SCI和EI收录∣中国化工学会会刊

›› 2008, Vol. 16 ›› Issue (1): 79-83.

• SELECTED PAPERS FROM THE 4th INTERNATIONAL SYMPOSIUM ON DESIGN, OPERATION AND CONTROL OF CHEMICAL PROCESSES • Previous Articles     Next Articles

Mass Transfer Modeling in Pervaporation Based on Multi-fields Synergy Theory

LEI Zhen, WU Yingying, LU Shiqing, YANG Bolun   

  1. Department of Chemical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
  • Received:2007-05-10 Revised:2007-10-27 Online:2008-02-28 Published:2008-02-28
  • Supported by:
    the Key Project of National Natural Science Foundation of China (No.20436040);the National Natural Science Foundation of China (No.20476084, No.20776117)

Mass Transfer Modeling in Pervaporation Based on Multi-fields Synergy Theory

雷震, 吴莹莹, 路士庆, 杨伯伦   

  1. Department of Chemical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
  • 通讯作者: YANG Bolun, E-mail: blunyang@mail.xjtu.edu.cn
  • 基金资助:
    the Key Project of National Natural Science Foundation of China (No.20436040);the National Natural Science Foundation of China (No.20476084, No.20776117)

Abstract: To provide a theoretical basis for optimizing the pervaporation procedure, a mass transfer model for pervaporation for binary mixtures was developed based on the multi-fields synergy theory. This model used the mechanism of sorption-diffusion-desorption and introduced a diffusion coefficient, which was dependent on the feed concentration and temperature. Regarding the strong coupling effect in the mass transfer, the concentration distribution in membrane was predicted using the Flory-Huggins thermodynamic theory. The batch experiments and other experiments with constant composition were conducted using a modified chitosan pervaporation membrane to separate tert-butyl alcohol (TBA)-water mixtures. The parameters of the mass transfer model were obtained from the flux of the experiments with a constant composition and the activity coefficients available through phase equi-librium equation, using the Willson equation in the feed side and the Flory-Huggins thermodynamic theory within the membrane. The simulation results of the experiments are in good agreement with the results of the experiments.

Key words: pervaporation, membrane, mass transfer model, multi-fields synergy theory, coupling effect

摘要: To provide a theoretical basis for optimizing the pervaporation procedure, a mass transfer model for pervaporation for binary mixtures was developed based on the multi-fields synergy theory. This model used the mechanism of sorption-diffusion-desorption and introduced a diffusion coefficient, which was dependent on the feed concentration and temperature. Regarding the strong coupling effect in the mass transfer, the concentration distribution in membrane was predicted using the Flory-Huggins thermodynamic theory. The batch experiments and other experiments with constant composition were conducted using a modified chitosan pervaporation membrane to separate tert-butyl alcohol (TBA)-water mixtures. The parameters of the mass transfer model were obtained from the flux of the experiments with a constant composition and the activity coefficients available through phase equi-librium equation, using the Willson equation in the feed side and the Flory-Huggins thermodynamic theory within the membrane. The simulation results of the experiments are in good agreement with the results of the experiments.

关键词: pervaporation, membrane, mass transfer model, multi-fields synergy theory, coupling effect