Absorption of CO2 with supported imidazolium‐based ionic liquid membranes. Issue 8 (15th December 2014)

• Record Type: Journal Article
• Authors: Cao, Baichuan; Yan, Weiheng; Wang, Jin; Ding, Hong; Yu, Yang
• Is Part Of: Journal of chemical technology & biotechnology. Volume 90:Issue 8(2015:Aug.)
• Page Start: 1537
• Page End: 1544
• Publication Date: 2014-12-15
• Subjects: Biotechnology -- Periodicals; Chemistry, Technical -- Periodicals; Chemical engineering -- Periodicals; Industries -- Environmental aspects -- Periodicals; 660
• DOI: 10.1002/jctb.4597
• Languages: English
• ISSNs: 0268-2575

Abstract

<abstract abstract-type="main" id="jctb4597-abs-0001"> <title>Abstract</title> <sec id="jctb4597-sec-0001" sec-type="section"> <title>BACKGROUND</title> <p id="jctb4597-para-0001">Ionic liquids (ILs) are considered to be one of the future solutions to CO<sub>2</sub> emission control because of their high CO<sub>2</sub> solubility. Infiltrating ionic liquids into porous materials to prepare a supported ionic liquid membrane (SILM), could increase the absorption efficiency.</p> </sec> <sec id="jctb4597-sec-0002" sec-type="section"> <title>RESULTS</title> <p id="jctb4597-para-0002">Four SILMs were prepared from imidazolium‐based ILs and PVDF microporous membranes. The CO<sub>2</sub> absorption capacities of the SILMs were in the range of 0.88–3.64 mol mol<sup>−1</sup>, which were much higher than the solubility in ILs. After 20 min desorption at 60 °C or 0.08 MPa negative pressure, desorption rate reached 90%. And under the combined condition of 60 °C and 0.08 MPa, the desorption period was shortened and full desorption was obtained. The renewed SILMs maintained excellent CO<sub>2</sub> absorption performance during several absorption–desorption cycles. A new peak at 1274–1284 cm<sup>−1</sup> on the surface enhanced Raman scattering (SERS) spectra indicated the absorbed CO<sub>2</sub>, and some shifts of typical ILs vibration bands showed some probable structures related to CO<sub>2</sub> absorption.</p> </sec> <sec id="jctb4597-sec-0003" sec-type="section"> <title>CONCLUSION</title> <p id="jctb4597-para-0003">SILMs improved the mass transfer process and resulted in excellent CO<sub>2</sub> 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. © 2014 Society of Chemical Industry</p> </sec> </abstract>