| 摘要 |
<p>Air is separated in an arrangement of rectification columns comprising a double rectification column 10 (which has a higher pressure column 4 and a lower pressure column 6), an intermediate pressure rectification column 24, and a side rectification column 52 communicating with the lower pressure column 6. The side rectification column 52 is provided with a condenser 50, and the intermediate pressure rectification column 24 with a reboiler 22 and a condenser 30. A stream of oxygen-enriched liquid is withdrawn from the bottom of the higher pressure column 4 through an outlet 16 and is separated in the intermediate pressure rectification column 24. The reboiler 22 is heated by a stream typically withdrawn from the side rectification column 52 through an outlet 81. A stream of liquid is withdrawn from the bottom of the intermediate pressure rectification column 24, is employed to cool the condenser 30, and is partially vaporised therein. A stream of residual liquid flows from the condenser 30 and is used to cool the condenser 50. <IMAGE></p> |
