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首页> 外文期刊>Journal of Applied Polymer Science >Pervaporation Properties of a Three-Layer Structure Composite Membrane
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Pervaporation Properties of a Three-Layer Structure Composite Membrane

机译：三层结构复合膜的渗透汽化特性

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摘要

A novel composite membrane with a three-layer structure has been prepared. The top layer is a thin dense film of chitosan crosslinked with glutaraldehyde, and the support layer is made of microporous polyacrylonitrile (PAN). Between the dense and the microporous layer, there is an intermolecular crosslinking layer. The performance data show that this is an excellent pervaporation membrane for alcohol dehydration and one-stage separation is attainable for some alcohol/water mixtures such as ethanol/water and isopropanol/water systems, which has a good separation factor of 1410 and a good flux of 0.33 kg m~(-2) h~(-1) for the EtOH/H_2O mixture, and 5000 and 0.43 kg m~(-1) for the i-PrOH/H_2O mixture usig 90 wt % alcohol concentration at 70degC. Using 90 wt % methanol aqueous solution at 60degC, a flux of 0.17 kg m~(-2) h~(-1) and selectivity of 123 are also obtained. The structure and performance of the novel composite membrane varies with conditions of membrane preparation, such as hydrolysis degree of PAN membrane, content of crosslinking agent, and heat-curing temperature. The results indicate that the separation factor and the permeation rate of this novel composite membrane increase with the increase of operating temperature. At the same time, the pervaporation properties can be adjusted by changing the structure of the same time, the pervaporation properties can be adjusted by changing the structure of the top layer and the middle layer.
机译：制备了具有三层结构的新型复合膜。顶层是与戊二醛交联的壳聚糖的致密薄膜，支撑层由微孔聚丙烯腈（PAN）制成。在致密层和微孔层之间，存在分子间交联层。性能数据表明，这是一种出色的酒精脱水渗透膜，对于某些酒精/水混合物（如乙醇/水和异丙醇/水系统）可以实现一级分离，分离系数为1410，通量良好对于EtOH / H_2O混合物，其0.33 kg m〜（-2）h〜（-1），对于i-PrOH / H_2O混合物，其5000和0.43 kg m〜（-1）在70℃下使用90 wt％的酒精浓度。在60℃下使用90wt％的甲醇水溶液，通量为0.17kg m·（-2）h·（-1），选择性为123。新型复合膜的结构和性能随制膜条件的变化而变化，例如PAN膜的水解度，交联剂含量和热固化温度。结果表明，该新型复合膜的分离系数和渗透率随操作温度的升高而增加。同时，可以通过改变相同的结构来调节全蒸发性能，可以通过改变顶层和中间层的结构来调节全蒸发性能。

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