Refrigeration – Processes – Circulating external gas
Patent
1985-10-31
1986-10-14
Capossela, Ronald C.
Refrigeration
Processes
Circulating external gas
62 32, 62 38, 62 42, 62434, F25J 300
Patent
active
046170375
ABSTRACT:
A nitrogen production method wherein air is compressed, is removed of water and carbon dioxide contained therein, and is simultaneously cooled to a temperature close to the liquefying point, and the resultant cleaned and cooled air is fed into a rectifying column for rectification so that high purity nitrogen is withdrawn from the rectifying column overhead; and wherein the oxygen-enriched liquid air withdrawn from the rectifying column bottom is expanded and fed into a condensation step wherein it becomes a source of reflux producing cold in the above-mentioned rectifying column, and then a cold is produced by adiabatically expanding the vaporized gas, after which heat exchange with raw air is performed. In this method, there is provided a closed circulating system wherein a circulating gas which is compressed is cooled by heat exchange with a return gas of the circulating gas, and the resultant cooled gas is fed into a reboiler at the bottom of the above-mentioned rectifying column wherein it vaporizes a liquid in the bottom of the rectifying column, and after the compressed circulating gas itself is liquefied through the above described step and expanded, it is fed into the above-mentioned condenser wherein it is vaporized by heat exchange with the high purify nitrogen from the above-mentioned rectifying column, and further the resultant vaporized gas is restored to normal temperature by heat exchange with the above-mentioned compressed circulating gas and is then subjected to recompression for continued circulation.
REFERENCES:
patent: 3126267 (1964-03-01), Vander Arend
patent: 3818714 (1974-06-01), Etzbach et al.
patent: 3914949 (1975-10-01), Matter et al.
patent: 4088464 (1978-05-01), Bigi
patent: 4099945 (1978-07-01), Skolaude
patent: 4566887 (1986-01-01), Openshaw
Okada Hidetake
Urata Satoshi
Capossela Ronald C.
Nippon Sanso Kabushiki Kaisha
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