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Industrial applied and modeling research on selective H2S removal using a rotating packed bed / Zhi Qian in Industrial & engineering chemistry research, Vol. 51 N° 23 (Juin 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 23 (Juin 2012) . - pp. 8108-8116 Titre : Industrial applied and modeling research on selective H2S removal using a rotating packed bed Type de document : texte imprimé Auteurs : Zhi Qian, Auteur ; Zhen-Hu Li, Auteur ; Kai Guo, Auteur Année de publication : 2012 Article en page(s) : pp. 8108-8116 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Packed  bed  Hydrogen  sulfides  Modeling Résumé : For the simultaneous absorption of H2S and CO2 into methyldiethanolamine (MDEA) solution, MDEA in fact is selective toward both H2S and CO2. It is kinetically selective toward H2S and thermodynamically selective toward CO2. Selective H2S removal using a rotating packed bed (RPB) solves the problem that a large amount of CO2 accompanying H2S is simultaneously removed in the conventional desulfurization process. An RPB highlights that MDEA is kinetically selective toward H2S and restricts its thermodynamically selectivity toward CO2. In this work, an industrial test for MDEA selective absorption of H2S was performed. Compared with a conventional tower the RPB has a substantial advantage in selective absorption of H2S. A reaction-equilibrium-mass transfer model based on penetration theory is developed to describe the selective absorption process and the inhibition effect on H2S absorption from the CO2―MDEA reaction in the liquid film. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25990323 [article] Industrial applied and modeling research on selective H2S removal using a rotating packed bed [texte imprimé] / Zhi Qian, Auteur ; Zhen-Hu Li, Auteur ; Kai Guo, Auteur . - 2012 . - pp. 8108-8116. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 23 (Juin 2012) . - pp. 8108-8116 Mots-clés : Packed  bed  Hydrogen  sulfides  Modeling Résumé : For the simultaneous absorption of H2S and CO2 into methyldiethanolamine (MDEA) solution, MDEA in fact is selective toward both H2S and CO2. It is kinetically selective toward H2S and thermodynamically selective toward CO2. Selective H2S removal using a rotating packed bed (RPB) solves the problem that a large amount of CO2 accompanying H2S is simultaneously removed in the conventional desulfurization process. An RPB highlights that MDEA is kinetically selective toward H2S and restricts its thermodynamically selectivity toward CO2. In this work, an industrial test for MDEA selective absorption of H2S was performed. Compared with a conventional tower the RPB has a substantial advantage in selective absorption of H2S. A reaction-equilibrium-mass transfer model based on penetration theory is developed to describe the selective absorption process and the inhibition effect on H2S absorption from the CO2―MDEA reaction in the liquid film. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25990323

Modeling study on absorption of CO2 by aqueous solutions of N-methyldiethanolamine in rotating packed bed / Zhi Qian in Industrial & engineering chemistry research, Vol. 48 N° 20 (Octobre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 20 (Octobre 2009) . - pp. 9261–9267 Titre : Modeling study on absorption of CO2 by aqueous solutions of N-methyldiethanolamine in rotating packed bed Type de document : texte imprimé Auteurs : Zhi Qian, Auteur ; Lianbin Xu, Auteur ; Huibo Cao, Auteur Année de publication : 2010 Article en page(s) : pp. 9261–9267 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : CO2  absorption  N-methyldiethanolamine  Rotating  packed  bed Résumé : The work presents a theoretical investigation of the absorption of CO2 by aqueous solutions of N-methyldiethanolamine (MDEA) in a rotating packed bed (RPB). The diffusion-reaction process for CO2-MDEA mass transfer in RPB is modeled according to Higbie’s penetration theory with the assumption that all reactions are reversible. A three-dimensional distribution of carbon dioxide concentration varying with the time and penetration depth in liquid film and an average mass transfer rate at interface are obtained. The intensification within the RPB is mainly achieved by the sharper concentration profile of the dissolvable gas in liquid film; the short lifetime of liquid film resulting from frequent renewal of the film on packing surface significantly increases the mass transfer coefficient. Experiments were carried out at various rotating speeds, liquid flow rates, and temperatures in RPB. The validity of this model is demonstrated by the fact that most of the predicted yout (mole fraction of CO2 in outlet gas) agree well with the experimental data with a deviation within 4%. Besides, this study makes a quantitative comparison between dynamic- and static-state mass transfer coefficients for this reactive absorption and a discussion on their applicability. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900894a [article] Modeling study on absorption of CO2 by aqueous solutions of N-methyldiethanolamine in rotating packed bed [texte imprimé] / Zhi Qian, Auteur ; Lianbin Xu, Auteur ; Huibo Cao, Auteur . - 2010 . - pp. 9261–9267. