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Thermodynamic Study for Gas Absorption in Choline-2-pyrrolidine-carboxylic Acid + Polyethylene Glycol
State Key Laboratory of Materials-Oriented and Chemical Engineering, Nanjing Tech University.
State Key Laboratory of Materials-Oriented and Chemical Engineering, Nanjing Tech University.
State Key Laboratory of Materials-Oriented and Chemical Engineering, Nanjing Tech University.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science. (Energy Engineering)
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Number of Authors: 6
2016 (English)In: Journal of Chemical and Engineering Data, ISSN 0021-9568, E-ISSN 1520-5134, Vol. 61, no 10, 3428-3437 p.Article in journal (Refereed) Published
Abstract [en]

The solubility of pure CO2, CH4, and N2 in the mixture of choline-2-pyrrolidine carboxylic acid ([Cho][Pro]) and polyethylene glycol (PEG200) (mass ratio = 1:2) was measured experimentally at temperatures from 308.15 to 338.15 K and pressures up to 28 bar, in which [Cho][Pro] is an ionic liquid and PEG200 is a cosolvent with the purpose to decrease the viscosity. It was found that [Cho][Pro]/PEG200 showed a good selectivity for CO2/CH4 and CO2/N2 separation. The measured experimental data points from this work and others were further used to estimate the thermodynamic properties including the Henry's law constants for the gases in [Cho][Pro]/PEG200, the equilibrium constant for the reaction between CO2 and [Cho][Pro], the CO2 absorption enthalpy in [Cho][Pro]/PEG200, and so forth. The consistent results of the CO2 absorption enthalpy at infinite dilution prove the reliability of the thermodynamic properties obtained in this work. The thermodynamic properties of [Cho][Pro]/PEG200 were further compared with other three typical absorbents, and the absorption enthalpy is nearly half of that for 30 wt % MEA aqueous solution. At the same time, the theoretical amount of absorbents needed for [Cho][Pro]/PEG200 is much lower than that of H2O scrubbing. This shows that [Cho][Pro]/PEG200 is a promising absorbent

Place, publisher, year, edition, pages
2016. Vol. 61, no 10, 3428-3437 p.
National Category
Engineering and Technology
Research subject
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-59810DOI: 10.1021/acs.jced.6b00323ISI: 000385606900007ScopusID: 2-s2.0-84991644074OAI: oai:DiVA.org:ltu-59810DiVA: diva2:1038427
Note

Validerad; 2016; Nivå 2; 2016-11-09 (andbra)

Available from: 2016-10-18 Created: 2016-10-18 Last updated: 2016-11-11Bibliographically approved

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