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Temperature pressure permeability equation of gas separation in inorganic membrane and its application on adsorption

Authors： Li Dong, Hao Jingyuan

Units： (Xian Siyuan University, Energy & Chemical Engineering Research Center, Xian, 710038)

KeyWords： gas separation; temperature; pressure; gas permeability; coalbed methane; adsorption

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2018,38(4):127-131

Abstract：

Considering the Knudsen diffusion and surface diffusion, a modified diffusion equation for gas permeation through microporous media was obtained theoretically as a function of both temperature and pressure. The diffusion equation contains four parameters (A, B, ? and ?) with physical meaning. A and B reveal the properties of inorganic membrane. The pressure effect ? on the surface diffusion stems from the adsorbate concentration. The temperature effect ? is related to the relative energy difference between the minimum potential energy and the activation energy for an adsorbed molecule. There are high degrees of similarity between inorganic membrane gas separation and coal seam gas adsorption. A temperature-pressure-adsorption equation was, therefore, evolved with the same mathematical formula and four parameters. The Langmuir series isothermal adsorption data of Songzao 8# coal seam are used to verify the applicability of temperature-pressure-adsorption equation. Both the average relative deviation calculation method and the mapping method verify the applicability.

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AuthorIntro：

第一作者简介：李东（1953-），男，美籍华人，美国辛辛那提大学博士学位,教授，主要从事化工工艺与装备，精细化工，聚合物的制备和应用研究.

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