| 摘要 |
A membrane separation process for the enrichment of at least one gas component in a gas flow, especially for the oxygen enrichment of the air and/or for the enrichment of carbon dioxide using a membrane separation device ( 10 ), which is a part of a membrane separation unit ( 2 ) and includes at least one membrane. The gas is separated into a retentate ( 8 ), which is discharged on the retentate side ( 12 ) of the membrane, and a permeate ( 9 ), which is discharged on the permeate side ( 11 ) of the membrane. To allow the separation of gases or the enrichment of a gas component in a gas flow at a low energy consumption rate and at low investment and production costs, the pressure of the gas stream is lowered before entering the membrane separation unit ( 2 ) so that pressure on the permeate side ( 11 ) is lower as compared with the inlet pressure.
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