膜科学与技术

不同孔径PVDF/Hyflon复合膜在真空膜蒸馏中的应用

作者：张永兴¹，童大庆²，曹娟¹，汪朝晖¹，汪效祖¹

单位： 1.南京工业大学化学化工学院材料化学国家重点实验室，南京 210009； 2. 液化空气（扬州）有限公司，扬州市经济开发区维杨路18号，扬州 225009

关键词：聚偏氟乙烯，Hyflon AD60，孔径，真空膜蒸馏

出版年,卷(期):页码： 2016,36(1):93-98

摘要：

以三种不同孔径的商品化聚偏氟乙烯（PVDF）平板膜为基膜，浸涂Hyflon AD60后制成疏水型复合膜。在真空膜蒸馏（VMD）的脱盐试验中，考察膜孔径大小对真空膜蒸馏过程的影响。实验结果表明：在进料流量为80L/h、进料温度70℃以及真空度-90kPa条件下，原膜通量随孔径的增大而上升，但稳定性随之下降；经0.5wt%Hyflon AD60涂覆制备的复合膜均能稳定运行24h以上，最大孔径复合膜的平均通量可达31.57kg/(m2.h)，同时脱盐率均稳定在99.9%以上。

Composite membranes were prepared by coating a hydrophobic copolymer of Hyflon AD60 on porous flat sheet PVDF membranes with three different pore sizes. During the desalination tests using these original and composite membranes, the effect of mean pore sizes on vacuum membrane distillation (VMD) was investigated. The results showed that the flux of original membrane increased when mean pore size increased under the following conditions: (1) the feed temperature was 70℃, (2) feed flow rate was 80L/h, and (3) vacuum was -90kPa. However, its stability decreased. The composite membrane coated with 0.5wt% Hyflon AD60 could steadily run for over 24h. During this process, the biggest flux reached 31.57 kg/(m2.h) and the desalting rate constantly remained above 99.9%.

张永兴 (1990-)，男，硕士研究生，山东临沂市人，主要研究方向：高分子膜材料制备，Email: zyx9116@163.com，通讯作者：Email: wangxiaozu@njtech.edu.cn

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