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A CFD modeling approach to design a new gas barrier in a multizone circulating polymerization reactor / Wei-Cheng Yan in Industrial & engineering chemistry research, Vol. 51 N° 46 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 46 (Novembre 2012) . - pp. 15132-15144 Titre : A CFD modeling approach to design a new gas barrier in a multizone circulating polymerization reactor Type de document : texte imprimé Auteurs : Wei-Cheng Yan, Auteur ; Guo-Qiang Chen, Auteur ; Zheng-Hong Luo, Auteur Année de publication : 2013 Article en page(s) : pp. 15132-15144 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Polymerization  reactor  Design  ModelingComputational  fluid  dynamics Résumé : In this work, the CFD modeling approach, which is an old approach in chemical engineering, is extended to the propylene polymerization process in a multizone circulating reactor (MZCR) in order to design a new gas-barrier system in the MZCR from the fluid-dynamics viewpoint. First, the CFD modeling approach based on an Eulerian-Eulerian model, incorporating a kinetic theory of granular flow, is applied to describe the gas―solid flow in a polypropylene MZCR. Furthermore, the modeling approach is used to obtain important operation data of the gas-barrier inlet and to optimize the gas-barrier inlet configuration. Accordingly, the entire field in the MZCR with the optimal gas-barrier system above is predicted. The simulation results show that the four-way tangential gas-barrier configuration is suitable in the MZCR, which is the first use of a gas-barrier inlet that allows an optimal flow field in the MZCR. This article has reported an old approach in chemical engineering that has been applied to a new field for the purpose of designing a new gas barrier, which opens up a new research field in the olefin polymerization process. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679632 [article] A CFD modeling approach to design a new gas barrier in a multizone circulating polymerization reactor [texte imprimé] / Wei-Cheng Yan, Auteur ; Guo-Qiang Chen, Auteur ; Zheng-Hong Luo, Auteur . - 2013 . - pp. 15132-15144. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 46 (Novembre 2012) . - pp. 15132-15144 Mots-clés : Polymerization  reactor  Design  ModelingComputational  fluid  dynamics Résumé : In this work, the CFD modeling approach, which is an old approach in chemical engineering, is extended to the propylene polymerization process in a multizone circulating reactor (MZCR) in order to design a new gas-barrier system in the MZCR from the fluid-dynamics viewpoint. First, the CFD modeling approach based on an Eulerian-Eulerian model, incorporating a kinetic theory of granular flow, is applied to describe the gas―solid flow in a polypropylene MZCR. Furthermore, the modeling approach is used to obtain important operation data of the gas-barrier inlet and to optimize the gas-barrier inlet configuration. Accordingly, the entire field in the MZCR with the optimal gas-barrier system above is predicted. The simulation results show that the four-way tangential gas-barrier configuration is suitable in the MZCR, which is the first use of a gas-barrier inlet that allows an optimal flow field in the MZCR. This article has reported an old approach in chemical engineering that has been applied to a new field for the purpose of designing a new gas barrier, which opens up a new research field in the olefin polymerization process. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679632

