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为将稀薄的乙醇水溶液浓缩,传统的蒸馏方法不能避免乙醇-水的共沸,能耗也很大。渗透汽化法克服了蒸馏法的这两个缺点,有希望成为分离乙醇水溶液的较为理想的方法。 作为水优先透过膜材料,有聚乙烯醇、磺化聚苯乙烯、聚丙烯腈、醋酸纤维素、聚乙烯亚胺、阴、阳离子交换膜阴、阳离子性多糖类、聚丙烯酸等及各种共聚物和共混
In order to concentrate thin aqueous ethanol solution, the traditional distillation method can not avoid ethanol-water azeotropic, energy consumption is also great. Pervaporation method to overcome the distillation of these two shortcomings, there is hope to become a more ideal method of separation of aqueous ethanol. As the water-preferentially permeable membrane material, there are polyvinyl alcohol, sulfonated polystyrene, polyacrylonitrile, cellulose acetate, polyethyleneimine, anion and cation exchange membranes, cationic polysaccharides, polyacrylic acids, and the like Copolymer and blend