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首页> 外文期刊>Journal of Applied Polymer Science >Preparation of crosslinked alginate composite membrane for dehydration of ethanol-water mixtures
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Preparation of crosslinked alginate composite membrane for dehydration of ethanol-water mixtures

机译：用于乙醇-水混合物脱水的交联海藻酸盐复合膜的制备

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The purpose of this article was to develop new membranes with a high selectivity and permeation rate for separation of an alcohol/water system. Crosslinked alginate composite membranes were prepared by casting an aqueous solution of alginate and 1,6-hexanediamine (HDM) onto a hydrolyzed microporous polyacrylonitrile (PAN) membrane. The influence of hydrolysis of the support membrane and crosslinking agent content in a dense layer on the selectivity and flux was studied and it was shown that both could improve the separation performance of the composite membrane greatly. The countercation of alginate coatings as a dense separating layer also influenced the separation properties of the membrane, which was better for K+ than for Na+. This novel composite membrane with K+ as a counterion has a high separation factor of 891 and a good permeation rate of 591 g m(-2) h(-1) for pervaporation of a 90 wt % ethanol aqueous solution at 70 degrees C. At the same time, SEM micrographs showed that the pore structure of the PAN microporous membrane is changed by hydrolysis. The reason for the influence of the preparation conditions on the separation performance of the novel membrane is discussed. (C) 2000 John Wiley & Sons, Inc. [References: 10]
机译：本文的目的是开发一种具有高选择性和高渗透率的新型膜，用于分离酒精/水系统。通过将藻酸盐和1,6-己二胺（HDM）的水溶液浇铸到水解的微孔聚丙烯腈（PAN）膜上来制备交联的藻酸盐复合膜。研究了支撑膜的水解和致密层中交联剂含量对选择性和通量的影响，结果表明两者都可以大大提高复合膜的分离性能。海藻酸盐涂层作为致密的分离层的抗衡阳离子也影响了膜的分离性能，对K +而言比对Na +更好。这种新型的以K +作为抗衡离子的复合膜具有90的高分离因子，在70℃时90％的乙醇水溶液可全蒸发，渗透率达591 gm（-2）h（-1）。同时，SEM显微照片显示，PAN微孔膜的孔结构由于水解而改变。讨论了制备条件对新型膜分离性能影响的原因。 （C）2000 John Wiley＆Sons，Inc. [参考：10]

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