分离甲醇水溶液复合渗透汽化膜的制备与研究  

Preparation and investigation of composite pervaporation membrane for separating methanol-water solution

作　　者：张玲[1] 孙元[1] 邓新华[1,2] 刘鲜红[1] 罗衍慧[1] 

机构地区：[1]天津工业大学材料科学与工程学院,天津300160 [2]天津工业大学中空纤维膜材料与膜过程教育部重点实验室,天津300160

出　　处：《天津工业大学学报》2010年第2期1-4,共4页Journal of Tiangong University

基　　金：天津市自然科学基金重点资助项目(013801811)

摘　　要：用交联聚乙烯醇膜上下包覆添加纳米SiO2粉末的丙烯酸/丙烯腈共聚膜,制备出新型优先透水复合渗透汽化膜,通过扫描电镜、红外光谱分析等方法对复合渗透汽化膜进行了结构表征,并通过渗透汽化实验对甲醇质量分数为85%～98%的水溶液进行分离.结果表明:添加纳米SiO2粉末后膜的分离性有显著提高,当纳米SiO2质量分数达到0.15%时,在65℃对98%甲醇溶液进行分离,其分离因子可达1 534,通量可达583 g/(m2.h),与不添加SiO2纳米粉末的膜相比,分离因子可提高8倍.通过对不同浓度甲醇水溶液的分离实验确认,所制备的渗透汽化复合膜适用于高浓度甲醇溶液的分离.A new type of composite membranes are prepared for separating methanol-water solution which have a priority for permeating water. The acrylic acid （AA）/acrylonitrile （AN） copolymer membrane with nanometer SiO2 is made into main body of the membranes, then composited with the polyvinylalcohol （PVA）acetal membranes, to make the three-layer sandwich composite pervaporation membranes. The structure of composite membrane is analyzed by Scanning Electron Microscopy, Fourier Transform Infrared Spectroscopy, and the pervapora- tion of composite membrane is investigated through the separation experimental for methanol 85%-98% aqueous solution. The results show that with addition of nano-SiO2 the separation of composite membrane has notable improvement. With 0.15% addition of nano-SiO2, the composite membranes can separate 98% methanol solution at 65 ~C, the separation factor is up to 1 534, and which is improved more than 8 times compared with the membrane without nano-SiO2, the permeate flux is up to 583 g/（m^2·h）. Through separation of different concentrations methanol solution, it is concluded that the composite membrane is applicable for high concentration of methanol solution.

关 键 词：甲醇/水溶液 渗透汽化膜 丙烯酸/丙烯腈共聚 纳米SIO2 

分 类 号：TS102.54[轻工技术与工程—纺织工程] TQ028.8[轻工技术与工程—纺织科学与工程]