| 摘要 |
The invention relates to a process for cryogenic air separation in a distillation system comprising a high pressure column (7), a low pressure column (8), a side condenser (10) having an evaporation space and a crude argon distillation system comprising at least a first crude argon column (12). Feed air is compressed and purified. At least a portion of the purified feed air (1) is cooled in a main heat exchanger. At least a portion of the cooled feed is fed to the high pressure column (7). A first liquid oxygen stream (48) withdrawn from the low pressure column (8) is at least partially evaporated in the evaporation space of the side condenser (10) by indirect heat exchange with a heating medium (49). A first gaseous oxygen stream (51) produced by the evaporation of the first liquid oxygen stream is withdrawn from the evaporation space of the side condenser (10), warmed in the main heat exchanger (3) and finally withdrawn as a first gaseous oxygen product stream (LP-GOX). A liquid purge stream (59) is withdrawn from the side condenser. The liquid purge stream (59) is introduced into the crude argon distillation system.
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