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首页> 外文期刊>Separation and Purification Technology >Investigation of slowing-down and speeding-up effects in binary mixture permeation across SAPO-34 and MFI membranes
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Investigation of slowing-down and speeding-up effects in binary mixture permeation across SAPO-34 and MFI membranes

机译：研究二元混合物透过SAPO-34和MFI膜时的减慢和加速作用

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摘要

Permeation experiments for Ar/CH4 and CO2/H2 mixtures across a SAPO-34 membrane were performed with the objective of highlighting their distinct diffusion characteristics. For the Ar/CH4 mixture, the effective transport coefficients of the individual components in the mixture were found to be practically the same as those obtained from unary permeation experiments, when compared at the same total loading at the upstream face of the membrane. There is no speeding-up of the tardier CH4. Only at the high loadings is there evidence of a small, about 10%, slowing-down of the more mobile Ar. A different picture emerges for permeation of CO2/H2 mixtures across SAPO-34 membrane. While the transport coefficient of CO2 is practically identical to those obtained from unary experiments, there is a significant slowing-down of the more mobile H2. At the highest loading, the transport coefficient of H2 is about a third of the value of the pure component. Permeation of CO2/CH4 mixtures across an MFI membrane showed that there is a significant slowing-down of the more mobile CH4 with concomitant speeding-up of the tardier CO2. The incorporation of the Vignes interpolation formula for the exchange coefficient D_(12) in the Maxwell-Stefan equations does not adequately reflect the slowing-down and speeding-up phenomena for either SAPO-34 or MFI membranes.
机译：为了突出Ar / CH4和CO2 / H2混合物在SAPO-34膜上的扩散特性，进行了渗透实验。对于Ar / CH4混合物，当在膜的上游面上以相同的总负载进行比较时，发现混合物中各个成分的有效传输系数与一元渗透实验所得的传输系数实际上相同。迟滞CH4没有加速。只有在高负荷下，才有迹象表明移动性较弱的Ar会减小约10％。对于穿过SAPO-34膜的CO2 / H2混合物的渗透，出现了另一幅图。尽管CO2的传输系数实际上与一元实验获得的系数相同，但流动性更高的H2的速度明显降低。在最高负载下，H2的传输系数约为纯组分值的三分之一。穿过MFI膜的CO2 / CH4混合物的渗透表明，流动性更强的CH4显着减慢，同时较迟的CO2加速。在Maxwell-Stefan方程中将交换系数D_（12）的Vignes内插公式并入不足以反映SAPO-34或MFI膜的减慢和加速现象。

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