Pervaporation of benzene/cyclohexane mixtures through rhodium-loaded beta-zeolite-filled polyvinyl chloride hybrid membranes

作者：Zhang Xiali; Qian Linping; Wang Haitao^*; Zhong Wei; Du Qiangguo

来源：Separation and Purification Technology, 2008, 63(2): 434-443.

DOI：10.1016/j.seppur.2008.05.028

• Pervaporation
• Polyvinyl chloride
• Rhodium-loaded H-beta-zeolite
• Permeation activation energy
• Benzene/cyclohexane

Novel hybrid membranes were prepared by incorporating H-beta-zeolite or Rh-loaded H-P-zeolite (Rh/HP-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-beta-zeolite was much better than that for pure PVC membrane and membranes filled with H-beta-zeolite. It might be caused by the special interaction between benzene and Rh/H-beta-zeolite found by IGC previously. And the membrane containing 7 wt.% of Rh/H-beta-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-beta-zeolite-filled membranes compared to the H-beta-zeolite-filled membranes were attributed to the special interaction between Rh/H-P-zeolite and benzene.

• 出版日期2008-10-22
• 单位复旦大学