Modeling permeation of binary mixtures through zeolite membranes

被引:164
作者
van de Graaf, JM [1 ]
Kapteijn, F [1 ]
Moulijn, JA [1 ]
机构
[1] Delft Univ Technol, Waterman Inst Precis Chem Engn, Sect Ind Catalysis, Fac Sci Appl, NL-2628 BL Delft, Netherlands
关键词
D O I
10.1002/aic.690450307
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The separation of ethane/methane and propane/methane mixtures with a silicalite-l membrane was investigated as a function of composition, total hydrocarbon pressure (up to 425 kPa), and temperature (273-373 K). The selectivity of the membrane is highly dependency on these operating conditions. The generalized Maxwell - Stefan Equations were used to predict the fluxes and the associated selectivities. These model predictions, based oil separately determined single-component adsorption and diffusion parameters, were in excellent agreement with the experimental data. Using the empirical Vignes relation for the prediction of the binary Maxwell - Stefan surface diffusivity, there were no fitting parameters involved in the model prediction. The importance of incorporation of adsorbate-adsorbate interactions in the model is clearly shown, body for transient and steady-state mixture permeation, Theoretical analysis showed that for mixtures of a fast, weakly adsorbing component and a slow, strongly adsorbing component the maximum selectivity obtained with microporous membrane separation is always a factor of 2 lower than the one obtained under equilibrium adsorption conditions.
引用
收藏
页码:497 / 511
页数:15
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