Documents disponibles écrits par cet auteur

Enhancement in research octane number and hydrogen production via dynamic optimization of a novel spherical axial - flow membrane naphtha reformer / Mohammad Reza Rahimpour in Industrial & engineering chemistry research, Vol. 51 N° 1 (Janvier 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 398–409 Titre : Enhancement in research octane number and hydrogen production via dynamic optimization of a novel spherical axial - flow membrane naphtha reformer Type de document : texte imprimé Auteurs : Mohammad Reza Rahimpour, Auteur ; Davood Iranshahi, Auteur ; Khadijeh Paymooni, Auteur Année de publication : 2012 Article en page(s) : pp. 398–409 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Dynamic  Optimization Résumé : Spherical axial-flow membrane reactors (SMR) can be proposed as a promising alternative for conventional tubular reactors (CTR) in the catalytic naphtha reforming process. In this study, the operating conditions and design parameters of SMR are optimized via a differential evolution (DE) method to maximize the hydrogen yield, the reformate production rate, and the aromatic content of reformate (octane number). Regarding this, 26 decision variables such as the membrane thickness, catalyst mass distribution, and flow distribution of sweeping gas are optimized, and the performance of the SMR is evaluated under optimized operating conditions. The optimization results show that the operating costs can decrease sharply with a decrease in the sweeping gas streamlines’ pressures where they decline from 985, 1810, and 2000 kPa in the first, the second, and the third reactors of nonoptimized SMR to 242.4, 563.1, and 796.6 kPa in optimized SMR, respectively. Moreover, the research octane number (RON) of gasoline can improve well in optimized SMR owing to the achievement of higher aromatic yield and the aromatic content of the reformate. Consequently, an optimized SMR configuration can properly address the increasing demand for high-octane gasoline. The superiority of the optimized SMR configuration to CTR can be counted as assisting the membrane concept, lower pressure drop along the reaction side, and utilizing the optimum operating conditions. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2010912 [article] Enhancement in research octane number and hydrogen production via dynamic optimization of a novel spherical axial - flow membrane naphtha reformer [texte imprimé] / Mohammad Reza Rahimpour, Auteur ; Davood Iranshahi, Auteur ; Khadijeh Paymooni, Auteur . - 2012 . - pp. 398–409. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 398–409 Mots-clés : Dynamic  Optimization Résumé : Spherical axial-flow membrane reactors (SMR) can be proposed as a promising alternative for conventional tubular reactors (CTR) in the catalytic naphtha reforming process. In this study, the operating conditions and design parameters of SMR are optimized via a differential evolution (DE) method to maximize the hydrogen yield, the reformate production rate, and the aromatic content of reformate (octane number). Regarding this, 26 decision variables such as the membrane thickness, catalyst mass distribution, and flow distribution of sweeping gas are optimized, and the performance of the SMR is evaluated under optimized operating conditions. The optimization results show that the operating costs can decrease sharply with a decrease in the sweeping gas streamlines’ pressures where they decline from 985, 1810, and 2000 kPa in the first, the second, and the third reactors of nonoptimized SMR to 242.4, 563.1, and 796.6 kPa in optimized SMR, respectively. Moreover, the research octane number (RON) of gasoline can improve well in optimized SMR owing to the achievement of higher aromatic yield and the aromatic content of the reformate. Consequently, an optimized SMR configuration can properly address the increasing demand for high-octane gasoline. The superiority of the optimized SMR configuration to CTR can be counted as assisting the membrane concept, lower pressure drop along the reaction side, and utilizing the optimum operating conditions. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2010912

Start - up and dynamic analysis of a novel thermally coupled reactor for the simultaneous production of methanol and benzene / Mohammad Hasan Khademi in Industrial & engineering chemistry research, Vol. 50 N° 21 (Novembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 21 (Novembre 2011) . - pp. 12092-12102 Titre : Start - up and dynamic analysis of a novel thermally coupled reactor for the simultaneous production of methanol and benzene Type de document : texte imprimé Auteurs : Mohammad Hasan Khademi, Auteur ; Mohammad Reza Rahimpour, Auteur ; Abdolhossein Jahanmiri, Auteur Année de publication : 2011 Article en page(s) : pp. 12092-12102 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Production  Reactor Résumé : Coupling energy intensive endothermic reaction systems with suitable exothermic reactions improves the thermal efficiency of processes, achieving the autothermality within the reactor, reducing the size of the reactors, and achieving a multiple reactants-multiple products configuration. In this study, a dynamic heterogeneous model for a novel thermally coupled reactor-containing methanol synthesis reactions and cyclohexane dehydrogenation-is developed to consider the startup and transient response of the system. This heat-exchanger reactor consists of two fixed beds separated by a wall, where heat is transferred across the surface of tube from the exothermic side to the endothermic side. The proposed model was validated against conventional methanol synthesis reactor, and a good agreement was achieved. Dynamic simulation results for the co-current mode have been investigated to present the response of the reactor outlet temperature, methanol yield, and cyclohexane conversion in the cases of a step change in the initial molar flow rate and inlet temperature of both sides. The challenges posed by the transient operation of thermally coupled reactor are identified to avoid severe issues that can arise in the course of operating the reactor (such as reactor extinction). The results suggest that control of this coupled reactor could be feasible and beneficial. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24697526 [article] Start - up and dynamic analysis of a novel thermally coupled reactor for the simultaneous production of methanol and benzene [texte imprimé] / Mohammad Hasan Khademi, Auteur ; Mohammad Reza Rahimpour, Auteur ; Abdolhossein Jahanmiri, Auteur . - 2011 . - pp. 12092-12102. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 21 (Novembre 2011) . - pp. 12092-12102 Mots-clés : Production  Reactor Résumé : Coupling energy intensive endothermic reaction systems with suitable exothermic reactions improves the thermal efficiency of processes, achieving the autothermality within the reactor, reducing the size of the reactors, and achieving a multiple reactants-multiple products configuration. In this study, a dynamic heterogeneous model for a novel thermally coupled reactor-containing methanol synthesis reactions and cyclohexane dehydrogenation-is developed to consider the startup and transient response of the system. This heat-exchanger reactor consists of two fixed beds separated by a wall, where heat is transferred across the surface of tube from the exothermic side to the endothermic side. The proposed model was validated against conventional methanol synthesis reactor, and a good agreement was achieved. Dynamic simulation results for the co-current mode have been investigated to present the response of the reactor outlet temperature, methanol yield, and cyclohexane conversion in the cases of a step change in the initial molar flow rate and inlet temperature of both sides. The challenges posed by the transient operation of thermally coupled reactor are identified to avoid severe issues that can arise in the course of operating the reactor (such as reactor extinction). The results suggest that control of this coupled reactor could be feasible and beneficial. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24697526