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Rapid desorption of CO2 from deep eutectic solvents based on polyamines at lower temperatures: an alternative technology with industrial potential
Umeå University, Faculty of Science and Technology, Department of Chemistry.ORCID iD: 0000-0003-4097-3504
Umeå University, Faculty of Science and Technology, Department of Chemistry.ORCID iD: 0000-0003-1901-6961
Umeå University, Faculty of Science and Technology, Department of Chemistry. Industrial Chemistry & Reaction Engineering, Department of Chemical Engineering, Johan Gadolin Process Chemistry Centre, Åbo Akademi University, Åbo-Turku, Finland.
2019 (English)In: Sustainable Energy & Fuels, ISSN 2398-4902, Vol. 3, no 8, p. 2125-2134Article in journal (Refereed) Published
Abstract [en]

Herein we developed a new family of polyamine-based deep eutectic solvents (DESs) dedicated to reduce the energy consumption, avoiding the formation of hazardous molecules, aiming at low solvent losses and robust desorption efficiency for carbon dioxide (CO 2) capture technology. The strategy developed for economical, thermally stable and low viscous absorbents for CO 2 capture by functionalized neoteric media of azolide anion and secondary amine is presented. The prepared anion functionalized ionic liquids (ILs) and the derived DESs with ethylene glycol (EG) have a low viscosity which promotes high uptake of CO 2 (17-22% w/w) at 298.15 K and 1 atm. The absorption capacity of DESs was determined by a gravimetric technique. 13 C NMR was used for examine the desorption efficiency (DE) of CO 2. It was found that rapid desorption of CO 2 in TEPA polyamine based DESs occurs compared to monoethanolamine at 80 °C. However, the desorption rate of CO 2 was observed to be higher at higher temperatures and, as a result, under nitrogen flow complete desorption of CO 2 took place at 100 and 110 °C after 30 and 20 minutes, respectively. Consequently, comparative regeneration of CO 2 was studied in the absence of nitrogen flow at different temperatures. Excellent reversible uptake of CO 2 was observed without significant loss of absorption capacity under four consecutive cycles at 100 °C. The chemisorption of CO 2 was verified by 13 C NMR, 2D-NMR and FT-IR spectroscopy. The solvent loss study demonstrated the low volatility of polyamines based DESs at 100 °C and 120 °C after 50 hrs. The proposed DESs are thermally stable, cheap and give rise to negligible amounts of hazardous degradation components. Further, they exhibit low solvent losses, low viscosities and rapid CO 2 desorption capability. Therefore they are promising candidates when aiming at improving amine based conventional CO 2 capture technology.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2019. Vol. 3, no 8, p. 2125-2134
National Category
Organic Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-161789DOI: 10.1039/C9SE00112CISI: 000476912900021Scopus ID: 2-s2.0-85069772826OAI: oai:DiVA.org:umu-161789DiVA, id: diva2:1340476
Available from: 2019-08-05 Created: 2019-08-05 Last updated: 2019-08-14Bibliographically approved

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Mukesh, ChandrakantKhokarale, Santosh G.Mikkola, Jyri-Pekka

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