支撑层对硅橡胶复合膜渗透汽化分离性能的影响  

Influence of support layer of composite PDMS membranes on performance of hydrophobic pervaporation

作　　者：李磊[1] 谭淑娟[1] 蒋冬华[1] 武法文[1] 徐志红[1] 张志炳[1] 

机构地区：[1]南京大学化工系,江苏南京210093

出　　处：《化工学报》2006年第1期61-65,共5页CIESC Journal

摘　　要：Three types of composite PDMS membranes were prepared by using PAN, CA, and PVDF as support materials and used to separate ethanol from aqueous solution by pervaporation.The experimental results evidently demonstrated that the support layer had a significant impact on the flux and selectivity of composite PDMS membranes. The effect of the average pore size of supports on the performance of composite PDMS membranes was complex, and depended on many factors such as the physico-chemical properties of skin layers or supports and the preparation methods of composite membranes. The total flux of ethanol-water mixture through each composite PDMS membrane increased with increasing temperature. In contrast, the relation between selectivity and temperature was different due to various supports. With increasing feed concentration, the flux through each composite PDMS membrane increased quickly while the selectivity decreased.All these observation would be helpful to provide a guideline for the selection of an optimum support layer.Three types of composite PDMS membranes were prepared by using PAN, CA, and PVDF as support materials and used to separate ethanol from aqueous solution by pervaporation. The experimental results evidently demonstrated that the support layer had a significant impact on the flux and selectivity of composite PDMS membranes. The effect of the average pore size of supports on the performance of composite PDMS membranes was complex, and depended on many factors such as the physico-chemical properties of skin layers or supports and the preparation methods of composite membranes. The total flux of ethanol-water mixture through each composite PDMS membrane increased with increasing temperature. In contrast, the relation between selectivity and temperature was different due to increasing feed concentration, the flux through each composite PDMS membrane various supports. With increased quickly while the selectivity decreased. All these observation would be helpful to provide a guideline for the selection of an optimum support layer.

关 键 词：PDMS复合膜 渗透汽化 支撑层 乙醇-水溶液 传质 

分 类 号：TQ028.1[化学工程]