Journal of South China University of Technology (Natural Science Edition) ›› 2014, Vol. 42 ›› Issue (10): 82-89.doi: 10.3969/j.issn.1000-565X.2014.10.014

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Application of Capillary Dynamics to Separation Process of Superhydrophilic Membrane and Its Mechanical Model

Yuan Teng1  Chen Zhuo2  Liu Wen-ji1  Zhou Xian-hong3  Tu Wei-ping1  Wang Feng1   

  1. 1. School of Chemistry and Chemical Engineering//Guangdong Provincial Key Laboratory for Green Chemical Product Technology, South China University of Technology, Guangzhou 510640, Guangdong, China; 2. School of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, Guangdong, China; 3. School of Chemistry and Environmental Engineering, Dongguan University of Technology, Dongguan 523808, Guangdong, China
  • Received:2014-05-08 Revised:2014-07-08 Online:2014-10-25 Published:2014-10-01
  • Contact: 王锋(1979-)，男，博士，主要从事功能性聚合物的合成与改性研究. E-mail:fengwang@scut.edu.cn
  • About author:袁腾(1987-)，男，博士生，主要从事膜技术及含油废水处理研究.E-mail：y.teng@mail.scut.edu.cn
  • Supported by:

    国家自然科学基金资助项目(50903031)；广州市国际科技交流与合作专项(2012J5100043)；华南理工大学中央高校基本科研业务费专项资金资助项目(2013ZM0072)；广东省绿色化学产品技术重点实验室开放基金资助项目(GC201201)

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Abstract:

The current oil/water separation membrane researches based on special wettability are seldom involved in the dynamic process of the membrane separation and the relevant quantitative calculations. In this paper, by analyzing the physical quantities of the superhydrophilic membrane separation process based on the capillary mechanics and by classifying the membrane pores of membrane materials based on special wettability as capillary pores, a mathematical model is constructed, and it is used to analyze the force distribution condition in the separation process of oilwater mixture by using the superoleophilic membrane. Then, the principle of the superhydrophilic and superoleophilic membrane in the air transforming to be superoleophobic underwater is analyzed from the perspective of surface tension, and the capillary flow rate, the capillary permeation rate, the membrane flux and the critical penetration pressure in the membrane separation process are calculated based on capillary mechanics and are validated by experiments. On this basis, the separation mechanism of superhydrophilic and underwater superoleophobic oil/water separation membrane is preliminarily discussed based on capillary mechanics.

Key words: capillary dynamics, superhydrophilic membrane, capillary, membrane separation, mechanical model, quantitative calculation, separation mechanism