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Methane oxidative coupling / H. R. Godini in Industrial & engineering chemistry research, Vol. 51 N° 22 (Juin 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 22 (Juin 2012) . - pp. 7747-7761 Titre : Methane oxidative coupling : Synthesis of membrane reactor networks Type de document : texte imprimé Auteurs : H. R. Godini, Auteur ; S. Jaso, Auteur ; Shengnan Xiao, Auteur Année de publication : 2012 Article en page(s) : pp. 7747-7761 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Membrane  reactor  Oxidative  coupling Résumé : In this work, the performance of the methane oxidative coupling process based on different alternative reactor structures including fixed-bed reactor, two different feeding-structures of porous packed bed membrane reactor, and different conceptual network combinations of them was analyzed in a comprehensive model-based study. In this context, a contour-based graphical visualizing method accompanied by multiscenario generation and exanrination approach was exploited so as to systematically screen out the high achievable process performances and the corresponding reactor network specifications. As performance indicators, several objective measures including the highest achievable values for yield, selectivity and methane conversion were applied over a high number of design scenarios. Thereby, several sets of structural and operating parameters were evaluated. The investigated parameters are temperature, membrane thicknesses, types of catalysts, amount of inert packing in the catalyst bed, the flow rate of oxygen-rich stream entering the reactor system (total methane to oxygen ratio), distribution of the oxygen rich stream through the reactor blocks (local methane to oxygen ratio), distribution of the total methane-rich feed stream into the reactor blocks, and the contact time represented by the reactor length. A high C2-yield of 31% and 88% C2- selectivity were observed at the same time, and thus, highlighting the performance potential of the reactor network. Moreover, the proposed method enables one to consider operating aspects such as hot spot formation during the analysis and screening procedure. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25968331 [article] Methane oxidative coupling : Synthesis of membrane reactor networks [texte imprimé] / H. R. Godini, Auteur ; S. Jaso, Auteur ; Shengnan Xiao, Auteur . - 2012 . - pp. 7747-7761. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 22 (Juin 2012) . - pp. 7747-7761 Mots-clés : Membrane  reactor  Oxidative  coupling Résumé : In this work, the performance of the methane oxidative coupling process based on different alternative reactor structures including fixed-bed reactor, two different feeding-structures of porous packed bed membrane reactor, and different conceptual network combinations of them was analyzed in a comprehensive model-based study. In this context, a contour-based graphical visualizing method accompanied by multiscenario generation and exanrination approach was exploited so as to systematically screen out the high achievable process performances and the corresponding reactor network specifications. As performance indicators, several objective measures including the highest achievable values for yield, selectivity and methane conversion were applied over a high number of design scenarios. Thereby, several sets of structural and operating parameters were evaluated. The investigated parameters are temperature, membrane thicknesses, types of catalysts, amount of inert packing in the catalyst bed, the flow rate of oxygen-rich stream entering the reactor system (total methane to oxygen ratio), distribution of the oxygen rich stream through the reactor blocks (local methane to oxygen ratio), distribution of the total methane-rich feed stream into the reactor blocks, and the contact time represented by the reactor length. A high C2-yield of 31% and 88% C2- selectivity were observed at the same time, and thus, highlighting the performance potential of the reactor network. Moreover, the proposed method enables one to consider operating aspects such as hot spot formation during the analysis and screening procedure. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25968331

Model-based analysis of reactor feeding policies for methane oxidative coupling / H. R. Godini in Industrial & engineering chemistry research, Vol. 49 N° 8 (Avril 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3544–3552 Titre : Model-based analysis of reactor feeding policies for methane oxidative coupling Type de document : texte imprimé Auteurs : H. R. Godini, Auteur ; H. Arellano-Garcia, Auteur ; M. Omidkhah, Auteur Année de publication : 2010 Article en page(s) : pp. 3544–3552 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Reactor  Feeding  Policies  Methane  Oxidative  Coupling Résumé : In this work, a new feeding policy structure for an alternative operation mode of the packed bed membrane reactor (PBMR) is proposed in order to increase the efficiency of the OCM—oxidative coupling of methane—process. This structure has a high potential to improve the process performance in comparison to fixed bed reactors (PFRs) and even to a conventional PBMR design structure. The main drawbacks in operating PFR or PBMR have been to find suitable operation policies toward the enhancement of both yield and selectivity at the same time. In this work, a model-based comparative study of the OCM process performance for these three reactors types is presented. For this purpose, the effect of oxygen accessibility in the different design structures is investigated. Basically, the new proposed feeding policy structure combines the advantages of PFR and the conventional PBMR so as to get a high yield amount by cofeeding methane and oxygen into the reactor entrance while guaranteeing an acceptable level of selectivity by reducing the accessibility to ethylene and oxygen, in particular, at the reactor end. Moreover, using the potential of the proposed operation mode, it is now possible to build a reactor network consisting of the new proposed and the conventional PBMR in order to treat the shell side gas streams, which results from each PBMR structure. The analysis of the proposed reactor network shows a performance of 23.21% yield, 53.93% selectivity, and 42.66% methane conversion, respectively. Besides, a sensitivity analysis is performed in order to analyze the effect of reactant accessibility in the proposed feeding policy structure. The results are analyzed along with the study of the optimal operating range in order to conceptually design a membrane reactor network toward satisfying economical and industrial considerations in terms of selectivity, one-pass yield, and methane conversion. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900182q?prevSearch=Model-based%2Banalysis% [...] [article] Model-based analysis of reactor feeding policies for methane oxidative coupling [texte imprimé] / H. R. Godini, Auteur ; H. Arellano-Garcia, Auteur ; M. Omidkhah, Auteur . - 2010 . - pp. 3544–3552. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3544–3552 Mots-clés : Reactor  Feeding  Policies  Methane  Oxidative  Coupling Résumé : In this work, a new feeding policy structure for an alternative operation mode of the packed bed membrane reactor (PBMR) is proposed in order to increase the efficiency of the OCM—oxidative coupling of methane—process. This structure has a high potential to improve the process performance in comparison to fixed bed reactors (PFRs) and even to a conventional PBMR design structure. The main drawbacks in operating PFR or PBMR have been to find suitable operation policies toward the enhancement of both yield and selectivity at the same time. In this work, a model-based comparative study of the OCM process performance for these three reactors types is presented. For this purpose, the effect of oxygen accessibility in the different design structures is investigated. Basically, the new proposed feeding policy structure combines the advantages of PFR and the conventional PBMR so as to get a high yield amount by cofeeding methane and oxygen into the reactor entrance while guaranteeing an acceptable level of selectivity by reducing the accessibility to ethylene and oxygen, in particular, at the reactor end. Moreover, using the potential of the proposed operation mode, it is now possible to build a reactor network consisting of the new proposed and the conventional PBMR in order to treat the shell side gas streams, which results from each PBMR structure. The analysis of the proposed reactor network shows a performance of 23.21% yield, 53.93% selectivity, and 42.66% methane conversion, respectively. Besides, a sensitivity analysis is performed in order to analyze the effect of reactant accessibility in the proposed feeding policy structure. The results are analyzed along with the study of the optimal operating range in order to conceptually design a membrane reactor network toward satisfying economical and industrial considerations in terms of selectivity, one-pass yield, and methane conversion. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900182q?prevSearch=Model-based%2Banalysis% [...]