Absorption of CO sub(2) with supported imidazolium-based ionic liquid membranes

BACKGROUND Ionic liquids (ILs) are considered to be one of the future solutions to CO sub(2) emission control because of their high CO sub(2) solubility. Infiltrating ionic liquids into porous materials to prepare a supported ionic liquid membrane (SILM), could increase the absorption efficiency. RE...

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Bibliographic Details
Published in:Journal of chemical technology and biotechnology (1986) 2015-08, Vol.90 (8), p.1537-1544
Main Authors: Cao, Baichuan, Yan, Weiheng, Wang, Jin, Ding, Hong, Yu, Yang
Format: Article
Language:English
Subjects:
Carbon dioxide
Desorption
Ionic liquids
Mass transfer
Membranes
Polyvinylidene fluorides
Raman scattering
Solubility
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Summary:BACKGROUND Ionic liquids (ILs) are considered to be one of the future solutions to CO sub(2) emission control because of their high CO sub(2) solubility. Infiltrating ionic liquids into porous materials to prepare a supported ionic liquid membrane (SILM), could increase the absorption efficiency. RESULTS Four SILMs were prepared from imidazolium-based ILs and PVDF microporous membranes. The CO sub(2) absorption capacities of the SILMs were in the range of 0.88-3.64 mol mol super(-1), which were much higher than the solubility in ILs. After 20 min desorption at 60 degree C or 0.08 MPa negative pressure, desorption rate reached 90%. And under the combined condition of 60 degree C and 0.08 MPa, the desorption period was shortened and full desorption was obtained. The renewed SILMs maintained excellent CO sub(2) absorption performance during several absorption-desorption cycles. A new peak at 1274-1284 cm super(-1) on the surface enhanced Raman scattering (SERS) spectra indicated the absorbed CO sub(2), and some shifts of typical ILs vibration bands showed some probable structures related to CO sub(2) absorption. CONCLUSION SILMs improved the mass transfer process and resulted in excellent CO sub(2) absorption capacity. SILMs performed well in multiple absorption-desorption cycles, and showed great potential for industrial application. SERS is a feasible method for the characterization of SILMs.
ISSN:0268-2575
1097-4660
DOI:10.1002/jctb.4597