Method for performing cryogenic distillation of air to produce gaseous oxygen, involves compressing part of air in cold compressor and sending air to exchange line and to column of double column

摘要

The method involves cooling a part of air in a main exchange line (7) to an intermediate temperature of the exchange line for a double column (21). The part of air is compressed in a cold compressor (17) and is sent to the exchange line and to a column of the double column. Flow of nitrogen from a medium pressure column (19) is released in nitrogen turbines (31, 33). Flow of liquid oxygen is sent from a low pressure column (23) to a head of the mixing column. Flow of oxygen-enriched gas is removed from the head of the mixing column and is heated in the exchange line. An independent claim is also included for a cryogenic distillation apparatus.