| 摘要 |
<p>Cooled and purified air is introduced into a higher pressure rectifier 6 in at least partly vaporous state and is separated therein into oxygen-enriched liquid air and nitrogen. One part of the nitrogen so separated is condensed in a reboiler-condenser 12 and another part in a reboiler-condenser 16. Some of the condensate is used as reflux in the rectifier 6, and the rest of the condensate as reflux in a low pressure rectifier 4. Oxygen-enriched liquid air is taken from the bottom of the higher pressure rectifier 6 and is separated into oxygen and nitrogen in the lower pressure rectifier 4. A liquid argon-enriched oxygen stream is withdrawn from the lower pressure rectifier 4 through an outlet 42 and is separated into argon and oxygen fractions in a further rectifier 18. The further rectifier 18 is reboiled by the reboiler-condenser 16. <MATH></p> |
