henderson Llp
The Boc Group Plc
LandOfFree
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