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Dynamic modeling and simulation of ozonation in a semibatch bubble column reactor / Masahiro Tokumura in Industrial & engineering chemistry research, Vol. 48 N° 17 (Septembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 17 (Septembre 2009) . - pp. 7965–7975 Titre : Dynamic modeling and simulation of ozonation in a semibatch bubble column reactor : decolorization and mineralization of azo dye orange II by ozone Type de document : texte imprimé Auteurs : Masahiro Tokumura, Auteur ; Takashi Katoh, Auteur ; Hiroki Ohata, Auteur Année de publication : 2009 Article en page(s) : pp. 7965–7975 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Ozone  decolorization  Azo  dye  Orange  II  Mineralization  Rate-based  model  Chemical  reaction  Gas−liquid  mass  transfer Résumé : Ozone decolorization and mineralization of azo dye Orange II were examined. In order to elucidate the dynamics of the oxidation process by ozone, the rate-based model consisting of the rates of chemical reaction and gas−liquid mass transfer was developed. The overall enhancement factor was introduced to correct the underestimation of mass transfer driving force for fast reactions. In modeling, nonideal mixing characteristics in the gas and liquid phases were described using a tanks-in-series model with backflow. The parameters in the proposed mixing model were determined on the basis of a multiple circulation cell model and a velocity profile of recirculatory flow in a bubble column. Experiments for decolorization and mineralization of Orange II were performed to verify the capability of the proposed model in a semibatch bubble column. The decolorization completed rather quickly. However, the mineralization characterized by the total organic carbon (TOC) was incomplete and its rate was rather slow. It was found that the decolorization rate decreased with the increase in the initial Orange II concentration and increased with increasing ozone gas injection rate, ozone dosage, and solution pH. The proposed model could reasonably describe the present experimental results for the dynamic changes and the steady state of decolorization, mineralization, dissolved ozone concentration, and ozone concentration in the outlet gas. The proposed model might effectively handle the prediction of ozone oxidation process in a semibatch bubble column. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie802009j [article] Dynamic modeling and simulation of ozonation in a semibatch bubble column reactor : decolorization and mineralization of azo dye orange II by ozone [texte imprimé] / Masahiro Tokumura, Auteur ; Takashi Katoh, Auteur ; Hiroki Ohata, Auteur . - 2009 . - pp. 7965–7975. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 17 (Septembre 2009) . - pp. 7965–7975 Mots-clés : Ozone  decolorization  Azo  dye  Orange  II  Mineralization  Rate-based  model  Chemical  reaction  Gas−liquid  mass  transfer Résumé : Ozone decolorization and mineralization of azo dye Orange II were examined. In order to elucidate the dynamics of the oxidation process by ozone, the rate-based model consisting of the rates of chemical reaction and gas−liquid mass transfer was developed. The overall enhancement factor was introduced to correct the underestimation of mass transfer driving force for fast reactions. In modeling, nonideal mixing characteristics in the gas and liquid phases were described using a tanks-in-series model with backflow. The parameters in the proposed mixing model were determined on the basis of a multiple circulation cell model and a velocity profile of recirculatory flow in a bubble column. Experiments for decolorization and mineralization of Orange II were performed to verify the capability of the proposed model in a semibatch bubble column. The decolorization completed rather quickly. However, the mineralization characterized by the total organic carbon (TOC) was incomplete and its rate was rather slow. It was found that the decolorization rate decreased with the increase in the initial Orange II concentration and increased with increasing ozone gas injection rate, ozone dosage, and solution pH. The proposed model could reasonably describe the present experimental results for the dynamic changes and the steady state of decolorization, mineralization, dissolved ozone concentration, and ozone concentration in the outlet gas. The proposed model might effectively handle the prediction of ozone oxidation process in a semibatch bubble column. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie802009j