学术论文

      陶瓷膜超滤过程研究及模型分析

      Process of ceramic ultrafiltration membrane and modeling analysis

      摘要:
      采用截留相对分子质量为8000的陶瓷膜,对聚乙二醇( PEG)溶液进行超滤实验,考察不同操作条件对陶瓷膜超滤过程分离性能的影响及膜污染机制,利用细孔模型对陶瓷超滤膜进行模拟表征,得出等效孔径和等效膜厚,并运用组合模型对膜污染内在机制进行分析。结果表明:细孔模型能较好地运用于陶瓷超滤膜微观结构的表征,通过对不同相对分子质量PEG超滤过程的拟合分析得出了膜结构参数;在操作压力为0?3 MPa、膜面流速为0?5 m/s条件下,PEG 20000的陶瓷膜超滤过程污染最严重,采用完全堵塞和滤饼过滤组合模型描述该过程的通量衰减趋势与实验值吻合良好。
      Abstract:
      The polyethylene glycol ( PEG) removal experiments with different molecular weights were carried out by molecular weight cut off ( MWCO) 8 000 ceramic membrane to investigate the effects on removal of different molecular weights PEG and the fouling mechanism. Pore model was modeled to characterize the effective pore diameter and thickness of the membrane, and the combined fouling model was borrowed to explain the internal factors of ultrafiltration fouling mechanism. Results showed that the pore model was simulated and well characterized for the equivalent pore size of the membrane. The fitting analysis of the membrane structure parameters was obtained through the ultrafiltration process of different molecular weights PEG. The cake?complete blocking model fitted accurately the experimental data for a TMP of 0?3 MPa and a crossflow velocity of 0?5 m/s.
      Author: SUN Pengfei XIE Yaping YANG Gang XING Weihong
      作者单位: 南京工业大学 化工学院 材料化学工程国家重点实验室,江苏 南京,210009
      年,卷(期): 2016, 38(6)
      分类号: TQ028.8
      在线出版日期: 2016年12月23日
      基金项目: 国家科技支撑计划