Modeling Permeation of CO2/CH4, CO2/N2, and N2/CH4 Mixtures Across SAPO-34 Membrane with the Maxwell-Stefan Equations

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• 作者：Shiguang Li ; John L. Falconer ; Richard D. Noble ; R. Krishna
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2007
• 出版时间：June 6, 2007
• 年：2007
• 卷：46
• 期：12
• 页码：3904 - 3911
• 全文大小：590K
• 年卷期：v.46,no.12(June 6, 2007)
• ISSN：1520-5045

文摘

The objective of this paper is test the capability of the Maxwell-Stefan (M-S) diffusion formulation topredict binary mixture permeation fluxes across a SAPO-34 membrane using only data on pure-componentadsorption isotherms and diffusivities. Experiments were carried out for permeation of CO₂/CH₄, CO₂/N₂,and N₂/CH₄ mixtures across a SAPO-34 membrane with upstream pressures ranging to 7.2 MPa, ensuringthat high occupancies within the zeolite layer are reached. Good agreement between the M-S mixture modeland experiments are obtained provided the binary exchange coefficients ₁₂ in the M-S equations are assumedto have high enough values to ensure that intercage hops of the species occur independently of one other.