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Effect of the CO2-philic ionic liquid [BMIM][Tf2N] on the single and mixed gas transport in PolyActive™ membranes.
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SYSNO ASEP 0532834 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Effect of the CO2-philic ionic liquid [BMIM][Tf2N] on the single and mixed gas transport in PolyActive™ membranes. Author(s) Klepić, M. (CZ)
Fuoco, A. (IT)
Monteleone, M. (IT)
Esposito, E. (IT)
Friess, Karel (UCHP-M)
Izák, Pavel (UCHP-M) RID, ORCID, SAI
Jansen, J.C. (IT)Article number 117813 Source Title Separation and Purification Technology. - : Elsevier - ISSN 1383-5866
Roč. 256, FEB 1 (2021)Number of pages 10 s. Language eng - English Country GB - United Kingdom Keywords gas separation membranes ; ionid liquid ; solution-diffusion mechanism Subject RIV CI - Industrial Chemistry, Chemical Engineering OECD category Chemical process engineering R&D Projects GA18-05484S GA ČR - Czech Science Foundation (CSF) EF16_026/0008413 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support UCHP-M - RVO:67985858 UT WOS 000674616800008 EID SCOPUS 85092407012 DOI 10.1016/j.seppur.2020.117813 Annotation This study reports on the gas transport properties of four different grades of PolyActive™ polyether-co-polyester multi-block copolymer membranes containing different concentrations (4.8, 9.1, 16.7, 23.1 and 28.6 wt%) of the low-viscous CO2-philic ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMIM][Tf2N]). Single gas permeability, solubility and diffusion coefficients of He, H2, N2, O2, CH4 and CO2 were determined at 1 bar and 25 °C in a constant-volume time lag setup. Mixed gas permeability measurements of CO2/CH4 and CO2/N2 mixtures containing 35 and 15 vol% CO2, respectively, were carried out at 25 °C in the pressure range from 1 to 6 bar(a). The transport properties were correlated with the ionic liquid content of the samples, the specific PolyActive™ grade (i.e. chain length, copolymer composition), and previously determined microstructure, crystallinity, thermal and mechanical properties. For all PolyActive™ grades, the single gas permeability decreased in the order CO2 ≫ H2 > He > O2 ≈ CH4 > N2 and it typically increased with increasing IL content, whereas the ideal selectivity decreased with IL content for most gas pairs. None of the membranes revealed significant dependence on the feed pressure in both single and mixed gas permeation tests. Such behavior is typical for predominantly rubber-like materials. Samples based on PolyActive™ 4000PEOT77PBT23 had the strongest dependence on the IL concentration due to its higher weight fraction and higher crystallinity of the polyether phase.The specific behavior of the four polymers was illustrated via their different trends with increasing IL concentration in the Robeson diagrams. The study demonstrates how blending with ionic liquid can be used to tailor the permeability and selectivity of the membranes. It provides insight into the influence of ionic liquid and the weight percentages of the PEO blocks and the PBT blocks in the copolymers on the individual contributions of the solubility and diffusion coefficients on the permeability. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2022 Electronic address http://hdl.handle.net/11104/0311817
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