Documents disponibles écrits par cet auteur

Carbon-modified alumina and alumina-carbon-supported hydrotreating catalysts / S. K. Maity in Industrial & engineering chemistry research, Vol. 48 N°3 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1190–1195 Titre : Carbon-modified alumina and alumina-carbon-supported hydrotreating catalysts Type de document : texte imprimé Auteurs : S. K. Maity, Auteur ; L. Flores, Auteur ; Jorge Ancheyta, Auteur ; H. Fukuyama, Auteur Année de publication : 2009 Article en page(s) : p. 1190–1195 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Energy  Carbon  Alumina  Oil  --  Hydrotreating  Catalysts Résumé : Two types of supports, carbon-modified alumina and alumina−carbon, were prepared in this investigation. These supports were used to prepare hydrotreating (HDT) catalysts for Maya heavy crude. It was found that, when carbon was added to the alumina matrix and the carbon was then burned, pores having larger diameter were generated. The average pore diameter of the support increased with increasing amount of carbon in the alumina. However, when the carbon was not burned, the pore size decreased with added carbon. The hydrotreating activity results show that, because of the larger pore diameter and higher pore volume, the modified-alumina-supported PCoMo catalysts have slightly higher activities than the alumina−carbon-supported catalysts. The effects of additives, boron and phosphorus, on the hydrotreating of heavy oil were also compared. It was found that P-containing catalysts have higher activities than B-containing catalysts. It was also found that, when boron-containing catalyst were prepared at higher pH, they had higher hydrodemetalation (HDM) activities. Deactivation studies showed that the presence of carbon in the support might hinder rate of deactivation during hydrotreating of heavy oil. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800606p [article] Carbon-modified alumina and alumina-carbon-supported hydrotreating catalysts [texte imprimé] / S. K. Maity, Auteur ; L. Flores, Auteur ; Jorge Ancheyta, Auteur ; H. Fukuyama, Auteur . - 2009 . - p. 1190–1195. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1190–1195 Mots-clés : Energy  Carbon  Alumina  Oil  --  Hydrotreating  Catalysts Résumé : Two types of supports, carbon-modified alumina and alumina−carbon, were prepared in this investigation. These supports were used to prepare hydrotreating (HDT) catalysts for Maya heavy crude. It was found that, when carbon was added to the alumina matrix and the carbon was then burned, pores having larger diameter were generated. The average pore diameter of the support increased with increasing amount of carbon in the alumina. However, when the carbon was not burned, the pore size decreased with added carbon. The hydrotreating activity results show that, because of the larger pore diameter and higher pore volume, the modified-alumina-supported PCoMo catalysts have slightly higher activities than the alumina−carbon-supported catalysts. The effects of additives, boron and phosphorus, on the hydrotreating of heavy oil were also compared. It was found that P-containing catalysts have higher activities than B-containing catalysts. It was also found that, when boron-containing catalyst were prepared at higher pH, they had higher hydrodemetalation (HDM) activities. Deactivation studies showed that the presence of carbon in the support might hinder rate of deactivation during hydrotreating of heavy oil. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800606p

Effect of liquid quenching on hydroprocessing of heavy crude oils in a fixed-bed reactor system / Anton Alvarez in Industrial & engineering chemistry research, Vol. 48 N°3 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1228–1236 Titre : Effect of liquid quenching on hydroprocessing of heavy crude oils in a fixed-bed reactor system Type de document : texte imprimé Auteurs : Anton Alvarez, Auteur ; Jorge Ancheyta, Auteur Année de publication : 2009 Article en page(s) : p. 1228–1236 Note générale : Cemical engineering Langues : Anglais (eng) Mots-clés : Oil  Gas  Liquid  Quenching  Hydroprocessing Résumé : The effect of liquid quenching during the hydroprocessing of a heavy crude oil in a fixed-bed reactor system was explored. Experiments were carried out at various operating conditions in a pilot plant equipped with two fixed-bed reactors in series loaded with a triple catalyst system and necessary hardware for injecting quench fluids between reactors. The feed and quench liquid were prepared