Design of a reactive distillation column for direct preparation of dichloropropanol from glycerol / Zheng-Hong Luo in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10779–10787 Titre : Design of a reactive distillation column for direct preparation of dichloropropanol from glycerol Type de document : texte imprimé Auteurs : Zheng-Hong Luo, Auteur ; Xiao-Zi You, Auteur ; Jie Zhong, Auteur Année de publication : 2010 Article en page(s) : pp. 10779–10787 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Design--Reactive--Distillation--Column--Direct--Preparation--Dichloropropanol--Glycerol Résumé : In the present study, a reactor design for the direct preparation of dichloropropanol (DCP) from glycerol (GLY) is presented. As an optimum design, a reactive distillation (RD) column in which the second chlorination of GLY occurs during the direct preparation of DCP from GLY has been introduced. Using a simple equilibrium mathematical model of RD, a pilot plant scale column is designed. Furthermore, the whole preparation process of DCP from GLY used the optimum RD column as the central unit is simulated by using an advanced software tool, namely ASPEN PLUS. The pilot plant realization of the whole preparation process is presented and its results are compared with the theoretical prediction. On the basis of the pilot plant data and simulated results, a new technology of DCP production has been designed. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900933b [article] Design of a reactive distillation column for direct preparation of dichloropropanol from glycerol [texte imprimé] / Zheng-Hong Luo, Auteur ; Xiao-Zi You, Auteur ; Jie Zhong, Auteur . - 2010 . - pp. 10779–10787. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10779–10787 Mots-clés : Design--Reactive--Distillation--Column--Direct--Preparation--Dichloropropanol--Glycerol Résumé : In the present study, a reactor design for the direct preparation of dichloropropanol (DCP) from glycerol (GLY) is presented. As an optimum design, a reactive distillation (RD) column in which the second chlorination of GLY occurs during the direct preparation of DCP from GLY has been introduced. Using a simple equilibrium mathematical model of RD, a pilot plant scale column is designed. Furthermore, the whole preparation process of DCP from GLY used the optimum RD column as the central unit is simulated by using an advanced software tool, namely ASPEN PLUS. The pilot plant realization of the whole preparation process is presented and its results are compared with the theoretical prediction. On the basis of the pilot plant data and simulated results, a new technology of DCP production has been designed. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900933b

Design of a reactive distillation column for direct preparation of dichloropropanol from glycerol / Zheng-Hong Luo in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10779–10787 Titre : Design of a reactive distillation column for direct preparation of dichloropropanol from glycerol Type de document : texte imprimé Auteurs : Zheng-Hong Luo, Auteur ; Xiao-Zi You, Auteur ; Jie Zhong, Auteur Année de publication : 2010 Article en page(s) : pp. 10779–10787 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Dichloropropanol  Glycerol  Reactive  distillation  column Résumé : In the present study, a reactor design for the direct preparation of dichloropropanol (DCP) from glycerol (GLY) is presented. As an optimum design, a reactive distillation (RD) column in which the second chlorination of GLY occurs during the direct preparation of DCP from GLY has been introduced. Using a simple equilibrium mathematical model of RD, a pilot plant scale column is designed. Furthermore, the whole preparation process of DCP from GLY used the optimum RD column as the central unit is simulated by using an advanced software tool, namely ASPEN PLUS. The pilot plant realization of the whole preparation process is presented and its results are compared with the theoretical prediction. On the basis of the pilot plant data and simulated results, a new technology of DCP production has been designed. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900933b [article] Design of a reactive distillation column for direct preparation of dichloropropanol from glycerol [texte imprimé] / Zheng-Hong Luo, Auteur ; Xiao-Zi You, Auteur ; Jie Zhong, Auteur . - 2010 . - pp. 10779–10787. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10779–10787 Mots-clés : Dichloropropanol  Glycerol  Reactive  distillation  column Résumé : In the present study, a reactor design for the direct preparation of dichloropropanol (DCP) from glycerol (GLY) is presented. As an optimum design, a reactive distillation (RD) column in which the second chlorination of GLY occurs during the direct preparation of DCP from GLY has been introduced. Using a simple equilibrium mathematical model of RD, a pilot plant scale column is designed. Furthermore, the whole preparation process of DCP from GLY used the optimum RD column as the central unit is simulated by using an advanced software tool, namely ASPEN PLUS. The pilot plant realization of the whole preparation process is presented and its results are compared with the theoretical prediction. On the basis of the pilot plant data and simulated results, a new technology of DCP production has been designed. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900933b

