Air separation process with waste recycle for nitrogen and oxyge

Refrigeration – Processes – Circulating external gas

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62 39, 62 42, 62 44, F25J 302

Patent

active

048697427

ABSTRACT:
The present invention is an improved process for the production of nitrogen and oxygen that uses a double distillation column arrangement. The improvement to the process is the recycling of at least a portion of the oxygen-enriched waste stream to the bottom of the high pressure column. As a result of this improvement, the process is capable of making a nitrogen product with high purity (e.g., 5 ppm oxygen product) at high pressures (e.g., 40 to 150 psia) while simultaneously producing high purity oxygen (e.g., 99.6% oxygen). Nitrogen is produced only from the high pressure column.

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L. Celar, et al., "Flexible Process of Pressure Nitrogen and Low Pressure Oxygen Production".

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