| 摘要 |
<p>Air is separated in a double distillation column 4 comprising lower and higher pressure distillation columns 8 and 6 respectively. Argon-enriched fluid is withdrawn from the lower pressure column 8 through outlet 46 and an argon product is separated therefrom in a further distillation column 34 provided with liquid argon reflux from a condenser 32 located in a liquid-vapour contact column 62. Liquid nitrogen is withdrawn from the higher pressure column 6, is passed through throttling value 60 and is reboiled in the condenser 32. The reboiled nitrogen is mixed in the column 62 with liquid oxygen withdrawn from the lower pressure column 6 through an outlet 64. A mixed gas stream is withdrawn from the column 62 through an outlet 70 and is expanded in turbine 72 or taken as product.</p> |
