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Online NMR spectroscopic study of species distribution in MDEA-H2O-CO2 and MDEA-PIP-H2O-CO2 / Wolfram Bottinger in Industrial & engineering chemistry research, Vol. 47 N°20 (Octobre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7917-7926 Titre : Online NMR spectroscopic study of species distribution in MDEA-H2O-CO2 and MDEA-PIP-H2O-CO2 Type de document : texte imprimé Auteurs : Wolfram Bottinger, Auteur ; Michael Maiwald, Auteur ; Hans Hasse, Auteur Année de publication : 2008 Article en page(s) : P. 7917-7926 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Nuclear  magnetic  resonance(NMR)  Carbon  dioxide  (CO2)  Vapor-liquid  equilibrium  (VLE) Résumé : Quantitative online nuclear magnetic resonance (NMR) spectroscopy was used to study the species distribution in solutions of carbon dioxide (CO2) in aqueous N-methyldiethanolamine (MDEA), and MDEA + piperazine (PIP). The mass fraction of MDEA in the unloaded ternary solution was 0.2, 0.3, and 0.4 g/g. In quaternary solutions, the mass fraction of MDEA was 0.3 g/g, and that of PIP was 0.1 g/g. The temperature ranged from 293 K to 333 K, and the overall CO2 loading was up to 1.4 molCO2/molamine. For the measurements, a special apparatus was used that allowed the mixtures to be prepared gravimetrically and applied pressures up to 25 bar to keep the CO2 in solution. It was coupled to a 400 MHz NMR spectrometer by heated capillaries. Using both 1H and 13C NMR spectroscopy, quantitative information on the concentrations of the following species was obtained: amines, carbamates, bicarbonate, and CO2. Because of the fast proton transfer between molecular and protonated amines, only the sum of their concentrations can be determined. Furthermore, a byproduct was observed and quantified. The experimental data were used to develop a thermodynamic model of the studied electrolyte solutions, based on the extended Pitzer GE-model. In the model development, vapor−liquid equilibrium (VLE) data from the literature also were included. The model describes both the species distribution and the VLE of the studied mixtures. The properties of the quaternary system are predicted from information on the subsystems. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800914m [article] Online NMR spectroscopic study of species distribution in MDEA-H2O-CO2 and MDEA-PIP-H2O-CO2 [texte imprimé] / Wolfram Bottinger, Auteur ; Michael Maiwald, Auteur ; Hans Hasse, Auteur . - 2008 . - P. 7917-7926. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7917-7926 Mots-clés : Nuclear  magnetic  resonance(NMR)  Carbon  dioxide  (CO2)  Vapor-liquid  equilibrium  (VLE) Résumé : Quantitative online nuclear magnetic resonance (NMR) spectroscopy was used to study the species distribution in solutions of carbon dioxide (CO2) in aqueous N-methyldiethanolamine (MDEA), and MDEA + piperazine (PIP). The mass fraction of MDEA in the unloaded ternary solution was 0.2, 0.3, and 0.4 g/g. In quaternary solutions, the mass fraction of MDEA was 0.3 g/g, and that of PIP was 0.1 g/g. The temperature ranged from 293 K to 333 K, and the overall CO2 loading was up to 1.4 molCO2/molamine. For the measurements, a special apparatus was used that allowed the mixtures to be prepared gravimetrically and applied pressures up to 25 bar to keep the CO2 in solution. It was coupled to a 400 MHz NMR spectrometer by heated capillaries. Using both 1H and 13C NMR spectroscopy, quantitative information on the concentrations of the following species was obtained: amines, carbamates, bicarbonate, and CO2. Because of the fast proton transfer between molecular and protonated amines, only the sum of their concentrations can be determined. Furthermore, a byproduct was observed and quantified. The experimental data were used to develop a thermodynamic model of the studied electrolyte solutions, based on the extended Pitzer GE-model. In the model development, vapor−liquid equilibrium (VLE) data from the literature also were included. The model describes both the species distribution and the VLE of the studied mixtures. The properties of the quaternary system are predicted from information on the subsystems. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800914m