| 摘要 |
1511976 Separation of gases LINDE AG 9 Aug 1976 [8 Aug 1975] 33165/76 Heading F4P In a two-stage rectification process, the lowpressure rectification column 2 is divided into upper and lower portions by a partition 13, and gas is withdrawn from the lower portion and blown into the upper portion. In an air separation process as shown, cooled compressed air is fed to high pressure column 1 via line 4, and crude oxygen and nitrogen are expanded into the low pressure column 2 via lines 5, 6, respectively. Product oxygen and nitrogen are withdrawn from column 2 via lines 7, 8. Oxygen rich air from column 1 is fed to a reflux condenser 10 and separated into liquid and gas fractions the liquid fraction being expanded at 12 to cool the condenser before being fed to an ejector 3 which effects the transfer of gas from the lower to the upper portion of column 2. In a modification, Fig. 2 (not shown), the O 2 -rich fraction from column 1 is expanded and fed to a heat-exchanger (17) at the head of column 1 before being fed to the ejector 3.
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