Cryogenic process for producing low-purity oxygen

Details Cryogenic process for producing low-purity oxygen Cryogenic process for producing low-purity oxygen

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25

J

162/120

F25J 1/00 (2006.01) F25J 3/04 (2006.01)

Patent

CA 2014107

ABSTRACT This invention relates to an improved cryogenic separation process em- ploying a single pressure distillation column for the recovery of low purity, high pressure oxygen. The process uses two working fluids, i.e., high pres- sure air and high pressure nitrogen to effect reboil in the column. Both the condensed air and nitrogen streams are fed as reflux streams to the distil- lation column. The use of nitrogen reflux enhances oxygen recovery by enhancing purity of the nitrogen from the column.

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