| 摘要 |
An apparatus and method useful for enriching the concentration of a preferentially permeable component of a gas mixture uses a membrane process with a selective by gas permeable membrane. The membrane is located within a separation unit (30) which encloses a retentate chamber and a permeate chamber. The suction of a gas moving device (45), such as a vacuum pump, draws from the permeate chamber a permeate composition enriched in the preferentially permeable component. Instead of forcing the gas mixture under pressure into the retentate chamber, an unpressurized mixture (31) is drawn into the retentate chamber by suction of a gas moving device (43) such as a vacuum pump, fan or blower, connected to the discharge port (33) of the retentate chamber. A substantial increase in the concentration of preferentially permeable component in the permeate gas can be achieved by pulling the gas mixture from the retentate chamber rather than pushing it into the chamber.
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