Process for recovering highly pure oxygen from less pure oxygen in a distillation system comprises cooling the heat exchange fluid downstream of the high pressure column sump vaporizer and upstream of a pressure relieving device

摘要

Process for recovering highly pure oxygen from less pure oxygen in a distillation system consisting of a high pressure column (2) and a low pressure column (3) comprises cooling the heat exchange fluid (107) downstream of the high pressure column sump vaporizer (4) and upstream of a pressure relieving device (109) in a sub-cooling heat exchanger (105) by indirect heat exchange. An Independent claim is also included for a device for recovering highly pure oxygen from less pure oxygen in a distillation system. Preferred Features: Gaseous heat exchange fluid (111) removed from the low pressure column head condenser (6) is heated in the sub-cooling heat exchanger. The heat exchange fluid is cooled upstream of the high pressure column sump vaporizer in a main heat exchanger (104) and the main heat exchanger and the sub-cooling heat exchanger are formed by an integrated heat exchanger block (103).