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Dehydration of ethanol through blend membranes of chitosan and sodium alginate by pervaporation

机译：壳聚糖和海藻酸钠共渗膜对乙醇的全蒸发作用

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摘要

Polyion complex membranes made by blending 84% deacetylated chitosan and sodium alginate biopolymers followed by crosslinking with glutaraldehyde were tested for the separation of ethanol-water mixtures.The membranes were characterized by FTIR to verify the formation of the polyion complex,X-ray diffraction(XRD)to observe the effects of blending on crystallinity,DSC,and TGA to investigate the thermal stability,and tensile testing to assess their mechanical stability.The effect of experimental parameters such as feed composition,membrane thickness and permeate pressure on separation performance of the crosslinked membranes was determined.Sorption studies were carried out to evaluate the extent of interaction and degree of swelling of the blend membranes,in pure as well as mixtures of the two liquids.Crosslinked blend membranes were found to have good potential for breaking the azeotrope of 0.135 mol fraction of water and a high selectivity of 436 was observed at a reasonable flux of 0.22 kg/(m~210(mu m h).Membrane selectivities were found to improve with decreasing membrane pressure but remained relatively constant for variable membrane thickness.Increasing membrane thickness decreased the flux and higher permeate pressure caused a reduction in both flux and selectivity.
机译：测试了由84％脱乙酰壳聚糖和藻酸钠生物聚合物共混然后与戊二醛交联制备的聚离子复合膜对乙醇-水混合物的分离.FTIR表征该膜以验证聚离子复合物的形成，X射线衍射（ XRD）观察混合对结晶度，DSC和TGA的影响以研究热稳定性，并进行拉伸试验以评估其机械稳定性。进料组成，膜厚度和渗透压等实验参数对分离性能的影响确定了交联膜的性质。进行了吸附研究以评估共混膜在两种液体的纯净或混合状态下的相互作用程度和溶胀度。发现交联共混膜具有很好的破坏共沸膜的潜力。在合理的通量为0.2时观察到0.135摩尔分数的水和436的高选择性2 kg /（m〜210（mu m h））。发现膜选择性随着膜压力的降低而提高，但对于可变的膜厚度保持相对恒定;膜厚度的增加会降低通量，而较高的渗透压会导致通量和选择性的降低。

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