Process and installation for the production of gaseous oxygen under pressure

摘要

Process and apparatus for the production of gaseous oxygen under median pressure with a double distillation column (5). The low pressure column (7) of the double column (5)is operated under a pressure substantially greater than atmospheric pressure and slightly greater than the desired production pressure of oxygen, this low pressure being about 2 to 5 bars. The medium pressure column (6) of the double column (5) is under a corresponding pressure, namely, about 8 to 16 bars. The gaseous production oxygen is directly recovered from the base of the low pressure column, and the installation is maintained cold, at least in part, by free expansion of at least one gaseous product leaving the low pressure column.