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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

Modeling and control of a proton exchange membrane fuel cell system with alternative fuel sources / Wei Wu in Industrial & engineering chemistry research, Vol. 48 N° 19 (Octobre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 19 (Octobre 2009) . - pp. 8999–9005 Titre : Modeling and control of a proton exchange membrane fuel cell system with alternative fuel sources Type de document : texte imprimé Auteurs : Wei Wu, Auteur ; Che-Chuan Pai, Auteur Année de publication : 2009 Article en page(s) : pp. 8999–9005 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Proton  exchange  membrane  Methanol  fuel  Water  flow  Open-loop  tests Résumé : The aim of this work is to study the control of the proton exchange membrane (PEM) fuel cell stack system with alternative methanol fuel. An external circulating water flow design not only plays the role of heat exchanger, but also it is the one of reactants of the methanol reforming system. The open-loop tests show that the variation of water flow causes unsteady hydrogen production at the exit of fuel processing units (FPUs) to seriously affect the stack temperature and reduce the performance of the power system. Since the reforming-integrated fuel cell system has strongly nonlinear behavior, the model-free fuzzy control technique is used to ensure the stable output regulation. On the basis of the proportional−integral−derivative (PID) configuration with one tuning parameter, the closed-loop simulation shows that the controller reliability is satisfactory when unknown inlet perturbations and loads appear. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801460t [article] Modeling and control of a proton exchange membrane fuel cell system with alternative fuel sources [texte imprimé] / Wei Wu, Auteur ; Che-Chuan Pai, Auteur . - 2009 . - pp. 8999–9005. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 19 (Octobre 2009) . - pp. 8999–9005 Mots-clés : Proton  exchange  membrane  Methanol  fuel  Water  flow  Open-loop  tests Résumé : The aim of this work is to study the control of the proton exchange membrane (PEM) fuel cell stack system with alternative methanol fuel. An external circulating water flow design not only plays the role of heat exchanger, but also it is the one of reactants of the methanol reforming system. The open-loop tests show that the variation of water flow causes unsteady hydrogen production at the exit of fuel processing units (FPUs) to seriously affect the stack temperature and reduce the performance of the power system. Since the reforming-integrated fuel cell system has strongly nonlinear behavior, the model-free fuzzy control technique is used to ensure the stable output regulation. On the basis of the proportional−integral−derivative (PID) configuration with one tuning parameter, the closed-loop simulation shows that the controller reliability is satisfactory when unknown inlet perturbations and loads appear. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801460t

Preparation and performance of polyimide-reinforced clay aerogel composites / Wei Wu in Industrial & engineering chemistry research, Vol. 51 N° 39 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 39 (Octobre 2012) . - pp. 12821-12826 Titre : Preparation and performance of polyimide-reinforced clay aerogel composites Type de document : texte imprimé Auteurs : Wei Wu, Auteur ; Kai Wang, Auteur ; Mao-Sheng Zhan, Auteur Année de publication : 2012 Article en page(s) : pp. 12821-12826 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Composite  material  Preparation Résumé : Low-density polyimide (PI)/clay aerogel composites were produced by freeze-drying of a poly(amic acid) ammonium salt/clay precursor suspension, followed by a multistep temperature-programmed imidization. The densities of the resulting aerogel composites were in the range of 0.04―0.09 g·cm―3. With the increase of PI content, a more perfect "layer―strut" bracing structure was exhibited in the composites, which resulted in vastly improved mechanical properties. Polyimide did not intercalate the interlayer of clay, and the onset decomposition temperatures (Td) of the aerogels were more than 410 °C. The obtained PI/clay aerogel composites show considerable promise in structural and high-temperature insulation applications. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26419238 [article] Preparation and performance of polyimide-reinforced clay aerogel composites [texte imprimé] / Wei Wu, Auteur ; Kai Wang, Auteur ; Mao-Sheng Zhan, Auteur . - 2012 . - pp. 12821-12826. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 39 (Octobre 2012) . - pp. 12821-12826 Mots-clés : Composite  material  Preparation Résumé : Low-density polyimide (PI)/clay aerogel composites were produced by freeze-drying of a poly(amic acid) ammonium salt/clay precursor suspension, followed by a multistep temperature-programmed imidization. The densities of the resulting aerogel composites were in the range of 0.04―0.09 g·cm―3. With the increase of PI content, a more perfect "layer―strut" bracing structure was exhibited in the composites, which resulted in vastly improved mechanical properties. Polyimide did not intercalate the interlayer of clay, and the onset decomposition temperatures (Td) of the aerogels were more than 410 °C. The obtained PI/clay aerogel composites show considerable promise in structural and high-temperature insulation applications. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26419238

Preparation of polyaniline nanofibers by high gravity chemical oxidative polymerization / Xin-wei Lu 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. 5589-5595 Titre : Preparation of polyaniline nanofibers by high gravity chemical oxidative polymerization Type de document : texte imprimé Auteurs : Xin-wei Lu, Auteur ; Wei Wu, Auteur ; Jian-feng Chen, Auteur Année de publication : 2011 Article en page(s) : pp. 5589-5595 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Polymerization  Oxidation  Preparation Résumé : To develop a suitable method for the mass production of polyaniline (PANI) nanofibers, the preparation of PANI nanofibers was carried out by high gravity chemical oxidative polymerization (HGCOP) in a rotating packed bed (RPB) for the first time. The influences of operating conditions, e.g., aniline concentration, high-gravity level, reaction temperature, and dopants, on the morphology of PANI nanofibers were investigated in detail. FTIR, UV―vis, XRD, molecular weight, and conductivity analyses were performed to characterize the products. Advantages of this new method are discussed. PANI nanofibers were successfully obtained in a wide range of aniline concentration (0.1―0.5 M) and reaction temperature (0―60 °C). The nanofibers kept small diameters of 30―50 nm and uniform morphology even when synthesized with a high initial aniline concentration of 0.5 M. This method provides a significant improvement to the rapid mixing route to prepare PANI nanofibers in large scale, moreover, it has potential applications in the synthesis of other conductive polymers. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24128682 [article] Preparation of polyaniline nanofibers by high gravity chemical oxidative polymerization [texte imprimé] / Xin-wei Lu, Auteur ; Wei Wu, Auteur ; Jian-feng Chen, Auteur . - 2011 . - pp. 5589-5595. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5589-5595 Mots-clés : Polymerization  Oxidation  Preparation Résumé : To develop a suitable method for the mass production of polyaniline (PANI) nanofibers, the preparation of PANI nanofibers was carried out by high gravity chemical oxidative polymerization (HGCOP) in a rotating packed bed (RPB) for the first time. The influences of operating conditions, e.g., aniline concentration, high-gravity level, reaction temperature, and dopants, on the morphology of PANI nanofibers were investigated in detail. FTIR, UV―vis, XRD, molecular weight, and conductivity analyses were performed to characterize the products. Advantages of this new method are discussed. PANI nanofibers were successfully obtained in a wide range of aniline concentration (0.1―0.5 M) and reaction temperature (0―60 °C). The nanofibers kept small diameters of 30―50 nm and uniform morphology even when synthesized with a high initial aniline concentration of 0.5 M. This method provides a significant improvement to the rapid mixing route to prepare PANI nanofibers in large scale, moreover, it has potential applications in the synthesis of other conductive polymers. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24128682