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

Abstract

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

LEI Zhen, WU Yingying, LU Shiqing, YANG Bolun. Mass Transfer Modeling in Pervaporation Based on Multi-fields Synergy Theory[J]. , 2008, 16(1): 79-83.

雷震, 吴莹莹, 路士庆, 杨伯伦. Mass Transfer Modeling in Pervaporation Based on Multi-fields Synergy Theory[J]. , 2008, 16(1): 79-83.

References

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