Mass Transfer Rate Enhancement for CO2 Separation by Ionic Liquids: Effect of Film Thickness

Ionic liquids (ILs) are promising in CO2 separation, while the film thickness is particularly critical for gas transport in these viscous and expensive liquids. In this work, the influence of IL-film thickness on CO2 absorption/desorption of two different IL immobilized sorbents was investigated, in...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 2016-01, Vol.55 (1), p.366-372
Main Authors: Xie, Wenlong, Ji, Xiaoyan, Feng, Xin, Lu, Xiaohua
Format: Article
Language:English
Subjects:
Energiteknik
Energy Engineering
Online Access:Get full text
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Summary:Ionic liquids (ILs) are promising in CO2 separation, while the film thickness is particularly critical for gas transport in these viscous and expensive liquids. In this work, the influence of IL-film thickness on CO2 absorption/desorption of two different IL immobilized sorbents was investigated, in which the results from the thermogravimetric analyzer were further used to estimate the scale of IL-film thickness. It is found that the IL-film in nanoscale is a prerequisite for efficient CO2 absorption/desorption; the equilibrium time can be 10-times different, and the rate constant can be 100-times different for microscale and nanoscale IL-films. This is the first time to quantitatively reveal the influence of IL-film thickness and find out its scale for a significant rate enhancement in the CO2 absorption/desorption by IL immobilized sorbents.
ISSN:0888-5885
1520-5045
1520-5045
DOI:10.1021/acs.iecr.5b03339