| 摘要 |
The low energy triple distillation pressure process for producing high purity industrial oxygen is improved in several ways, including higher O2 pressure, higher recovery of both oxygen and crude argon, and lower N2 content in the argon. This is done with the traditional triple pressure column arrangement (columns 22, 24, and 27 of FIG. 1) preferably by totally condensing liquid air in reboiler 21 and then splitting it with valves 42 and 43; by providing all LN2 reflux duty from reboiler 26; by evaporating product oxygen in 23 with partially condensing air; and by intermediate refluxing column 27 with condenser 28 which provides a separate vapor stream to column 22.
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