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 20 (Octobre 2009) . - pp. 9261–9267 Mots-clés : CO2  absorption  N-methyldiethanolamine  Rotating  packed  bed Résumé : The work presents a theoretical investigation of the absorption of CO2 by aqueous solutions of N-methyldiethanolamine (MDEA) in a rotating packed bed (RPB). The diffusion-reaction process for CO2-MDEA mass transfer in RPB is modeled according to Higbie’s penetration theory with the assumption that all reactions are reversible. A three-dimensional distribution of carbon dioxide concentration varying with the time and penetration depth in liquid film and an average mass transfer rate at interface are obtained. The intensification within the RPB is mainly achieved by the sharper concentration profile of the dissolvable gas in liquid film; the short lifetime of liquid film resulting from frequent renewal of the film on packing surface significantly increases the mass transfer coefficient. Experiments were carried out at various rotating speeds, liquid flow rates, and temperatures in RPB. The validity of this model is demonstrated by the fact that most of the predicted yout (mole fraction of CO2 in outlet gas) agree well with the experimental data with a deviation within 4%. Besides, this study makes a quantitative comparison between dynamic- and static-state mass transfer coefficients for this reactive absorption and a discussion on their applicability. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900894a

Selective absorption of H2S from a gas mixture with CO2 by aqueous N-methyldiethanolamine in a rotating packed bed / Zhi Qian in Industrial & engineering chemistry research, Vol. 49 N° 13 (Juillet 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 13 (Juillet 2010) . - pp. 6196–6203 Titre : Selective absorption of H2S from a gas mixture with CO2 by aqueous N-methyldiethanolamine in a rotating packed bed Type de document : texte imprimé Auteurs : Zhi Qian, Auteur ; Lian-Bin Xu, Auteur ; Zhen-Hu Li, Auteur Année de publication : 2010 Article en page(s) : pp. 6196–6203 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : H2S  CO2  N-methyldiethanolamine Résumé : In this work, selective absorption of H2S from a gas mixture with CO2 into N-methyldiethanolamine (MDEA) is investigated experimentally and theoretically in a rotating packed bed (RPB). In the RPB, various rotating speeds, gas flow rates, liquid flow rates, and concentrations of MDEA aqueous solutions were studied by means of the evaluation of removal efficiency, selectivity, and overall volumetric mass transfer coefficient. The reaction−diffusion mass transfer model based on penetration theory for the selective absorption process is developed, accordingly. The results of experiment and model show that the uppermost function of RPB in selective absorption of H2S is to restrain the CO2 removal efficiency but sharply intensify the absorption of H2S. The mass transfer coefficient of CO2 absorption is enhanced in RPB. However, the total amount of CO2 mass transfer virtually is low because of the short gas−liquid contact time, small volume of packing, and large gas−liquid ratio within the RPB, and the CO2 removal efficiency is merely around 9.50%. For the penetration of H2S into liquid film, it is just 2.0 × 10−9 s that H2S needs to be exhausted at 10−8 m into the liquid film. And the lifetime of a liquid film in the RPB is 7 orders of magnitude bigger than this penetration time of H2S. So the reaction and mass transfer of H2S still can be completed even at the very short gas−liquid contact time within the RPB, and a high H2S removal efficiency of around 99.76% also can be achieved. In addition, a quantitative analysis based on the model, which suggests that the existence of CO2 has little effect on the absorption of H2S while the H2S has an apparent negative impact on the absorption of CO2, can be obtained for the selective absorption process. The experimental and model results have been found to be in a good agreement. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100678c [article] Selective absorption of H2S from a gas mixture with CO2 by aqueous N-methyldiethanolamine in a rotating packed bed [texte imprimé] / Zhi Qian, Auteur ; Lian-Bin Xu, Auteur ; Zhen-Hu Li, Auteur . - 2010 . - pp. 6196–6203. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 13 (Juillet 2010) . - pp. 6196–6203 Mots-clés : H2S  CO2  N-methyldiethanolamine Résumé : In this work, selective absorption of H2S from a gas mixture with CO2 into N-methyldiethanolamine (MDEA) is investigated experimentally and theoretically in a rotating packed bed (RPB). In the RPB, various rotating speeds, gas flow rates, liquid flow rates, and concentrations of MDEA aqueous solutions were studied by means of the evaluation of removal efficiency, selectivity, and overall volumetric mass transfer coefficient. The reaction−diffusion mass transfer model based on penetration theory for the selective absorption process is developed, accordingly. The results of experiment and model show that the uppermost function of RPB in selective absorption of H2S is to restrain the CO2 removal efficiency but sharply intensify the absorption of H2S. The mass transfer coefficient of CO2 absorption is enhanced in RPB. However, the total amount of CO2 mass transfer virtually is low because of the short gas−liquid contact time, small volume of packing, and large gas−liquid ratio within the RPB, and the CO2 removal efficiency is merely around 9.50%. For the penetration of H2S into liquid film, it is just 2.0 × 10−9 s that H2S needs to be exhausted at 10−8 m into the liquid film. And the lifetime of a liquid film in the RPB is 7 orders of magnitude bigger than this penetration time of H2S. So the reaction and mass transfer of H2S still can be completed even at the very short gas−liquid contact time within the RPB, and a high H2S removal efficiency of around 99.76% also can be achieved. In addition, a quantitative analysis based on the model, which suggests that the existence of CO2 has little effect on the absorption of H2S while the H2S has an apparent negative impact on the absorption of CO2, can be obtained for the selective absorption process. The experimental and model results have been found to be in a good agreement. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100678c