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    • 7. 发明授权
    • Method for preparing thin regenerated cellulose membranes of high flux
and selectivity for organic liquids separations
    • 制备高通量和有机液体分离选择性的薄再生纤维素膜的方法
    • US4496456A
    • 1985-01-29
    • US500966
    • 1983-06-03
    • Mahmoud M. HafezHenry W. Pauls
    • Mahmoud M. HafezHenry W. Pauls
    • B01D67/00B01D71/10C10G73/08C10G73/12B01D13/00
    • B01D67/0095B01D67/0011B01D71/10
    • A method is described for the production of regenerated cellulose membranes which method comprises the steps of:(a) dissolving a cellulose material to form a solution;(b) casting the cellulose solution into a film;(c) coagulating the cellulose solution film using an alkali alcoholic solution;(d) washing the coagulated cellulose film in an alcohol;(e) regenerating the cellulose film using acidic alcohol solution;(f) washing the regenerated cellulose membrane using an alcohol.The regenerated cellulose thus formed may be dried, if desired, preferably without a softener.The regenerated cellulose thus produced, when prepared in the form of a film or membrane, possesses higher flux and superior selectivity for organic liquid separation than regenerated cellulose membranes prepared employing aqueous solutions in steps b through e above and is most advantageously employed for the recovery of polar dewaxing solvents (e.g. ketones and mixed ketone/aromatic solvents) from dewaxed oil.
    • 描述了用于生产再生纤维素膜的方法,该方法包括以下步骤:(a)将纤维素材料溶解以形成溶液; (b)将纤维素溶液浇铸成膜; (c)使用碱醇溶液使纤维素溶液膜凝结; (d)在醇中洗涤凝固的纤维素膜; (e)使用酸性醇溶液再生纤维素膜; (f)使用酒精洗涤再生纤维素膜。 如果需要,如此形成的再生纤维素可以被干燥,优选没有软化剂。 因此制备的再生纤维素当以膜或膜的形式制备时,与使用上述步骤b至e中的水溶液制备的再生纤维素膜相比,具有更高的通量和对有机液体分离的优异选择性,并且最有利地用于回收 来自脱蜡油的极性脱蜡溶剂(例如酮和混合酮/芳族溶剂)。