http://www.cnr.it/ontology/cnr/individuo/prodotto/ID16878
A 13C NMR study of the carbon dioxide absorption and desorption equilibria by aqueous 2-aminoethanol and N-methyl-substituted 2-aminoethanol (Articolo in rivista)
- Type
- Label
- A 13C NMR study of the carbon dioxide absorption and desorption equilibria by aqueous 2-aminoethanol and N-methyl-substituted 2-aminoethanol (Articolo in rivista) (literal)
- Anno
- 2009-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1039/b814670e (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Mani Fabrizio; Peruzzini Maurizio; Barzagli Francesco (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Mani F., Barzagli F. University of Florence, Department of Chemistry, via della Lastruccia, 3,
50019 Sesto Fiorentino, Firenze
Peruzzini M. ICCOM CNR, via Madonna del Piano, 10, 50019 Sesto Fiorentino, Firenze, Italy (literal)
- Titolo
- A 13C NMR study of the carbon dioxide absorption and desorption equilibria by aqueous 2-aminoethanol and N-methyl-substituted 2-aminoethanol (literal)
- Abstract
- The 13C NMR experimental study presented investigates the absorption of CO2 by a series of primary,
secondary and tertiary alkanolamines in aqueous solution. The absorption experiments were made at
room temperature with four different amine concentrations in the range 0.167-0.667 M (1.01-5.88
wt%). As inferred by 13C NMR spectral analysis, the formation of carbamate increases with increasing
amine concentration following the order secondary amine < primary amine. Moreover, it has been
shown that carbamate reduces the CO2 absorption efficiency. A considerable physical absorption
(10-20%) contributes to the loading capacity of the amines and partially compensates for the yield of
chemical capture, which turned out to be poorer than was expected theoretically. Quite unexpectedly,
carbamate was also produced by an endothermic reaction during the thermal CO2 desorption process
which regenerated the amines (primary and secondary amines). In the case of the secondary amine
2-(methylamino)ethanol (MMEA), the amount of carbamate at the end of the desorption process is
greater than the amount found at the end of the absorption step, thus reducing the desorption efficiency
of the secondary amine in comparison to both primary and tertiary amines. Five cycles of absorption-
desorption tests were carried out to verify the feasibility of regenerated amines for reuse. Our results
indicate that absorption efficiency and loading capacity of the regenerated amine solutions remain
essentially constant during the second to the fifth absorption-desorption experiments, but they both
decrease slightly when compared to the initial amine. (literal)
- Carbon dioxide capture and sequestration (CCS) is of paramount importance to help control global climate changes due to
anthropic CO2 emissions in the atmosphere. Alkanolamines are currently applied on industrial scale for CO2 uptake. In order to
maximize the efficiency of the capture and to reduce the energy demand of the process, it is mandatory to rationalise the reactions
occurring in both absorption and desorption processes. We apply 13C NMR spectroscopy to quantify the chemical species produced
in the CO2/amine/H2O system. As a result of this study, we demonstrate that the formation of primary and secondary amine
carbamates, in both absorption and desorption CCS steps, reduces their CO2 loading capacity and desorption efficiency in
comparison to those of tertiary amines that can not give any carbamate. Such an effect is only partially balanced by a significant
physical CO2 uptake. (literal)
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