Modeling permeation of binary mixtures through zeolite membranes
作者： Jolinde M. van de Graaf , Freek Kapteijn , Jacob A. Moulijn
关键词: Propane 、 Microporous material 、 Thermodynamics 、 Membrane 、 Adsorption 、 Membrane technology 、 Chromatography 、 Chemistry 、 Permeation 、 Diffusion 、 Thermal diffusivity
摘要: The separation of ethane/methane and propane/methane mixtures with a silicalite-1 membrane was investigated as function composition, total hydrocarbon pressure (up to 425 kPa), temperature (273--373 K). selectivity the is highly dependent on these operating conditions. generalized Maxwell-Stefan equations were used predict fluxes associated selectivities. These model predictions, based separately determined single-component adsorption diffusion parameters, in excellent agreement experimental data. Using empirical Vignes relation for prediction binary surface diffusivity, there no fitting parameters involved prediction. importance incorporation adsorbate-adsorbate interactions clearly shown, both transient steady-state mixture permeation. Theoretical analysis showed that fast, weakly adsorbing component slow, strongly maximum obtained microporous always factor 2 lower than one under equilibrium
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