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首页> 外文期刊>Separation and Purification Technology >Pervaporation of benzene/cyclohexane mixtures through rhodium-loaded β-zeolite-filled polyvinyl chloride hybrid membranes
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Pervaporation of benzene/cyclohexane mixtures through rhodium-loaded β-zeolite-filled polyvinyl chloride hybrid membranes

机译：负载铑的β-沸石填充的聚氯乙烯杂化膜对苯/环己烷混合物的全蒸发

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摘要

Novel hybrid membranes were prepared by incorporating H-β-zeolite or Rh-loaded H-β-zeolite (Rh/H-β-zeolite) into polyvinyl chloride (PVC) for the pervaporative separation of benzene and cyclohexane. The membranes were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) to assess their morphology. The characteristics of these membranes for separating benzene/cyclohexane mixtures were investigated by varying zeolite content, feed composition and operating temperature. The results showed a typical trade-off curve; fluxes increased and selectivity decreased with the increase of benzene concentration in feed composition. The pervaporation performance for membranes filled with Rh/H-β-zeolite was much better than that for pure PVC membrane and membranes filled with H-β-zeolite. It might be caused by the special interaction between benzene and Rh/H-β-zeolite found by IGC previously. And the membrane containing 7 wt% of Rh/H-β-zeolite showed the highest separation selectivity of benzene at all feed compositions. From the temperature-dependent permeating values, the Arrhenius activation parameters were estimated. The resulting lower apparent activation energy values for permeation flux obtained for the Rh/H-β-zeolite-filled membranes compared to the H-β-zeolite-filled membranes were attributed to the special interaction between Rh/H-β-zeolite and benzene.
机译：通过将H-β-沸石或负载Rh的H-β-沸石（Rh /H-β-沸石）掺入聚氯乙烯（PVC）中以进行苯和环己烷的渗透汽化分离来制备新型杂化膜。通过扫描电子显微镜（SEM）和X射线衍射（XRD）对膜进行表征，以评估其形态。通过改变沸石含量，进料组成和操作温度来研究分离苯/环己烷混合物的这些膜的特性。结果显示出典型的权衡曲线;随着进料组成中苯浓度的增加，通量增加而选择性降低。 Rh /H-β-沸石填充的膜的渗透蒸发性能要比纯PVC膜和H-β-沸石填充的膜的渗透蒸发性能好得多。这可能是由于IGC先前发现的苯与Rh /H-β-沸石之间的特殊相互作用引起的。并且在所有进料组成中，含有7wt％的Rh /H-β-沸石的膜显示出最高的苯分离选择性。从取决于温度的渗透值，估算出阿累尼乌斯活化参数。与填充H-β-沸石的膜相比，填充Rh /H-β-沸石的膜获得的较低的渗透通量活化能值归因于Rh /H-β-沸石与苯之间的特殊相互作用。

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