Mass transfer modeling in pervaporation based on multi-fields synergy theory
In order to provide theoretical basis for optimizing the pervaporation procedure, a mass transfer model in pervaporation for binary mixtures was developed based on the multi-fields synergy theory. This model assumed a 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 through the Flory-Huggins thermodynamic theory. The batch experiments and other experiments with a constant composition using a modified chitosan pervaporation membrane to separate tert-butyl alcohol (TBA)-water mixtures, were designed to obtain flux at different operating conditions. The parameters of the mass transfer model were obtained by the flux of the experiments with a constant composition and the activity coefficients available through phase equilibrium 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 agreements with the experiments results.
pervaporation membrane mass transfer model multi-fields synergy theory coupling effect
Yingying Wu Bolun Yang
Department of Chemical Engineering,Xi’an Jiaotong University,Xi’an,Shaanxi 710049,China
国际会议
西安
英文
2007-08-15（万方平台首次上网日期，不代表论文的发表时间）