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首页> 外文期刊>Separation and Purification Technology >Preparation and performance of poly(vinyl alcohol)/polyethyleneimine blend membranes for the dehydration of 1,4-dioxane by pervaporation:Comparison with glutaraldehyde cross-linked membranes
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Preparation and performance of poly(vinyl alcohol)/polyethyleneimine blend membranes for the dehydration of 1,4-dioxane by pervaporation:Comparison with glutaraldehyde cross-linked membranes

机译：渗透蒸发聚乙烯醇/聚乙烯亚胺共混膜的制备及性能研究：与戊二醛交联膜的比较

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摘要

Dense pervaporation (PV) membranes were prepared by blending hydrophilic polymers,poly(vinyl alcohol) (PVA) and polyethyleneimine (PEI),which was then cross-linked by glutaraldehyde (GA) to assess their suitability for the separation of 1,4-dioxane-water mixtures.The membranes were characterized by FTIR to verify the formation of the ionic interaction,wide-angle X-ray diffraction (WAXD) to observe the effect of blending on crystallinity and thermal gravimetric analysis (TGA) to investigate the thermal stability and tensile testing to asses their mechanical stability.The effects of experimental parameters,such as feed composition,permeate pressure and membrane thickness on normalized flux and selectivity were determined for both the membranes and compared.Uncross-linked PVA/PEI and cross-linked PVA/PEI blend membranes were subjected to sorption studies to evaluate the extent of interaction and degree of swelling in a mixture of the two liquids.The membranes were found to have good potential for breaking the azeotrope of 18 wt.% concentration of water,cross-linked PVA/PEI membrane (90 mu m thick) exhibited a lower flux (0.22 kg/(m~2 h)) and high selectivity (33.34) compared to PVA/PEI blend membrane.Separation factor was found to improve with decreasing feed water concentration,whereas flux decreased correspondingly.High permeate pressure caused a reduction in both flux and selectivity.
机译：通过混合亲水性聚合物，聚乙烯醇（PVA）和聚乙烯亚胺（PEI）制备致密的全蒸发（PV）膜，然后将其与戊二醛（GA）交联，以评估其是否适合分离1,4- FTIR对膜进行表征，以验证离子相互作用的形成;广角X射线衍射（WAXD）观察掺混对结晶度的影响;热重分析（TGA），研究热稳定性。测定了两种膜的进料组成，渗透压和膜厚等参数对归一化通量和选择性的影响，并进行了比较。未交联的PVA / PEI和交联的PVA对/ PEI共混膜进行吸附研究，以评估两种液体混合物中的相互作用程度和溶胀程度，发现膜具有良好的增效作用打破水含量为18 wt。％的共沸物的方法，交联的PVA / PEI膜（90微米厚）与之相比具有较低的通量（0.22 kg /（m〜2 h））和高选择性（33.34）。 PVA / PEI共混膜。分离系数随进水浓度的降低而提高，而通量相应降低。高渗透压引起通量和选择性的降低。

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