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首页> 外文期刊>Separation and Purification Technology >Ageing of ion-exchange membranes used in electrodialysis: Investigation of static parameters, electrolyte permeability and tensile strength
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Ageing of ion-exchange membranes used in electrodialysis: Investigation of static parameters, electrolyte permeability and tensile strength

机译：用于电渗析的离子交换膜的老化：静态参数，电解质渗透性和拉伸强度的研究

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摘要

Ion-exchange membranes (IEM), used in some food industrial electrodialysis application, were researched by measuring their static parameters, electrolyte permeability and mechanical resistance in order to evaluate their evolution during this application. Two cation-exchange membranes (CEM) of Neosepta~R type and two anion- exchange membranes (AEM) of Neosepta~R type as well, were considered. Each pair was composed of a new sample and an extracted sample (used membrane) from an electrodialyzer after two years of operation. For both, CEM and AEM, there was a sevenfold decrease in permeability after use in that application. The tensile strength decreased by 1.5 times for CEM and eightfold for AEM. There was also a proof of loss of mechanical resistance of the used membranes. These observations may be attributed, on the one hand, to the inhibition and disappearance of a great part of the functional sites of the membranes, and on the other hand, to the degradation of the polymer itself. The fouling by organic species present in the solution might also be a significant cause of the permeability decrease. It turned out that the AEM was more affected than the CEM.
机译：通过测量其静态参数，电解质渗透性和机械阻力，研究了一些食品工业电渗析应用中使用的离子交换膜（IEM），以评估其在此应用中的发展。还考虑了两个Neosepta〜R型阳离子交换膜（CEM）和两个Neosepta〜R型阴离子交换膜（AEM）。每对都由新样品和经过两年操作后从电渗析仪中提取的样品（用过的膜）组成。对于CEM和AEM而言，在该应用中使用后，渗透率降低了七倍。 CEM的抗拉强度降低了1.5倍，AEM的抗拉强度降低了8倍。还证明了所用膜的机械阻力损失。这些观察结果一方面可以归因于膜的大部分功能位点的抑制和消失，另一方面归因于聚合物本身的降解。溶液中存在的有机物质造成的结垢也可能是渗透率降低的重要原因。事实证明，AEM比CEM受的影响更大。

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