The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
James A. Dumesic - One of the best experts on this subject based on the ideXlab platform.
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Selective dehydrogenation of isobutane over supported Pt/Sn catalysts
Catalysis Today, 2000Co-Authors: Randy D. Cortright, Josephine M. Hill, James A. DumesicAbstract:Catalytic dehydrogenation of isobutane is important because of growing demand for Isobutene as a precursor for the production of oxygenates required in reformulated gasoline. It was found that supporting tin and platinum in K-L-zeolite produces catalysts that exhibit high activity and selectivity for isobutane dehydrogenation. Furthermore, Pt/Sn/K-L-zeolite catalysts exhibit high resistance to deactivation at conditions conducive to high dehydrogenation conversions. Fundamental investigations of silica-supported Pt/Sn catalysts show that tin interacts with platinum to form Pt/Sn alloy particles, which reduces the size of surface Pt ensembles and inhibits the formation of highly dehydrogenated surface species required for the competing isomerization, hydrogenolysis, and coking reactions. Similarly, the addition of potassium to Pt/Sn/SiO2 increases the selectivity for isobutane dehydrogenation by further reducing the size of surface Pt ensembles. © 2000 Elsevier Science B.V. All rights reserved.
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Kinetic studies of isobutane dehydrogenation and Isobutene hydrogenation over Pt/Sn-based catalysts
Industrial and Engineering Chemistry Research, 1998Co-Authors: Randy D. Cortright, Per E. Levin, James A. DumesicAbstract:Rates of isobutane dehydrogenation and Isobutene hydrogenation were measured over Pt/Sn/ SiO 2 , Pt/Sn/K/SiO 2 , and Pt/Sn/K-L-zeolite catalysts at temperatures from 673 to 773 K and at various partial pressures for a total pressure of 1 atm. Addition of potassium to Pt/Sn/SiO 2 enhances the rate of Isobutene hydrogenation and isobutane dehydrogenation, and the Pt/Sn/ K-L-zeolite catalyst exhibits considerably higher rates than Pt/Sn/SiO 2 and Pt/Sn/K/SiO 2 . The kinetic data for the hydrogenation and dehydrogenation reactions over the Pt/Sn catalysts could be described by a four-step Horiuti-Polanyi mechanism, with rate-limiting, dissociative adsorption of isobutane and quasi-equilibrated adsorption of hydrogen and Isobutene. The higher rates observed over Pt/Sn/K/SiO 2 and Pt/Sn/K-L-zeolite may be attributed to stabilization of the activated complex involved in the dissociative adsorption/desorption of isobutane on the Pt/ Sn clusters within the zeolite pore structure and/or stabilization by the presence of potassium.
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Silica- and L-zeolite-supported Pt, Pt/Sn and Pt/Sn/K catalysts for isobutane dehydrogenation
Applied Catalysis A: General, 1998Co-Authors: Josephine M. Hill, Randy D. Cortright, James A. DumesicAbstract:Reaction kinetics measurements, temperature programmed oxidation (TPO), transmission electron microscopy, and chemisorption measurements were used to study silica- and L-zeolite-supported Pt catalysts for isobutane dehydrogenation at 798 K in pure isobutane and at 873 K with a 2 : 1 hydrogen : isobutane feed. Highly selective dehydrogenation catalysts were prepared by depositing Pt and Sn on K-L-zeolite, as well as by depositing Pt, Sn, and K on silica. At 873 K and in the presence of hydrogen, the Pt/Sn/K-L catalysts exhibited significantly higher rates of Isobutene production compared to the Pt/Sn/K/ silica catalyst. Addition of Sn and K to Pt decreased the extent of carbon deposition on the catalysts by reducing the size of the Pt surface ensembles, thereby inhibiting the formation of highly dehydrogenated surface species that lead to coke and other undesirable products (e.g. hydrogenolysis). The presence of Sn may also facilitate the transport of the carbon deposits from the active sites to the support. In the absence of hydrogen, the pores of Pt/K-L-zeolite become blocked by carbonaceous deposits during isobutane dehydrogenation at 798 K. At 873 K and in the presence of hydrogen, the Pt/Sn/K-L catalysts exhibit deactivation due to coking, enrichment of the surface with tin, and/or sintering of the metal particles. © 1998 Elsevier Science B.V.
