Refrigeration – Cryogenic treatment of gas or gas mixture – Separation of gas mixture
Patent
1995-09-25
1996-12-10
Kilner, Christopher
Refrigeration
Cryogenic treatment of gas or gas mixture
Separation of gas mixture
62900, F25J 304
Patent
active
055820352
ABSTRACT:
Cooled and purified air is introduced into a higher pressure rectification column and separated into oxygen-enriched liquid and nitrogen vapor. A stream of the oxygen-enriched liquid is flashed through a pressure reducing valve to form a mixture of liquid further enriched in oxygen and vapor depleted of oxygen. The liquid is reboiled by reboiler. A stream of the further enriched liquid is reboiled in condenser and is introduced into a lower pressure rectification column for separation into oxygen and nitrogen products. Reflux for the columns and is formed by condensing in condenser nitrogen vapor separated in the higher pressure rectification column. A reboiler provides an upward flow of vapor through the column. The condenser and reboiler take the form of a single heat exchanger. The reboiler is located in a phase separator, the reboiler is located in a rectification column containing liquid-vapor contact devices above the level at which fluid issuing from the valve is introduced. Oxygen-depleted vapor is condensed in the condenser by heat exchange with the further enriched liquid and at least some of the resulting condensate introduced into the lower pressure rectification column.
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Lavin John T.
Rathbone Thomas
Stuart David
Cassett Larry R.
Kilner Christopher
Rosenblum David M.
The BOC Group plc
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