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通过浸渍-提拉的方法制备了PDMS涂覆的Al2O3中空纤维膜,并系统地研究了其用于ABE/水体系的分离过程。首先对制备出的膜进行了形貌表征,SEM电镜照片表明,所用的Al2O3中空纤维支撑体具有非对称结构,海绵孔位于膜壁的中间而指状孔在其两侧。制备出的PDMS涂覆的Al2O3中空纤维复合膜表面致密完好没有缺陷,其厚度小于10μm,说明PDMS层被均匀地涂在支撑体外表面。然后在不同的模拟体系(丙酮-水、丁醇-水、乙醇-水)中,系统地考察了复合膜的性能。实验表明,复合膜具有优异的渗透汽化性能(通量和分离因子)。最后将该复合膜用于ABE-水体系的分离,考察了膜在操作过程中的渗透汽化性能和稳定性,同时将二元体系与四元体系过程对比,讨论渗透汽化对ABE体系的分离作用。
PDMS-coated Al2O3 hollow fiber membranes were prepared by impregnation-pulling method and their separation process was systematically studied for ABE / water system. The morphology of the prepared membrane was first characterized by SEM and electron microscopy. The results showed that the hollow fiber support used had an asymmetric structure. The sponge pores were located in the middle of the membrane wall and the finger holes were on both sides. The prepared PDMS-coated Al2O3 hollow fiber composite membrane has no defects on the surface, and its thickness is less than 10 μm, indicating that the PDMS layer is evenly coated on the outer surface of the support. Then, the properties of the composite films were investigated systematically in different simulation systems (acetone-water, butanol-water, ethanol-water). Experiments show that the composite membrane has excellent pervaporation properties (flux and separation factor). Finally, the composite membrane was used for the separation of ABE-water system. The pervaporation performance and stability of the membrane during the operation were investigated. Meanwhile, the binary system was compared with the quaternary system process, and the separation effect of pervaporation on ABE system was discussed .