RAW-MATERIAL AIR LOW-TEMPERATURE DISTILLATION METHOD MANUFACTURING EXTRA-HIGH PURITY OXYGEN PRODUCT

摘要

PURPOSE: To provide a process for producing ultra-high purity oxygen product through cryogenic distillation of feed air. CONSTITUTION: A first oxygen-containing but heavy contaminant-lean (free) stream 61 is removed from the main distillation system C1, C2 and subsequently stripped in an auxiliary distillation column C3. A second oxygen-containing but light contaminant-lean (free) gaseous stream 38 is also removed from the main distillation system and subsequently fed to the bottom section of the auxiliary distillation column C3 in order to provide heat duty/reboil of the auxiliary distillation column C3. The ultra-high purity oxygen product 64 is withdrawn from an intermediate section of the auxiliary distillation column C3.