by splitting a heavy crude oil into two fractions, called light and heavy fractions. The heavy fraction was used as the feed to the reactors, whereas the light fraction was injected between reactors as the quenching liquid. To establish a reference case, a conventional hydrogen quenching scheme was also evaluated by injecting hydrogen instead of the light fraction. It was observed that hydrogen quenching produced only marginally better quality because of a more favorable H2/oil profile. Yet, it was determined that this approach (hydrogen quenching) requires the handling of large volumes of gas, which increases compressor capacity and equipment size. Liquid quenching, on the other hand, decreases the reaction severity by increasing the liquid hourly space velocity (LHSV), which affects product quality although not significantly. Compared with hydrogen quenching, liquid quenching dramatically reduces the quench volumetric rate and consequently compression costs, which makes this approach an economically attractive option for industrial application. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800686g [article] Effect of liquid quenching on hydroprocessing of heavy crude oils in a fixed-bed reactor system [texte imprimé] / Anton Alvarez, Auteur ; Jorge Ancheyta, Auteur . - 2009 . - p. 1228–1236. Cemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1228–1236 Mots-clés : Oil  Gas  Liquid  Quenching  Hydroprocessing Résumé : The effect of liquid quenching during the hydroprocessing of a heavy crude oil in a fixed-bed reactor system was explored. Experiments were carried out at various operating conditions in a pilot plant equipped with two fixed-bed reactors in series loaded with a triple catalyst system and necessary hardware for injecting quench fluids between reactors. The feed and quench liquid were prepared by splitting a heavy crude oil into two fractions, called light and heavy fractions. The heavy fraction was used as the feed to the reactors, whereas the light fraction was injected between reactors as the quenching liquid. To establish a reference case, a conventional hydrogen quenching scheme was also evaluated by injecting hydrogen instead of the light fraction. It was observed that hydrogen quenching produced only marginally better quality because of a more favorable H2/oil profile. Yet, it was determined that this approach (hydrogen quenching) requires the handling of large volumes of gas, which increases compressor capacity and equipment size. Liquid quenching, on the other hand, decreases the reaction severity by increasing the liquid hourly space velocity (LHSV), which affects product quality although not significantly. Compared with hydrogen quenching, liquid quenching dramatically reduces the quench volumetric rate and consequently compression costs, which makes this approach an economically attractive option for industrial application. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800686g

Effect of the incorporation of Al, Ti, and Zr on the cracking and hydrodesulfurization activity of NiMo/SBA-15 catalysts / P. Rayo in Industrial & engineering chemistry research, Vol. 48 N°3 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1242–1248 Titre : Effect of the incorporation of Al, Ti, and Zr on the cracking and hydrodesulfurization activity of NiMo/SBA-15 catalysts Type de document : texte imprimé Auteurs : P. Rayo, Auteur ; J. Ramírez, Auteur ; Jorge Ancheyta, Auteur Année de publication : 2009 Article en page(s) : p. 1242–1248 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Sulfur  Hydrodesulfurization  NiMo  catalysts Résumé : The hydrodesulfurization and cracking activity of NiMo sulfided catalysts supported on Al-, Ti-, and Zr-modified SBA-15 was measured using the HDS of thiophene and cracking of cumene as model reactions. The results were used to analyze the effect of each heteroatom on the two reactions, and the existence of a relationship between HDS activity and the catalysts acid properties. The HDS activity of sulfided NiMo catalysts supported on Al-, Ti-, or Zr-modified SBA-15 depends significantly on the nature of the heteroatom used to modify the SBA-15 support. The HDS activity trend displayed by the catalysts was NiMo/Al20-SBA-15 > NiMo/Ti20-SBA-15 > NiMo/Zr20-SBA-15. This trend was similar for the cumene cracking reaction. The results indicate that Brønsted acidity favors hydrodesulfurization. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800862a [article] Effect of the incorporation of Al, Ti, and Zr on the cracking and hydrodesulfurization activity of NiMo/SBA-15 catalysts [texte imprimé] / P. Rayo, Auteur ; J. Ramírez, Auteur ; Jorge Ancheyta, Auteur . - 2009 . - p. 1242–1248. