Air separation

Details Air separation Air separation

1995-12-13

1997-03-11

Capossela, Ronald C.

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62654, F25J 300

Patent

active

056090412

ABSTRACT:
A first flow of air is compressed in a first air compressor associated with a gas turbine and is purified in an adsorptive purification unit which separates water vapour and carbon dioxide from the air. The purified first flow of air is further compressed to a pressure at least 5 bar higher than that at which it is purified in a second air compressor whose outlet pressure is independent of fluctuations in the power output of the gas turbine, is cooled in a main heat exchanger, is passed through an expansion valve, and is introduced into a higher pressure rectification column. A second flow of air is compressed in a third air compressor which is independent of the gas turbine. The compressed second flow of air is purified in an adsorptive purification unit by the separation of water vapour and carbon dioxide therefrom. The purified second flow of air is cooled in the main heat exchanger and is introduced into the higher pressure rectification column. The air flows are rectified in the higher pressure rectification column and an associated lower pressure rectification column operating at pressures above 2 bar. A nitrogen product is withdrawn from the top of the lower pressure rectification column and a liquid oxygen product from the bottom thereof. The liquid oxygen is revised in pressure to at least 25 bar by a pump and is warmed to ambient temperature in the main heat exchanger.

REFERENCES:
patent: 5379598 (1995-01-01), Mostello
patent: 5402646 (1995-04-01), Rathbone
patent: 5440884 (1995-08-01), Bonaquist et al.
patent: 5454227 (1995-10-01), Straub et al.
patent: 5467602 (1995-11-01), Paolino et al.

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