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Thermodynamic study on carbon dioxide absorption in aqueous solutions of choline-based amino acid ionic liquids
Key Laboratory of Material-Oriented and Chemical Engineering, Nanjing Tech University.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science. Key Laboratory of Material and Chemical Engineering, Nanjing Tech University, Nanjing .
Key Laboratory of Material and Chemical Engineering, Nanjing Tech University, Nanjing .
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0002-0200-9960
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2018 (English)In: Separation and Purification Technology, ISSN 1383-5866, E-ISSN 1873-3794Article in journal (Refereed) Epub ahead of print
Abstract [en]

Five choline-based amino acid ionic liquids ([Cho][AA]s) are prepared by neutralization between choline hydroxide and amino acids with different molecular weight and alkalinity. Solubility of CO2 in 30 wt% aqueous solutions of these five [Cho][AA]s has been measured at temperatures from 303.15 to 333.15 K and pressures up to 7 bar. Based on the zwitterion mechanism, the solubility of CO2 in aqueous [Cho][AA]s solutions is correlated with a reaction equilibrium thermodynamic model (RETM). The corresponding thermodynamic parameters, such as Henry’s law constants, reaction equilibrium constants, and enthalpy of physical dissolution and chemical reaction are all calculated and compared to evaluate the CO2 absorption performance in aqueous solutions of five [Cho][AA]s. Meanwhile, the recyclability of the aqueous solution with 30 wt% [Cho][Lys] has been also investigated.

Place, publisher, year, edition, pages
Elsevier, 2018.
National Category
Energy Engineering
Research subject
Energy Engineering
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URN: urn:nbn:se:ltu:diva-67988DOI: 10.1016/j.seppur.2018.01.058OAI: oai:DiVA.org:ltu-67988DiVA, id: diva2:1191406
Available from: 2018-03-19 Created: 2018-03-19 Last updated: 2018-03-19

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