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Composition analysis of CO2−NH3−H2O system based on raman spectra / Qing Zhao in Industrial & engineering chemistry research, Vol. 50 N° 9 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5316–5325 Titre : Composition analysis of CO2−NH3−H2O system based on raman spectra Type de document : texte imprimé Auteurs : Qing Zhao, Auteur ; Shujuan Wang, Auteur ; Feng Qin, Auteur Année de publication : 2011 Article en page(s) : pp. 5316–5325 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Raman  spectroscopy Résumé : We used Raman spectroscopy to systematically and comprehensively measure the concentrations of the main ion components (NH2COO−, HCO3−, and CO32−) in the CO2−NH3−H2O system for an initial total ammonia concentration [A] = 0.69, 0.88, 1.09, 1.34, 1.60, and 2.10 mol·L−1 and CO2 loading [C]/[A] = 0.18, 0.35, 0.43, 0.50, and 0.67, respectively. The experimental data were processed using two existing theoretical methods, and the analysis on results allowed us to propose a number of improvements based on these theoretical methods. Experimental results show that upon increasing [C]/[A], the ratios of [NH2COO−] and [CO32−] to total carbon decrease linearly, whereas the ratio of [HCO3−] to total carbon increases linearly. The reaction process can be divided into three steps. Considering the impacts of experiment errors, [A] has little effect on the relative composition of the system in the range we studied. Results calculated with a revised theoretical method are in better agreement with the experimental data. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1010178 [article] Composition analysis of CO2−NH3−H2O system based on raman spectra [texte imprimé] / Qing Zhao, Auteur ; Shujuan Wang, Auteur ; Feng Qin, Auteur . - 2011 . - pp. 5316–5325. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5316–5325 Mots-clés : Raman  spectroscopy Résumé : We used Raman spectroscopy to systematically and comprehensively measure the concentrations of the main ion components (NH2COO−, HCO3−, and CO32−) in the CO2−NH3−H2O system for an initial total ammonia concentration [A] = 0.69, 0.88, 1.09, 1.34, 1.60, and 2.10 mol·L−1 and CO2 loading [C]/[A] = 0.18, 0.35, 0.43, 0.50, and 0.67, respectively. The experimental data were processed using two existing theoretical methods, and the analysis on results allowed us to propose a number of improvements based on these theoretical methods. Experimental results show that upon increasing [C]/[A], the ratios of [NH2COO−] and [CO32−] to total carbon decrease linearly, whereas the ratio of [HCO3−] to total carbon increases linearly. The reaction process can be divided into three steps. Considering the impacts of experiment errors, [A] has little effect on the relative composition of the system in the range we studied. Results calculated with a revised theoretical method are in better agreement with the experimental data. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1010178

Study of the heat of absorption of CO2 in aqueous ammonia / Feng Qin in Industrial & engineering chemistry research, Vol. 49 N° 8 (Avril 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3776–3784 Titre : Study of the heat of absorption of CO2 in aqueous ammonia : comparison between experimental data and model predictions Type de document : texte imprimé Auteurs : Feng Qin, Auteur ; Shujuan Wang, Auteur ; Inna Kim, Auteur Année de publication : 2010 Article en page(s) : pp. 3776–3784 Langues : Anglais (eng) Mots-clés : Heat  Absorption  CO2  Aqueous  Ammonia  Experimental  Data  Model Résumé : Differential enthalpies of absorption of CO2 in aqueous ammonia were predicted based on reaction equilibrium constants using the Gibbs−Helmholtz equation. The reaction equilibrium constants were selected from the literature and integrated into an electrolyte-NRTL model and the model proposed by Edwards, in which the interaction parameters were previously and solely fitted from the NH3−CO2−H2O vapor−liquid equilibrium (VLE) data. The heat contributions of the individual reactions were taken into account in the total heat of absorption in both of the models. The heat of absorption was presented as a function of the CO2 loading and temperature. The predicted heats of absorption were compared with experimental data for temperatures ranging from 35 to 80 °C obtained in this work and also some other modeling results. The predicted results fit the experimental data well at lower temperatures, and also well at lower loadings when the temperature was higher, but the model was not good at high loadings and high temperature. The paper suggested that the heat of absorption data should also be included when parameters were fit together with VLE data in order to predict the heat of absorption well over a wide range of temperatures and loadings. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901869j [article] Study of the heat of absorption of CO2 in aqueous ammonia : comparison between experimental data and model predictions [texte imprimé] / Feng Qin, Auteur ; Shujuan Wang, Auteur ; Inna Kim, Auteur . - 2010 . - pp. 3776–3784. Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3776–3784 Mots-clés : Heat  Absorption  CO2  Aqueous  Ammonia  Experimental  Data  Model Résumé : Differential enthalpies of absorption of CO2 in aqueous ammonia were predicted based on reaction equilibrium constants using the Gibbs−Helmholtz equation. The reaction equilibrium constants were selected from the literature and integrated into an electrolyte-NRTL model and the model proposed by Edwards, in which the interaction parameters were previously and solely fitted from the NH3−CO2−H2O vapor−liquid equilibrium (VLE) data. The heat contributions of the individual reactions were taken into account in the total heat of absorption in both of the models. The heat of absorption was presented as a function of the CO2 loading and temperature. The predicted heats of absorption were compared with experimental data for temperatures ranging from 35 to 80 °C obtained in this work and also some other modeling results. The predicted results fit the experimental data well at lower temperatures, and also well at lower loadings when the temperature was higher, but the model was not good at high loadings and high temperature. The paper suggested that the heat of absorption data should also be included when parameters were fit together with VLE data in order to predict the heat of absorption well over a wide range of temperatures and loadings. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901869j