Method and system for the production of pressurized air gas by cryogenic distillation of air
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United States of America Patent
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Apr 17, 2018
Issued Date -
N/A
app pub date -
Apr 6, 2004
filing date -
May 5, 2003
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Abstract
Methods and apparatus for cryogenic distillation of air. In a system of air separation columns, all the air is taken to a high pressure which is 5 to 10 bar greater than a medium pressure. A portion of air, between 10% and 50% of the high pressure air stream, is boosted in a cold booster. This boosted air is then sent to an exchanger and a portion of it liquefies at the cold end of the exchanger. Part of the air is sent to one column of the column system, and another fraction is partly expanded in a Claude turbine. After expansion in the turbine, the air is sent to a medium pressure column, and a liquid stream is withdrawn for one of the columns of the system. The withdrawn stream is pressurized and vaporizes in the exchange line. The cold booster is coupled to either an expansion turbine, an electric motor, or a combination of the two.
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