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1242–1248 Mots-clés : Sulfur  Hydrodesulfurization  NiMo  catalysts Résumé : The hydrodesulfurization and cracking activity of NiMo sulfided catalysts supported on Al-, Ti-, and Zr-modified SBA-15 was measured using the HDS of thiophene and cracking of cumene as model reactions. The results were used to analyze the effect of each heteroatom on the two reactions, and the existence of a relationship between HDS activity and the catalysts acid properties. The HDS activity of sulfided NiMo catalysts supported on Al-, Ti-, or Zr-modified SBA-15 depends significantly on the nature of the heteroatom used to modify the SBA-15 support. The HDS activity trend displayed by the catalysts was NiMo/Al20-SBA-15 > NiMo/Ti20-SBA-15 > NiMo/Zr20-SBA-15. This trend was similar for the cumene cracking reaction. The results indicate that Brønsted acidity favors hydrodesulfurization. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800862a

Vapor-liquid equilibrium study in trickle-bed reactors / Jinwen Chen in Industrial & engineering chemistry research, Vol. 48 N°3 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1096–1106 Titre : Vapor-liquid equilibrium study in trickle-bed reactors Type de document : texte imprimé Auteurs : Jinwen Chen, Auteur ; Neil Wang, Auteur ; Fabian Mederos, Auteur ; Jorge Ancheyta, Auteur Année de publication : 2009 Article en page(s) : p. 1096–1106 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Vapor-liquid  Hydrodynamique  des  fluides  Reactors Résumé : Vapor−liquid equilibrium (VLE) in trickle-bed hydroprocessing reactors can significantly change the fluid hydrodynamics and the distribution of reacting species in both the vapor and liquid phases and, ultimately, change the reactor performance. VLE is especially important to pilot-plant studies in which ideal operating regimes (plug flow, full catalyst wetting, absence of reactor wall effects, etc.) are desired to generate reliable, reproducible, and representative data for commercial scale-up and kinetics studies. In this article, we report VLE flash experiments that were conducted in a continuous-flow unit with hydrogen and various petroleum middle distillates under typical hydrotreating conditions to study the relative distribution of the oil in the two phases. The experimental data were further used to evaluate the interaction coefficients, required to perform VLE flash calculations, between hydrogen and hydrocarbon boiling-point pseudocomponents. Furthermore, flow hydrodynamics were predicted in a pilot-plant trickle-bed reactor for hydrotreating two different middle distillate feeds to provide a mapping of operating conditions under which the desired operating regimes could be maintained. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8006006 [article] Vapor-liquid equilibrium study in trickle-bed reactors [texte imprimé] / Jinwen Chen, Auteur ; Neil Wang, Auteur ; Fabian Mederos, Auteur ; Jorge Ancheyta, Auteur . - 2009 . - p. 1096–1106. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1096–1106 Mots-clés : Vapor-liquid  Hydrodynamique  des  fluides  Reactors Résumé : Vapor−liquid equilibrium (VLE) in trickle-bed hydroprocessing reactors can significantly change the fluid hydrodynamics and the distribution of reacting species in both the vapor and liquid phases and, ultimately, change the reactor performance. VLE is especially important to pilot-plant studies in which ideal operating regimes (plug flow, full catalyst wetting, absence of reactor wall effects, etc.) are desired to generate reliable, reproducible, and representative data for commercial scale-up and kinetics studies. In this article, we report VLE flash experiments that were conducted in a continuous-flow unit with hydrogen and various petroleum middle distillates under typical hydrotreating conditions to study the relative distribution of the oil in the two phases. The experimental data were further used to evaluate the interaction coefficients, required to perform VLE flash calculations, between hydrogen and hydrocarbon boiling-point pseudocomponents. Furthermore, flow hydrodynamics were predicted in a pilot-plant trickle-bed reactor for hydrotreating two different middle distillate feeds to provide a mapping of operating conditions under which the desired operating regimes could be maintained. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8006006