Direct preparation kinetics of 1,3-dichloro-2-propanol from glycerol using acetic acid catalyst / Zheng-Hong Luo in Industrial & engineering chemistry research, Vol. 48 N°1 (Janvier 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - P. 446-452 Titre : Direct preparation kinetics of 1,3-dichloro-2-propanol from glycerol using acetic acid catalyst Type de document : texte imprimé Auteurs : Zheng-Hong Luo, Editeur scientifique ; Xiao-Zi You, Editeur scientifique ; Hua-Rong Li, Editeur scientifique Année de publication : 2009 Article en page(s) : P. 446-452 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Dichloropropène  Glycerol  Acetic  Acid  Catalyst  Kinetic  model Résumé : Direct preparation of 1,3-dichloro-2-propanol from glycerol is carried out in a batch reactor using acetic acid catalyst at 363−393 K. The analytical technique, gas chromatography, is employed in order to follow the time evolution of the reagents. The kinetic model of the process is developed. Furthermore, the model parameters of the process are also determined by data fitting. The results show that direct preparation follows the SN2 mechanism. A kinetic model corresponding to the mechanism is proposed in this work. The experimental results show that the kinetic model agrees well with the experiments. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8011177 [article] Direct preparation kinetics of 1,3-dichloro-2-propanol from glycerol using acetic acid catalyst [texte imprimé] / Zheng-Hong Luo, Editeur scientifique ; Xiao-Zi You, Editeur scientifique ; Hua-Rong Li, Editeur scientifique . - 2009 . - P. 446-452. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - P. 446-452 Mots-clés : Dichloropropène  Glycerol  Acetic  Acid  Catalyst  Kinetic  model Résumé : Direct preparation of 1,3-dichloro-2-propanol from glycerol is carried out in a batch reactor using acetic acid catalyst at 363−393 K. The analytical technique, gas chromatography, is employed in order to follow the time evolution of the reagents. The kinetic model of the process is developed. Furthermore, the model parameters of the process are also determined by data fitting. The results show that direct preparation follows the SN2 mechanism. A kinetic model corresponding to the mechanism is proposed in this work. The experimental results show that the kinetic model agrees well with the experiments. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8011177

Industrial loop reactor for catalytic propylene polymerization / Zheng-Hong Luo in Industrial & engineering chemistry research, Vol. 49 N° 22 (Novembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11232–11243 Titre : Industrial loop reactor for catalytic propylene polymerization : dynamic modeling of emergency accidents Type de document : texte imprimé Auteurs : Zheng-Hong Luo, Auteur ; Pei-Lin Su, Auteur ; Wei Wu, Auteur Année de publication : 2011 Article en page(s) : pp. 11232–11243 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalytic  Propylene  Polymerization Résumé : In industrial loop reactors for catalytic propylene polymerization, the reactor pressure can influence the polymerization rate, feed flow rate, and product properties, especially safe operation of the reactor. To predict the pressure change during polymerization and check the performance of pressure-relief devices in response to emergency accidents, a dynamic model was developed based on mass and energy balances as well as thermodynamics and kinetics. In this model, the pressure was related to the temperature by a state equation for high-pressure liquid. The pipeline equations of the reactors described by the conservation of mechanical energy were incorporated into the model to better predict the pressure. In addition to the pressure, the model can also predict other variables, such as temperature, slurry density, and solids holdup in the reactors. Dynamic data from an industrial plant were used for model validation. Furthermore, the application of the model was demonstrated by simulating several typical emergency accidents. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1003784 [article] Industrial loop reactor for catalytic propylene polymerization : dynamic modeling of emergency accidents [texte imprimé] / Zheng-Hong Luo, Auteur ; Pei-Lin Su, Auteur ; Wei Wu, Auteur . - 2011 . - pp. 11232–11243. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11232–11243 Mots-clés : Catalytic  Propylene  Polymerization Résumé : In industrial loop reactors for catalytic propylene polymerization, the reactor pressure can influence the polymerization rate, feed flow rate, and product properties, especially safe operation of the reactor. To predict the pressure change during polymerization and check the performance of pressure-relief devices in response to emergency accidents, a dynamic model was developed based on mass and energy balances as well as thermodynamics and kinetics. In this model, the pressure was related to the temperature by a state equation for high-pressure liquid. The pipeline equations of the reactors described by the conservation of mechanical energy were incorporated into the model to better predict the pressure. In addition to the pressure, the model can also predict other variables, such as temperature, slurry density, and solids holdup in the reactors. Dynamic data from an industrial plant were used for model validation. Furthermore, the application of the model was demonstrated by simulating several typical emergency accidents. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1003784

Numerical simulation of the gas − solid flow in fluidized - bed polymerization reactors / De-Pan Shi in Industrial & engineering chemistry research, Vol. 49 N° 9 (Mai 2010) 

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