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首页> 外文期刊>Separation and Purification Technology >Pervaporation of isopropanol-water mixtures through polyion complex membranes
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Pervaporation of isopropanol-water mixtures through polyion complex membranes

机译：通过聚离子复合膜对异丙醇-水混合物进行全蒸发

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摘要

Polyion complex membranes made by blending 84% deacetylated chitosan and poly(acrylic acid)were tested for the separation of isopropanol-water mixtures.The membranes were characterized by FT-IR to verify the formation of the polyion complex,XRD to observe the effects of blending on crystallinity,DSC 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 polyion membranes,in pure as well as mixtures of the two liquids.Amongst the blends tested,the crosslinked membranes having 60 wt.% of chitosan were found to have good potential for breaking the aqueous azeotrope of 87.5 wt.% of Isopropanol yielding a high selectivity of 1736 at a reasonable flux of 0.14 kg/m~2 h 10 mum.Membrane selectivities were found to improve with decreasing permeate pressure but remained relatively constant for variable membrane thickness.Increasing membrane thickness decreased the flux and higher permeate pressure caused a fall in membrane performance.
机译：测试了由84％脱乙酰壳聚糖和聚丙烯酸共混而成的聚离子复合膜对异丙醇-水混合物的分离性能。用FT-IR表征该膜，以验证聚离子复合物的形成，XRD观察其作用。共混物的结晶度，DSC的热稳定性研究和拉伸试验以评估其机械稳定性。确定了进料组成，膜厚度和渗透压等实验参数对交联膜分离性能的影响。以评估纯液体以及两种液体的混合物中聚离子膜的相互作用程度和溶胀度。在测试的共混物中，发现具有60 wt。％壳聚糖的交联膜具有良好的破乳潜力。异丙醇含量为87.5 wt％的含水共沸物，在0.14 kg / m〜2 h 10 mum的合理通量下可产生1736的高选择性。发现选择性随着渗透压力的降低而提高，但对于可变的膜厚度却保持相对恒定。增加膜厚度会降低通量，而更高的渗透压力会导致膜性能下降。

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