Refrigeration – Cryogenic treatment of gas or gas mixture – Separation of gas mixture
Patent
1996-10-18
1997-12-02
Capossel, Ronald C.
Refrigeration
Cryogenic treatment of gas or gas mixture
Separation of gas mixture
62654, F25J 300
Patent
active
056923970
ABSTRACT:
Air is separated in a higher pressure rectification column into a bottom fraction of oxygen-enriched liquid air and a top fraction of nitrogen. The column has a first inlet for a first vaporous air stream at a first pressure communicating with an expansion turbine. A first condenser-reboiler for condensing a second vaporous air stream at a second pressure greater than the first pressure has an inlet communicating with a compressor. The condensate flows through an expansion valve into the higher pressure rectification column. A stream of oxygen-enriched liquid is withdrawn from the bottom of the column and is introduced into a lower pressure rectification column in which an impure oxygen fraction is separated. A second condenser-reboiler places the top of the higher pressure rectification column in heat exchange relationship with an intermediate region of the column. Reboil for the bottom of the column is provided by the first condenser-reboiler. An impure oxygen product is withdrawn from the column. Less power is consumed than in comparable known processes.
REFERENCES:
patent: 5209070 (1993-05-01), Darrendeau
patent: 5263327 (1993-11-01), Drnevich et al.
patent: 5400600 (1995-03-01), Grenier
patent: 5438835 (1995-08-01), Rathbone
Capossel Ronald C.
Pace Salvatore P.
Rosenblum David M.
The BOC Group plc
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