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Microcalometric studies of interactions of ethene, Isobutene, and isobutane with silica-supported Pd, Pt, and PtSn
Catalysis Letters, 1997Co-Authors: M.a. Natal-santiago, Randy D. Cortright, Simon G Podkolzin, James A. DumesicAbstract:Microcalorimetric measurements were made of the interaction of hydrogen, ethene, Isobutene and isobutane at 300 K with silica-supported Pt, Pd, and PtSn catalysts. The initial heats of hydrogen adsorption on silica-supported Pd and Pt are 104 and 95 kJ/mol, respectively. The presence of Sn decreases the saturation uptake of hydrogen on the PtSn sample. The initial heats of ethene interaction with Pd/silica and Pt/silica are 170 and 145 kJ/mol, respectively. The presence of Sn decreases the initial heat to 115 kJ/mol on the PtSn sample. The initial heats of Isobutene interaction with silica-supported Pd and Pt are 160 and 190 kJ/mol, respectively. The presence of Sn decreases the initial heat to 125 kJ/mol on the PtSn sample. It appears that ethene and Isobutene adsorb dissociatively on silica-supported Pd and Pt to form alkyHdyne species at 300 K, with an average strength of carbon-metal bonds for these species near 230 kJ/mol. Ethene and Isobutene adsorb on silica-supported PtSn to form di-σ- and π-bonded alkene species at 300 K, with an average strength of carbon-metal bonds for these species near 190 and 130kJ/mol, respectively. Isobutane appears to adsorb dissociatively on a small number of sites on silica-supported Pd and Pt, and this dissociation is also inhibited by Sn on PtSn samples.
Randy D. Cortright - One of the best experts on this subject based on the ideXlab platform.
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Selective dehydrogenation of isobutane over supported Pt/Sn catalysts
Catalysis Today, 2000Co-Authors: Randy D. Cortright, Josephine M. Hill, James A. DumesicAbstract:Catalytic dehydrogenation of isobutane is important because of growing demand for Isobutene as a precursor for the production of oxygenates required in reformulated gasoline. It was found that supporting tin and platinum in K-L-zeolite produces catalysts that exhibit high activity and selectivity for isobutane dehydrogenation. Furthermore, Pt/Sn/K-L-zeolite catalysts exhibit high resistance to deactivation at conditions conducive to high dehydrogenation conversions. Fundamental investigations of silica-supported Pt/Sn catalysts show that tin interacts with platinum to form Pt/Sn alloy particles, which reduces the size of surface Pt ensembles and inhibits the formation of highly dehydrogenated surface species required for the competing isomerization, hydrogenolysis, and coking reactions. Similarly, the addition of potassium to Pt/Sn/SiO2 increases the selectivity for isobutane dehydrogenation by further reducing the size of surface Pt ensembles. © 2000 Elsevier Science B.V. All rights reserved.
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Kinetic studies of isobutane dehydrogenation and Isobutene hydrogenation over Pt/Sn-based catalysts
Industrial and Engineering Chemistry Research, 1998Co-Authors: Randy D. Cortright, Per E. Levin, James A. DumesicAbstract:Rates of isobutane dehydrogenation and Isobutene hydrogenation were measured over Pt/Sn/ SiO 2 , Pt/Sn/K/SiO 2 , and Pt/Sn/K-L-zeolite catalysts at temperatures from 673 to 773 K and at various partial pressures for a total pressure of 1 atm. Addition of potassium to Pt/Sn/SiO 2 enhances the rate of Isobutene hydrogenation and isobutane dehydrogenation, and the Pt/Sn/ K-L-zeolite catalyst exhibits considerably higher rates than Pt/Sn/SiO 2 and Pt/Sn/K/SiO 2 . The kinetic data for the hydrogenation and dehydrogenation reactions over the Pt/Sn catalysts could be described by a four-step Horiuti-Polanyi mechanism, with rate-limiting, dissociative adsorption of isobutane and quasi-equilibrated adsorption of hydrogen and Isobutene. The higher rates observed over Pt/Sn/K/SiO 2 and Pt/Sn/K-L-zeolite may be attributed to stabilization of the activated complex involved in the dissociative adsorption/desorption of isobutane on the Pt/ Sn clusters within the zeolite pore structure and/or stabilization by the presence of potassium.
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Silica- and L-zeolite-supported Pt, Pt/Sn and Pt/Sn/K catalysts for isobutane dehydrogenation
Applied Catalysis A: General, 1998Co-Authors: Josephine M. Hill, Randy D. Cortright, James A. DumesicAbstract:Reaction kinetics measurements, temperature programmed oxidation (TPO), transmission electron microscopy, and chemisorption measurements were used to study silica- and L-zeolite-supported Pt catalysts for isobutane dehydrogenation at 798 K in pure isobutane and at 873 K with a 2 : 1 hydrogen : isobutane feed. Highly selective dehydrogenation catalysts were prepared by depositing Pt and Sn on K-L-zeolite, as well as by depositing Pt, Sn, and K on silica. At 873 K and in the presence of hydrogen, the Pt/Sn/K-L catalysts exhibited significantly higher rates of Isobutene production compared to the Pt/Sn/K/ silica catalyst. Addition of Sn and K to Pt decreased the extent of carbon deposition on the catalysts by reducing the size of the Pt surface ensembles, thereby inhibiting the formation of highly dehydrogenated surface species that lead to coke and other undesirable products (e.g. hydrogenolysis). The presence of Sn may also facilitate the transport of the carbon deposits from the active sites to the support. In the absence of hydrogen, the pores of Pt/K-L-zeolite become blocked by carbonaceous deposits during isobutane dehydrogenation at 798 K. At 873 K and in the presence of hydrogen, the Pt/Sn/K-L catalysts exhibit deactivation due to coking, enrichment of the surface with tin, and/or sintering of the metal particles. © 1998 Elsevier Science B.V.
