The 'ideal selectivity' vs 'true selectivity' for permeation of gas mixture in nanoporous membranes

International Conference on Functional Materials and Chemical Engineering 2017

材料科学;化学工业

He, Zhou^1 ; Wang, Kean^1

Department of Chemical Engineering, Khalifa University of Science and Technology, PO Box 2533, Abu Dhabi, United Arab Emirates^1

关键词: Complicated functions;    Ideal selectivities;    Molecular properties;    Nanoporous carbons;    Nanoporous membrane;    Operation conditions;    Permeation characteristics;    Strong interaction;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/323/1/012002/pdf
DOI  :  10.1088/1757-899X/323/1/012002

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In this study, we proposed and validated a novel and non-destructive experimental technology for measuring the permeation of binary gas mixture in nanoporous membranes. The traditional time lag rig was modified to examine the permeation characteristics of each gas component as well as that of the binary gas mixtures. The difference in boiling points of each species were explored. Binary gas mixtures of CO2/He were permeated through the nanoporous carbon molecular sieve membrane (CMSM). The results showed that, due to the strong interaction among different molecules and with the porous network of the membrane, the measured perm-selectivity or 'true selectivity' of a binary mixture can significantly deviate from the 'ideal selectivity' calculated form the permeation flux of each pure species, and this deviation is a complicated function of the molecular properties and operation conditions.