| 摘要 |
PURPOSE:To reduce the flow resistance of a gas by condensing forcibly the vapor in a vapor chamber to reduce the partial pressure of the vapor, increasing the vaporization velocity on the surface of a separation membrane, and decreasing the flow rate of the gas in a discharge pipeline in the pervaporation method. CONSTITUTION:A liq. chamber 2 and a vapor chamber 3 are separated by a separation membrane 1, and the cooling surface 4 of a shell and tube heat exchanger, etc. is provided in the vapor chamber 3. A liq. mixture to be treated is supplied into the liq. chamber 2 from a liq. supply port 7, and the pressure in the vapor chamber 3 is reduced by a vacuum pump 6. A liq. component which is vaporized after permeating through the separation membrane 1 from the liq. chamber 2 is brought into contact with the cooling surface 4, and a part of the whole of the vapor is condensed. Consequently, the partial pressure of the vapor in the vapor chamber is reduced, the amt. of gas to be discharged from a gas discharge port 10 is reduced, and hence the flow resistance of the gas in a discharge pipe-line connected to the gas discharge port 10 is decreased.
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