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

A New model for the calculation of height equivalent to theoretical plate in high pressure columns equipped with structured packing for iC4/nC4 separation / Mohmmad Reza Rahimpour 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. 6886-6897 Titre : A New model for the calculation of height equivalent to theoretical plate in high pressure columns equipped with structured packing for iC4/nC4 separation Type de document : texte imprimé Auteurs : Mohmmad Reza Rahimpour, Auteur ; Momeni Hossein, Auteur ; Khadijeh Paymooni, Auteur Année de publication : 2011 Article en page(s) : pp. 6886-6897 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Ordered  packing  Modeling Résumé : A semi-empirical model is proposed to investigate the performance of packed columns equipped with structured packing at high pressures. The mass transfer efficiency is determined in terms of height equivalent to theoretcial plate (HETP) for empirical data of an iC4/nC4 mixture at elevated pressures. Some unexpected phenomena cause predictive models of mass transfer to be inaccurate at high pressures. The effects of the gas phase backmixing and the liquid maldistribution on the gas phase mass transfer coefficient and the effective interfacial area have been investigated in this study. The modified model is developed on the basis of the Delft model to predict the mass transfer behavior of structured packing at high pressures. The proposed model is validated by the empirical data and good agreement is observed between the empirical data and the results of the modified model. The error of HETP calculation by the modified model is less than the other models especially at moderate and high pressures. At low pressures, predicted values of different models are almost the same and they show minor errors. The difference between predicted HETP by various models increases by pressure rising. Moreover, the effect of liquid load on mass transfer in packed columns is investigated. The proposed model can predict the effect of liquid load on mass transfer performance. Proper efficiency has been obtained by the modified model for iC4/nC4 separation process in structured packed column at high pressures. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24199906 [article] A New model for the calculation of height equivalent to theoretical plate in high pressure columns equipped with structured packing for iC4/nC4 separation [texte imprimé] / Mohmmad Reza Rahimpour, Auteur ; Momeni Hossein, Auteur ; Khadijeh Paymooni, Auteur . - 2011 . - pp. 6886-6897. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp. 6886-6897 Mots-clés : Ordered  packing  Modeling Résumé : A semi-empirical model is proposed to investigate the performance of packed columns equipped with structured packing at high pressures. The mass transfer efficiency is determined in terms of height equivalent to theoretcial plate (HETP) for empirical data of an iC4/nC4 mixture at elevated pressures. Some unexpected phenomena cause predictive models of mass transfer to be inaccurate at high pressures. The effects of the gas phase backmixing and the liquid maldistribution on the gas phase mass transfer coefficient and the effective interfacial area have been investigated in this study. The modified model is developed on the basis of the Delft model to predict the mass transfer behavior of structured packing at high pressures. The proposed model is validated by the empirical data and good agreement is observed between the empirical data and the results of the modified model. The error of HETP calculation by the modified model is less than the other models especially at moderate and high pressures. At low pressures, predicted values of different models are almost the same and they show minor errors. The difference between predicted HETP by various models increases by pressure rising. Moreover, the effect of liquid load on mass transfer in packed columns is investigated. The proposed model can predict the effect of liquid load on mass transfer performance. Proper efficiency has been obtained by the modified model for iC4/nC4 separation process in structured packed column at high pressures. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24199906