| 摘要 |
The invention discloses process and apparatus for separating high purity oxygen and crude argon from air by fractional distillation. The improvement, which applies to both dual pressure and triple pressure configurations, entails maximizing the distillation efficiency of both the HP rectifier (2 of FIG. 1) and the LP N2 rectifier (1a and 1b) by feeding precisely correct quantities of liquid air reflux to each via respective valves (6) and (8). In order to efficiently produce the required amount of liquid air, liquid oxygen at least 0.2 ATA above LP column pressure is evaporated by two air condensers: a total condenser (22) and a partial condenser (23).
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