Continuous cycles of CO2 absorption and amine regeneration with aqueous alkanolamines: a comparison of the efficiency between pure and blended DEA, MDEA and AMP solutions by 13C NMR spectroscopy (Articolo in rivista)

Type
Label
  • Continuous cycles of CO2 absorption and amine regeneration with aqueous alkanolamines: a comparison of the efficiency between pure and blended DEA, MDEA and AMP solutions by 13C NMR spectroscopy (Articolo in rivista) (literal)
Anno
  • 2010-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1039/b924889g (literal)
Alternative label
  • Barzagli Francesco; Mani Fabrizio; Peruzzini Maurizio (2010)
    Continuous cycles of CO2 absorption and amine regeneration with aqueous alkanolamines: a comparison of the efficiency between pure and blended DEA, MDEA and AMP solutions by 13C NMR spectroscopy
    in Energy & environmental science (Print); Royal Society of Chemistry, Cambridge (Regno Unito)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Barzagli Francesco; Mani Fabrizio; Peruzzini Maurizio (literal)
Pagina inizio
  • 772 (literal)
Pagina fine
  • 779 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 3 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • M. Peruzzini, F. Mani, ICCOM CNR, via Madonna del Piano, 10, 50019 Sesto Fiorentino, Firenze, Italy F. Barzagli, F. Mani, University of Florence, Department of Chemistry, via della Lastruccia, 3, 50019 Sesto Fiorentino, Firenze (literal)
Titolo
  • Continuous cycles of CO2 absorption and amine regeneration with aqueous alkanolamines: a comparison of the efficiency between pure and blended DEA, MDEA and AMP solutions by 13C NMR spectroscopy (literal)
Abstract
  • The capture of anthropic CO2 by aqueous alkanolamine solutions is currently considered the most efficient and the relatively least expensive technology for the industrial scale application to help the mitigation of global climate change. In order to improve the efficiency and to lower the energetic demand of this technology, it is of paramount importance to have a better knowledge of the reactions occurring in the CO2/amine/H2O systems during the absorption and desorption processes. We have applied 13C NMR spectroscopy to analyze the species that are formed in continuous cycles of simultaneous CO2 capture and amine regeneration. The features of pure and blended amines have been investigated and the species formed in the absorption and desorption steps are correlated to the amine performances. The results we have obtained allow us to establish which amine achieves either the greatest CO2 absorption efficiency or the greatest amine regeneration capacity. The increased performances of the blended amines as compared to those of the corresponding individual amines are explained on the basis of cooperative effects disclosed by 13C NMR analysis. (literal)
  • This experimental study describes the performances of CO2 capture by aqueous solutions of pure alkanolamines (0.667, 1.33 and 2.00 M) 2,20-iminodiethanol (DEA), N-methyl-2,20-iminodiethanol (MDEA) and 2-amino-2-methy-1-propanol (AMP). The behaviour of some alkanolamine blends (2.00 M) has been also considered. In these experiments the CO2-loaded and the regenerated amine solutions were continuously circulated in a closed system between the absorber (set at 293 K) and the desorber (set at 363, 373 and 363-388 K). The absorption efficiency of the single amines at equilibrium is between 69 and 81% according to the desorber temperature and to the amine concentration. The CO2-amine reaction equilibria have been investigated by 13C NMR spectroscopy, which established the regeneration efficiency and the loading capacity for each single amine experiment. AMP displays the greatest absorption efficiency and MDEA the greatest regeneration efficiency at any amine concentration and desorber temperature. Blended AMP-MDEA and AMP-DEA systems (1/2 and 2/1 molar ratios) significantly enhance the absorption efficiency (in the range 7-14%) with respect to single amines under identical operating conditions. AMP-MDEA blends display better performances than AMP-DEA due to the lower efficiency of DEA carbamate in both CO2 absorption and amine regeneration. Owing to a higher thermal stability, AMP and MDEA solutions surpass DEA, as no degradation product has been detected by 13C NMR analysis after heating AMP and MDEA solutions at 403 K up to fourteen days. (literal)
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