Method and apparatus for separating air by cryogenic distillation
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United States of America Patent
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Dec 26, 2023
Grant Date -
Nov 25, 2021
app pub date -
May 5, 2021
filing date -
May 20, 2020
priority date (Note) -
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Abstract
In a method for separating air by cryogenic distillation using a column system consisting of a higher pressure column operating at a first pressure and a lower pressure column operating at a second pressure, a first air flow constituting between 75% and 98% of the air sent to the column system compressed to a third pressure above the first pressure, is sent to the higher pressure column, a second air flow constituting between 5% and 25% of the air sent to the column system is compressed to a fourth pressure above the second pressure but lower than the third pressure, is sent to the lower pressure column, a third column separates an argon-enriched flow and the air sent to the lower pressure column constitutes between 10% and 25% of the total air sent to the column system.
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