支撑层结构对醇类渗透汽化过程的影响  

Influence of support layer structure on mass transport of alcohols by pervaporation

作　　者：罗莹[1] 李磊[1] 王辉[1] 谭淑娟[1] 张志炳[1] 

机构地区：[1]南京大学化学化工学院,江苏南京210093

出　　处：《化学工程》2008年第5期44-47,共4页Chemical Engineering(China)

基　　金：南京大学研究生科研创新基金项目(2005CL10)

摘　　要：研究了硅橡胶复合膜的支撑层结构对一系列不同分子体积的醇类的低浓度水溶液的渗透汽化过程的传质影响。研究发现支撑层对一系列醇的传质阻力的影响不仅取决于它的几何结构,也与支撑层的化学性质有关。聚二甲基硅氧烷-聚偏氟乙烯(PDMS-PVDF)复合膜与聚二甲基硅氧烷-聚酰胺(PDMS-PA)复合膜相比,对醇类化合物有着更好的渗透汽化表现。在30℃下醇类多组分体系通过PDMS-PVDF复合膜的总渗透通量为449.041 7 g/(m2.h),高于相同条件下PDMS-PA膜。通过选择合适的支撑层材料,改变支撑层的几何结构和疏水性,可以优化醇类组分的膜传质过程。The effect of the structures of support layers in the composite membranes on the mass transport of dilute aqueous solutions of homologous series of alcohols by pervaporation was investigated.The experimental results indicate that the influence of the support layer on the mass transfer of the alcohols depends not only on the geometric characteristics of the structure,but also on chemical properties.The polydimethyl siloxane-polyvinylidene fluoride（PDMS-PVDF） exhibits better pervaporation for the alcohols than polydimethyl siloxane-polyamide（PDMS-PA）.Total flux of alcohols mixture by PDMS-PVDF at 30 ℃ is 449.041 7 g/（m^2·h）,which is higher than that of PDMS-PA at the same conditions.With the optimal selection of support material and the proper adjustment of structure characteristics and hydrophobicity,the mass transport of alcohols can be improved greatly.

关 键 词：渗透汽化 支撑层 聚二甲基硅氧烷 聚酰胺 聚偏氟乙烯 

分 类 号：TQ021[化学工程]