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In an arrangement for removing water vapor from pressurized gases or gas mixtures, particularly from air, a membrane separating apparatus is provided wherein the gas-vapor stream is separated into a vapor-enriched permeate stream and a vapor-depleted retentate stream and the vapor enriched permeate

In an arrangement for removing water vapor from pressurized gases or gas mixtures, particularly from air, a membrane separating apparatus is provided wherein the gas-vapor stream is separated into a vapor-enriched permeate stream and a vapor-depleted retentate stream and the vapor enriched permeate stream is conducted to a vacuum pumping device for generating at the permeate side of the membrane separating apparatus a vacuum providing for a predetermined trans-membrane pressure ratio.

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1. An arrangement for removing water vapor from pressurized gases or gas mixtures, comprising a gas-vapor seperation structure in which a gas-vapor stream is separated into a vapor-enriched permeate stream and a vapor-depleted retentate stream, said separation structure including a membrane separati

1. An arrangement for removing water vapor from pressurized gases or gas mixtures, comprising a gas-vapor seperation structure in which a gas-vapor stream is separated into a vapor-enriched permeate stream and a vapor-depleted retentate stream, said separation structure including a membrane separating apparatus having a retentate side and a permeate side and a mixture inlet, a membrane with a selectivity of .alpha.=100 to 10,000 disposed between and separating said retentate side from said permeate side, a vapor-depleted gas outlet in communication with the retentate side of said membrane separating apparatus and a vapor-enriched gas outlet in communication with the permeate side of said membrane separating apparatus, means for supplying said pressurized gas including said vapors to said membrane separating apparatus, wherein said gas-vapor stream is separated into said vapor depleted retentate stream remaining on the retentate side of said membrane separating apparatus and said vapor-enriched permeate stream at the permeate side of said membrane separating apparatus, and a vacuum pumping device connected to said vapor-enriched gas outlet for generating a vacuum at the permeate side of said membrane separating apparatus.