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Absorption of carbon dioxide with ionic liquid in a rotating packed bed contactor / Liang - Liang Zhang in Industrial & engineering chemistry research, Vol. 50 N° 11 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp. 6957-6964 Titre : Absorption of carbon dioxide with ionic liquid in a rotating packed bed contactor : mass transfer study Type de document : texte imprimé Auteurs : Liang - Liang Zhang, Auteur ; Jie - Xin Wang, Auteur ; Yang Xiang, Auteur Année de publication : 2011 Article en page(s) : pp. 6957-6964 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Mass  transfer  Packed  bed  Ionic  liquid  Carbon  dioxide Résumé : Using ionic liquids for CO2 capture is of great interest due to their unique characteristics. However, low gas―liquid mass transfer rates in conventional gas-liquid contactors due to the high viscosities of ionic liquids lead to the significant limitation for large-scale applications of CO2 capture using ionic liquids. Therefore, there is an urgent demand to develop a novel gas―liquid contactor for the intensification of the mass transfer efficiency in such a system. In this article, CO2 absorption with an ionic liquid in a rotating packed bed (RPB) gas-liquid contactor is first reported. It was found that the RPB markedly enhanced the physical absorption of CO2 in the ionic liquid in a very short contact time, within seconds. Only one cycle gas-liquid contact in the RPB could make the saturation ratio of CO2 in the ionic liquid reach 60%. The effects of various operation conditions on the liquid side volumetric mass transfer coefficient (kLα) were elucidated. Increasing the rotating speed from 1100 to 3100 rpm doubled the kLα. The increase of the liquid flow rate also benefited the enhancement of the kLα. The experimentally measured kLα in the RPB is at least 1 order of magnitude higher than that in a conventional packed tower. A model based on penetration theory was proposed to describe the mechanism of gas―liquid mass transfer in the RPB. The predicted kLα was in good agreement with the experimental data with a deviation of less than 15%. The RPB shows great potential for the industrial application of CO2 capture using ionic liquids. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24199914 [article] Absorption of carbon dioxide with ionic liquid in a rotating packed bed contactor : mass transfer study [texte imprimé] / Liang - Liang Zhang, Auteur ; Jie - Xin Wang, Auteur ; Yang Xiang, Auteur . - 2011 . - pp. 6957-6964. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp. 6957-6964 Mots-clés : Mass  transfer  Packed  bed  Ionic  liquid  Carbon  dioxide Résumé : Using ionic liquids for CO2 capture is of great interest due to their unique characteristics. However, low gas―liquid mass transfer rates in conventional gas-liquid contactors due to the high viscosities of ionic liquids lead to the significant limitation for large-scale applications of CO2 capture using ionic liquids. Therefore, there is an urgent demand to develop a novel gas―liquid contactor for the intensification of the mass transfer efficiency in such a system. In this article, CO2 absorption with an ionic liquid in a rotating packed bed (RPB) gas-liquid contactor is first reported. It was found that the RPB markedly enhanced the physical absorption of CO2 in the ionic liquid in a very short contact time, within seconds. Only one cycle gas-liquid contact in the RPB could make the saturation ratio of CO2 in the ionic liquid reach 60%. The effects of various operation conditions on the liquid side volumetric mass transfer coefficient (kLα) were elucidated. Increasing the rotating speed from 1100 to 3100 rpm doubled the kLα. The increase of the liquid flow rate also benefited the enhancement of the kLα. The experimentally measured kLα in the RPB is at least 1 order of magnitude higher than that in a conventional packed tower. A model based on penetration theory was proposed to describe the mechanism of gas―liquid mass transfer in the RPB. The predicted kLα was in good agreement with the experimental data with a deviation of less than 15%. The RPB shows great potential for the industrial application of CO2 capture using ionic liquids. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24199914

CFD analysis of flow patterns and micromixing efficiency in a Y-type microchannel reactor / Xin Shi in Industrial & engineering chemistry research, Vol. 51 N° 43 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 43 (Octobre 2012) . - pp. 13944-13952 Titre : CFD analysis of flow patterns and micromixing efficiency in a Y-type microchannel reactor Type de document : texte imprimé Auteurs : Xin Shi, Auteur ; Yang Xiang, Auteur ; Li-Xiong Wen, Auteur Année de publication : 2013 Article en page(s) : pp. 13944-13952 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Microreactor  Micromixing  Flow  field  Computational  fluid  dynamics Résumé : Micromixing efficiency is a significant performance index of most chemical reactors. In this work, a three-dimensional Computational Fluid Dynamics (CFD) model for a Y-type microchannel reactor has been developed to predict its flow patterns and micromixing efficiency with the iodate-iodide reaction testing system. The effects of Re, volumetric flow ratio (R), and initial concentration of H+ on the micromixing efficiency (represented by the segregation index XS) have been investigated and the visualization of velocity, path lines, and concentration distributions inside the reactor has been demonstrated. It was found that XS decreases with increasing Re, or decreasing R or initial H― concentration. To optimize the microchannel reactor for enhanced mixing performance, the effects of microchannel configuration, such as length of channel, mixing angle, and hydraulic diameters, on micromixing efficiency were studied as well. The results demonstrated that the mixing process mainly occurs in the Y-junction area and extra length of outlet channel has little effect on micromixing efficiency. It also showed that XS depends strongly on the mixing angle and hydraulic diameters of the channels, and the pressure drop within the channel increases significantly with decreasing hydraulic diameters. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26593321 [article] CFD analysis of flow patterns and micromixing efficiency in a Y-type microchannel reactor [texte imprimé] / Xin Shi, Auteur ; Yang Xiang, Auteur ; Li-Xiong Wen, Auteur . - 2013 . - pp. 13944-13952. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 43 (Octobre 2012) . - pp. 13944-13952 Mots-clés : Microreactor  Micromixing  Flow  field  Computational  fluid  dynamics Résumé : Micromixing efficiency is a significant performance index of most chemical reactors. In this work, a three-dimensional Computational Fluid Dynamics (CFD) model for a Y-type microchannel reactor has been developed to predict its flow patterns and micromixing efficiency with the iodate-iodide reaction testing system. The effects of Re, volumetric flow ratio (R), and initial concentration of H+ on the micromixing efficiency (represented by the segregation index XS) have been investigated and the visualization of velocity, path lines, and concentration distributions inside the reactor has been demonstrated. It was found that XS decreases with increasing Re, or decreasing R or initial H― concentration. To optimize the microchannel reactor for enhanced mixing performance, the effects of microchannel configuration, such as length of channel, mixing angle, and hydraulic diameters, on micromixing efficiency were studied as well. The results demonstrated that the mixing process mainly occurs in the Y-junction area and extra length of outlet channel has little effect on micromixing efficiency. It also showed that XS depends strongly on the mixing angle and hydraulic diameters of the channels, and the pressure drop within the channel increases significantly with decreasing hydraulic diameters. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26593321