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Priority permeable membrane is a new type of membrane separation technology. In the separation process, the vapor partial pressure difference of the components is used as the driving force, and the different adsorption-diffusion rates of each component in the permeable vaporization membrane material and the difference in molecular size are used to achieve selective separation between components.Its surface is a dense hydrophilic membrane layer, and the water molecules are preferentially adsorbed on the membrane surface, and the partial pressure difference of water vapor is formed under the action of vacuum, driving the water molecules to move downstream, so as to achieve the purpose of dehydration.