| 摘要 |
Nitrogen is separated from a first stream of compressed air in a higher pressure rectification column and from a second stream of compressed air in an intermediate pressure rectification column. Oxygen-enriched liquid is taken from the columns and separated in a lower pressure rectification column. An impure oxygen product is withdrawn in liquid state from the lower pressure column through an outlet. A part of the first air stream is condensed in a first condenser-reboiler, and a part of the second air stream is condensed in a third condenser-reboiler. Nitrogen separated in the higher pressure rectification column is condensed in a second condenser-reboiler, and nitrogen separated in the intermediate pressure rectification column is condensed in a fourth condenser-reboiler. The resulting nitrogen condensate is used as reflux in the columns. The condenser-reboilers provide reboil for the lower pressure rectification column.
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