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首页> 外文期刊>Journal of Applied Polymer Science >Removal of n-butanol from aqueous solutions by ion-exchange membranes containing organic counterions
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Removal of n-butanol from aqueous solutions by ion-exchange membranes containing organic counterions

机译：通过含有有机抗衡离子的离子交换膜从水溶液中去除正丁醇

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摘要

The pervaporation of aqueous butanol solutions was investigated using thin-film composite membranes composed of a poly(vinylidene fluoride) substrate coated with a sulfonated poly(2,6-dimethyl-1,4-phenelene oxide) polymer. The polymer was ion-exchanged with quaternary ammonium cations having aliphatic substituents of various chain lengths. The pervaporation of aqueous n-butanol solutions using these membranes gave a permeate more concentrated in n-butanol; therefore, they were alcohol-selective. The separation factor increased and the permeate flux decreased as the chain lengths of the aliphatic substituents were increased. Hence, the mass-transport properties of such membranes can be controlled or altered to yield some desired permselectivity by the introduction of a proper counterion. It was observed that the n-butanol flux was small relative to the total flux and, therefore, the water flux dominated the total permeate flux. The degree of swelling of the membranes and its effect on membrane performance was investigated as well. As the n-butanol content was increased, the swelling of the membranes increased greatly. High membrane swelling caused a reduction in the separation factor.
机译：使用由涂有磺化聚（2,6-二甲基-1,4-苯撑氧）聚合物的聚偏二氟乙烯基材组成的薄膜复合膜研究丁醇水溶液的全蒸发。用具有各种链长的脂族取代基的季铵阳离子对聚合物进行离子交换。使用这些膜对正丁醇水溶液进行全蒸发，可以使渗透液更加浓缩在正丁醇中;因此，它们是酒精选择性的。随着脂族取代基链长的增加，分离因子增加，渗透通量减少。因此，可以通过引入适当的抗衡离子来控制或改变此类膜的传质性质，以产生一些所需的渗透选择性。观察到正丁醇通量相对于总通量较小，因此，水通量占总渗透物通量的主导。还研究了膜的溶胀程度及其对膜性能的影响。随着正丁醇含量的增加，膜的溶胀大大增加。较高的膜溶胀导致分离因子降低。

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