热致相分离聚乙烯-聚丙烯共混平板疏水微孔膜的制备及其膜蒸馏性能研究
作者:唐娜12,蒋建伟12,袁丽娜12,张蕾12,韩怀远12
单位: 1. 天津科技大学 海洋科学与工程学院,天津 300457;
关键词: 热致相分离;聚乙烯;聚丙烯;共混膜;膜蒸馏
分类号: TQ028.8
出版年,卷(期):页码: 2013,33(6):47-52

摘要:
采用热致相分离法制备聚乙烯(PE)-聚丙烯(PP)-豆油体系共混微孔疏水膜,膜的支撑材料为聚对苯二甲酸乙二酯(PET),研究了淬冷温度、PE和PP质量比、稀释剂萃取时间等制膜条件以及膜蒸馏操作条件对膜蒸馏分离性能的影响。结果表明:PE-PP共混膜最佳成膜条件为:铸膜液温度为220℃,铸膜液中 PE-PP共混物质量分数为30%、PE和PP的质量比为1:6,成核剂己二酸质量分数为0.3%、平均膜厚度为225μm、淬冷水温为45℃、正己烷萃取时间为24h。此条件下制备的平均孔径为0.16μm的PE-PP共混膜在真空度为0.095MPa、进料温度为348.15K、进料流量为35L•h-1的操作条件下膜蒸馏纯水通量可达10.68kg•m-2•h-1,截留率高于99.8%。
Hydrophobic microporous membranes were prepared via the thermally induced phase separation process (TIPS) using polyethylene (PE) and polypropylene (PP). Polyethylene terephthalate (PET) was chosen as the membrane supporting material and oil bean was  the dilute. The effects of membrane formation conditions such as the quenching temperature, mass ratio of PE and PP, extraction time and the operating conditions of VMD were studied in this work. The results showed that the optimized membrane formation conditions were: the temperature of casting solution was 220℃, the concentration of PP and PE blends in casting solution was 30%, mass ratio of PE and PP was 1:6, the nucleating agent concentration of adipic acid was 0.3%, the average thickness of membrane was 225μm, the quenching temperature was 45℃, the extraction time of n-hexane was 24h. VMD pure water flux of membrane reached 10.68 kg•m-2•h-1 and the salt rejection was higher than  99.8%, the average of co-blending membrane was 0.16 μm which was prepared at the optimized membrane formation conditions, and VMD operated conditions were:  the vacuum was 0.095 MPa,  the temperature and flow rate of recycling water were 348.15K and 35 L•h-1 respectively.

基金项目:
天津市海洋局科技兴海项目(KX2010_0010) ,天津市滨海新区科委小巨人项目(2011-XJR13020)

作者简介:
唐 娜(1972-),女,辽宁海城市人,博士,教授,博士研究生导师。主要研究方向:膜分离、海卤水资源综合利用.(tjtangna@tust.edu.cn)

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