Assessing the chemical speciation during CO2 absorption by aqueous amines using in situ FTIR / Gilles Richner in Industrial & engineering chemistry research, Vol. 51 N° 44 (Novembre 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 44 (Novembre 2012) . - pp. 14317-14324 Titre : Assessing the chemical speciation during CO2 absorption by aqueous amines using in situ FTIR Type de document : texte imprimé Auteurs : Gilles Richner, Auteur ; Graeme Puxty, Auteur Année de publication : 2013 Article en page(s) : pp. 14317-14324 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : In situ Gas absorption Carbon dioxide Speciation Résumé : During amine scrubbing of CO2 from flue gas, carbamate and bicarbonate species are formed, the amount of which is directly related to the process performance. In this study we present a fast calibration-free spectroscopic technique for determining the speciation of CO2―H2O―alkanolamine systems and in turn the amine protonation and carbamate thermodynamic equilibrium constants. The method is based on in situ infrared monitoring of the liquid phase during CO2 absorption by an aqueous amine solution in a stirred vessel, combined with mathematical hard modeling of the reaction mechanism. The species concentrations are calculated by fitting of a thermodynamic model to multivariate spectroscopic measurements using nonlinear regression. Successful applications include the determination of the amine protonation and carbamate equilibrium constants of one primary (MEA), one secondary (DEA), and one sterically hindered primary (AMP) amine at 40 °C. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26620344 [article] Assessing the chemical speciation during CO2 absorption by aqueous amines using in situ FTIR [texte imprimé] / Gilles Richner, Auteur ; Graeme Puxty, Auteur . - 2013 . - pp. 14317-14324. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 44 (Novembre 2012) . - pp. 14317-14324 Mots-clés : In situ Gas absorption Carbon dioxide Speciation Résumé : During amine scrubbing of CO2 from flue gas, carbamate and bicarbonate species are formed, the amount of which is directly related to the process performance. In this study we present a fast calibration-free spectroscopic technique for determining the speciation of CO2―H2O―alkanolamine systems and in turn the amine protonation and carbamate thermodynamic equilibrium constants. The method is based on in situ infrared monitoring of the liquid phase during CO2 absorption by an aqueous amine solution in a stirred vessel, combined with mathematical hard modeling of the reaction mechanism. The species concentrations are calculated by fitting of a thermodynamic model to multivariate spectroscopic measurements using nonlinear regression. Successful applications include the determination of the amine protonation and carbamate equilibrium constants of one primary (MEA), one secondary (DEA), and one sterically hindered primary (AMP) amine at 40 °C. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26620344

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