Method for separating air by cryogenic distillation in column system, involves slacking super-cooled liquid from column by turbines, and sending diphasic flow product toward column that is operated at lower pressure

摘要

The method involves oxygenating an enriched liquid or oxygen enriched liquid (23) that is slackened and sent to a first column (K1). Nitrogen rich gas is tapped in the first column. Oxygen rich fluid is tapped into a tank of the first column. Liquid enriched of nitrogen is transferred to a second column (K2) towards the first column. A super-cooled liquid from a third column (K3) is slackened by turbines (T1-T6). A diphasic flow product is sent toward the third column operating at lower pressure. An independent claim is also included for an apparatus for separating air by cryogenic distillation in a column system.