Process and device for argon recovery

摘要

A separate rectification of an argon-oxygen mixture using recycled liquid from the crude argon column (10) is carried out in the low pressure column (1). Recovering argon in an air decomposition plant comprises decomposing compressed, pre-purified cooled air in a rectification system equipped with a rectification column and a crude argon column (10). An argon-oxygen mixture formed in a low pressure column (1) of the rectification system having rectifying devices and injected into the crude argon column equipped with rectification devices and a head condenser (14) is decomposed to crude argon head product and a sump liquid. A separate rectification of an argon-oxygen mixture using recycled liquid from the crude argon column (10) is carried out in the low pressure column (1). An Independent claim is also included for an apparatus for recovering argon.