Hyflon AD60/PVDF复合膜的制备及其膜蒸馏性能研究

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• 英文论文题名：Hyflon AD60/PVDF composite membrane preparation and its performance in membrane distillation
• 论文作者：崔朝亮 ; 汪朝晖 ; 童大庆 ; 汪效祖
• 英文论文作者：CUI Zhaoliang ; WANG Zhaohui ; TONG Daqing ; WANG Xiaozu ; State Key Laboratory of Materials-Oriented Chemical Engineering ; National Engineering Research Center for Special Separation Membrane ; College of Chemical Engineering ; Nanjing Tech University
• 年：2016
• 作者机构：南京工业大学化工学院材料化学工程国家重点实验室国家特种分离膜工程技术研究中心;
• 论文关键词：Hyflon AD60 ; PVDF ; 复合膜 ; 真空膜蒸馏
• 英文论文关键词：Hyflon AD60 ; PVDF membrane ; composite membrane ; membrane distillation
• 会议召开时间：2016-11-25
• 会议录名称：第五届全国膜分离技术在冶金工业中应用研讨会论文集
• 语种：中文
• 分类号：TQ051.893
• 学会代码：LXJT
• 会议名称：第五届全国膜分离技术在冶金工业中应用研讨会
• 会议地点：中国湖南长沙
• 主办单位：中国膜工业协会、中南大学
• 学会名称：中国蓝星(集团)总公司膜科学与技术编辑部
• 页数：1
• 文件大小：56k
• 原文格式：O
• 会议级别：全国

摘要

在膜蒸馏过程中,疏水性是避免膜孔润湿的重要性能之一~([1-2])。本文在聚偏氟乙烯(PVDF)膜表面涂覆新型聚合物Hyflon AD60,制备了高疏水性Hyflon AD60/PVDF复合膜,并研究了其膜蒸馏(MD)性能。考察了Hyflon AD60浓度、涂覆时间、热处理温度及热处理时间对复合膜结构和真空膜蒸馏(VMD)性能的影响.结果显示,PVDF膜的疏水性大幅提高,真空膜蒸馏性能得到明显加强。采用35 g/L的NaCl溶液,在0.09 MPa真空度,进水温度70℃条件下,Hyflon AD60/PVDF中空纤维复合膜的水通量和盐截留率分别达到10 kg/(m~2·h)和90%以上,并且能够长期保持稳定,显示了良好的真空膜蒸馏性能.
Hydrophobicity is one of the most important factors tor avoiding pore wetting phenomenon in membrane distillation(MD) process.In the present study,a novel polymer Hyflon AD60 was employed to coat on PVDF membrane surface to fabricate Hyflon AD60/PVDF composite membrane with highly hydrophobic property,and its performance in membrane distillation was tested.The effects of Hyflon AD60 concentration,coating time,heat treatment temperature and heat treatment time on the structure and performances in vacuum membrane distillation(VMD) were investigated.The results show that the hydrophobicity of the PVDF membrane was significantly increased,and the performance of membrane distillation was obviously improved.Using NaCl solution with concentration of 35 g/L as feed,under vacuum pressure of 0.09 MPa,and feed temperature of 70 ℃,the pure water flux and salt rejection of the Hyflon AD60/PVDF hollow fiber membrane reached to above 10 kg/(m~2 · h) and 99.9%,respectively.The VMD operation ran long time,indicating the composite membrane possesses an excellent performance in MD process.

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