PVDF膜在碱液下的性能衰减  

Performance degradation of PVDF membrane in alkali solution

作　　者：刘红晶[1] 焦阳[1] 李冬[1] 姚辉[1] 李波[1] LIU Hong-jing JIAO Yang LI Dong YAO Hui LI Bo(School of Petrochemical Engineering, Shenyang University of Technology, Liaoyang 111003, China)

机构地区：[1]沈阳工业大学石油化工学院,辽宁辽阳111003

出　　处：《沈阳工业大学学报》2017年第2期147-152,共6页Journal of Shenyang University of Technology

基　　金：教育部科学技术研究重点项目(210047);辽宁省自然科学基金资助项目(2014020117)

摘　　要：为了研究聚偏氟乙烯(PVDF)膜在碱液下的性能变化,采用单侧浸润方法对PVDF膜的接触角、临界水入口压力、气体渗透通量、孔径和孔隙率进行了分析.结果表明,当在浓度为1.5 mol/L的碱液中浸润300 h后,PVDF膜表面疏水性下降,膜孔被润湿,传质阻力增大.PVDF膜的疏水性随着碱液浓度的增加而降低.当PVDF膜的浸润时间为150~250 h时,PVDF膜的气体渗透通量和孔径的变化幅度最大.浸润300 h后,PVDF膜的孔隙率增加,传质系数降低,传质阻力增加.随着碱液浓度的增加,PVDF膜的结构性能变化得更为明显.In order to research the performance change of polyvinylidene fluoride（ PVDF） membrane in alkali solution,the contact angle,critical water inlet pressure for the membrane,gas permeation flux,pore size,and porosity of PVDF membrane were analyzed with the unilateral immersion method. The results showthat after immersing in the alkali solution with the concentration of 1. 5 mol / L for 300 h,the surface hydrophobic performance of PVDF membrane declines,the membrane pores are wetted,and the mass transfer resistance increases. In addition,the hydrophobic performance of PVDF membrane decreases with increasing the concentration of alkali solution. When the immersion time of PVDF membrane is between150 h and 250 h,the gas permeation flux and pore size exhibit the maximum variation amplitude. After immersing for 300 h,the porosity of PVDF membrane increases,the mass transfer coefficient decreases,and the mass transfer resistance increases. With increasing the concentration of alkali solution,the change in the structure and performance of PVDF membrane is more obvious.

关 键 词：聚偏氟乙烯 微孔膜 碱液 膜性能 膜润湿 传质系数 传质阻力 膜衰减 

分 类 号：TQ028.8[化学工程]