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Mass‐Transfer Rate Enhancement for CO2 Separation by Ionic Liquids: Theoretical Study on the Mechanism
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0002-0200-9960
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology.
State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology, College of Chemistry and Chemical Engineering, Nanjing University of Technology.
2015 (English)In: AIChE Journal, ISSN 0001-1541, E-ISSN 1547-5905, Vol. 61, no 12, p. 4437-4444Article in journal (Refereed) Published
Abstract [en]

To promote the development of ionic liquid (IL) immobilized sorbents and supported IL membranes (SILMs) for CO2 separation, the kinetics of CO2 absorption/desorption in IL immobilized sorbents was studied using a novel method based on nonequilibrium thermodynamics. It shows that the apparent chemical-potential-based mass-transfer coefficients of CO2 were in three regions with three-order difference in magnitude for the IL-film thicknesses in microscale, 100 nm-scale, and 10 nm-scale. Using a diffusion-reaction theory, it is found that by tailoring the IL-film thickness from microscale to nanoscale, the process was altered from diffusion-control to reaction-control, revealing the inherent mechanism for the dramatic rate enhancement. The extension to SILMs shows that the significant improvement of CO2 flux can be obtained theoretically for the membranes with nanoscale IL-films, which makes it feasible to implement CO2 separation by ILs with low investment cost

Place, publisher, year, edition, pages
2015. Vol. 61, no 12, p. 4437-4444
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-5757DOI: 10.1002/aic.14932ISI: 000363775800032Scopus ID: 2-s2.0-84946475255Local ID: 3f0674eb-ebd8-4cc4-971f-eeb722a51fe5OAI: oai:DiVA.org:ltu-5757DiVA, id: diva2:978632
Note
Validerad; 2015; Nivå 2; 20150812 (xiajix)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Ji, Xiaoyan

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