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Improved CO2 separation performance of aqueous choline-glycine solution by partially replacing water with polyethylene glycol
Key Laboratory of Material and Chemical Engineering, Nanjing Tech University, Nanjing, China.
Key Laboratory of Material and Chemical Engineering, Nanjing Tech University, Nanjing, China.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science. Key Laboratory of Material and Chemical Engineering, Nanjing Tech University, Nanjing, China.
Key Laboratory of Material and Chemical Engineering, Nanjing Tech University, Nanjing, China.
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2019 (English)In: Fluid Phase Equilibria, ISSN 0378-3812, E-ISSN 1879-0224, Vol. 495, p. 12-20Article in journal (Refereed) Published
Abstract [en]

Aqueous choline-glycine ([Cho][Gly]) solution is a potential candidate for CO2separation owing to its excellent absorption performance and biodegradability. Moreover, the aqueous solution is easy to volatilize at high temperatures. In this work, H2O was partially replaced with polyethylene glycol (PEG200) and the effect of PEG200 on the CO2 separation performance in [Cho][Gly])/H2O was investigated. The viscosity of [Cho][Gly]/H2O/PEG200 and CO2 solubility in the solution were determined experimentally in the temperature range 308.15–338.15 K at pressures ≤6.5 bar. Further, the measured CO2 solubility was fitted with the reaction equilibrium thermodynamic model and the CO2 desorption enthalpy was estimated. The regeneration performance of [Cho][Gly]/H2O/PEG200 was also evaluated. The results revealed that [Cho][Gly]/H2O/PEG200 has a low CO2desorption enthalpy and high regeneration efficiency. Particularly, [Cho][Gly]/H2O/PEG200 with 30 wt% PEG200 has a high regeneration efficiency of 95%. Owing to its physical-chemical properties and CO2 separation performance, [Cho][Gly]/H2O/PEG200 shows great potential as an absorbent for CO2 separation.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 495, p. 12-20
Keywords [en]
Ionic liquids, Carbon dioxide, Solubility, Reaction equilibrium thermodynamic model, Regeneration
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-73942DOI: 10.1016/j.fluid.2019.05.006ISI: 000473379400002Scopus ID: 2-s2.0-85065612653OAI: oai:DiVA.org:ltu-73942DiVA, id: diva2:1315924
Note

Validerad;2019;Nivå 2;2019-06-11 (oliekm)

Available from: 2019-05-15 Created: 2019-05-15 Last updated: 2019-08-15Bibliographically approved

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Chen, YifengJi, Xiaoyan

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