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The characterization of CO_2 permeation in a CMSM derived from polyimide

机译：聚酰亚胺衍生的CMSM中CO_2渗透的表征

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Carbon molecular sieve membrane (CMSM) is prepared from Kapton polyimide. The CMSM presents strong molecular sieving effect for gas molecules with different dimensions. CO_2 sorption and permeation experiments were performed on the CMSM over a wide pressure range (up to 40 atm). The permeation time lag and steady state permeation flux were employed to characterize the concentration dependence of the diffusion coefficient of the adsorbate. A new functional form is proposed for the cocnentration dependence of the surface diffusivity [D_(mu)(C)/D_(mu)~0 = 1/(1-thetha)~n, where theta is the ratio of surface coverage and n > = 1] to cope with the experimental observations. With the sorption-diffusion mechanmism, both transient time lag and steady state flux indicates that the surface diffusivity of CO_2 takes a concentration dependence much stronger than that described by the traditional HIO model, [i.e. D_(mu)(C)/D_(mu)~0 = 1/(1-theta)]. The reason for this abnormality is discussed.
机译：碳分子筛膜（CMSM）由Kapton聚酰亚胺制备。 CMSM对不同尺寸的气体分子具有很强的分子筛作用。在较宽的压力范围（最高40个大气压）上对CMSM进行了CO_2吸附和渗透实验。利用渗透时滞和稳态渗透通量来表征吸附物扩散系数的浓度依赖性。提出了一种新的函数形式来表示表面扩散率的相关性[D_（μ）（C）/ D_（μ）〜0 = 1 /（1-thetha）〜n，其中θ是表面覆盖率与n的比值> = 1]以应付实验观察。利用吸附-扩散机理，瞬态时间滞后和稳态通量都表明，CO_2的表面扩散对浓度的依赖性要强于传统HIO模型所描述的浓度依赖性。 D_μ（C）/D_μ〜0 ＝ 1 /（1-θ）]。讨论了这种异常的原因。

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