| abstract |
The method and the device are used for the low temperature separation of the air in a rectification system which has at least one pressure column (14) and one low pressure column (15). Feed air (1, 5) is compressed (3), cleaned in a cleaning stage (6), cooled (12) and at least partially introduced (13) into the pressure column (14). At least one liquid fraction (24) from the pressure column (14) is fed (26, 27) into the low pressure column (15). A nitrogen-containing fraction (32) from the low-pressure column (15) is heated (25, 12), recompressed (8) separately from the feed air and returned to the pressure column (14). |