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Microcalometric studies of interactions of ethene, Isobutene, and isobutane with silica-supported Pd, Pt, and PtSn
Catalysis Letters, 1997Co-Authors: M.a. Natal-santiago, Randy D. Cortright, Simon G Podkolzin, James A. DumesicAbstract:Microcalorimetric measurements were made of the interaction of hydrogen, ethene, Isobutene and isobutane at 300 K with silica-supported Pt, Pd, and PtSn catalysts. The initial heats of hydrogen adsorption on silica-supported Pd and Pt are 104 and 95 kJ/mol, respectively. The presence of Sn decreases the saturation uptake of hydrogen on the PtSn sample. The initial heats of ethene interaction with Pd/silica and Pt/silica are 170 and 145 kJ/mol, respectively. The presence of Sn decreases the initial heat to 115 kJ/mol on the PtSn sample. The initial heats of Isobutene interaction with silica-supported Pd and Pt are 160 and 190 kJ/mol, respectively. The presence of Sn decreases the initial heat to 125 kJ/mol on the PtSn sample. It appears that ethene and Isobutene adsorb dissociatively on silica-supported Pd and Pt to form alkyHdyne species at 300 K, with an average strength of carbon-metal bonds for these species near 230 kJ/mol. Ethene and Isobutene adsorb on silica-supported PtSn to form di-σ- and π-bonded alkene species at 300 K, with an average strength of carbon-metal bonds for these species near 190 and 130kJ/mol, respectively. Isobutane appears to adsorb dissociatively on a small number of sites on silica-supported Pd and Pt, and this dissociation is also inhibited by Sn on PtSn samples.
Sung Hwa Jhung - One of the best experts on this subject based on the ideXlab platform.
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Trimerization of Isobutene Over Solid Acid Catalysts
Catalysis Surveys from Asia, 2009Co-Authors: Sung Hwa Jhung, Jong-san ChangAbstract:Oligomerization of Isobutene is a very promising reaction not only for the production of Isobutene oligomers such as trimers but also for the separation of Isobutene from C_4 mixtures. Several solid acid catalysts have been applied for the continuous oligomerization of Isobutene in liquid phase. This review analyzes the trimerization of Isobutene over various solid acid catalysts such as zeolites, oxides (zirconias and titanias) and acid resins. Trimers selectivity increases with increasing Isobutene conversion, irrespective of catalysts such as zeolites and acid resins. Very stable operation with high trimers selectivity is accomplished with WO_ x /ZrO_2 catalyst having tetragonal zirconia or various zeolite catalysts with high Lewis acid site-to-Brønsted acid site ratio (LA/BA ratio). For a good performance, acid resins should be macroporous and strong acid (sulphonic acid group) with high acid concentration. Inorganic catalysts are superior to acid resins because the deactivated inorganic materials can be regenerated by simple calcination. The WO_ x /ZrO_2 catalyst may be applied to a commercial process because about several thousand tons of Isobutene can be oligomerized per one ton of zirconia catalyst in a catalytic cycle without regeneration. The oligomerization of Isobutene may be improved further because the reaction has been started only recently and no research has been done for the optimization of the reaction and catalysts. It is expected to develop a new inorganic catalyst having suitable acidity, LA/BA ratio and phase, etc. by further research. The Isobutene trimers, with or without hydrogenation, may be used for various purposes, and the importance of this trimerization reaction will be increased considering the expected surplus of Isobutene due to the banned use of methyl- tert -butyl ether.
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trimerization of Isobutene over zeolite catalysts remarkable performance over a ferrierite zeolite
Catalysis Communications, 2007Co-Authors: Ji Woong Yoon, Dae Hyun Choo, Jong-san Chang, Sung Hwa JhungAbstract:Abstract Oligomerization of Isobutene has been investigated using several zeolites in order to produce triIsobutenes that are useful chemical feedstocks for heavy alkylates and neo-acids. Stable Isobutene conversion and high selectivity for trimers are obtained over a ferrierite zeolite at high temperature and low space velocity. Trimers selectivity increases with increasing Isobutene conversion. Isobutene is quantitatively oligomerized over a ferrierite catalyst with selectivity for trimers higher than 60% up to 50 h at high Isobutene WHSV of 10 h −1 . Moreover, a deactivated catalyst can be regenerated easily by calcining in flowing air. The ferrierite zeolite is one of the potential catalysts for the Isobutene trimerization showing high stability, quantitative conversion, high selectivity and easy regeneration.
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Trimerization of Isobutene over zeolite catalysts: Remarkable performance over a ferrierite zeolite
Catalysis Communications, 2007Co-Authors: Ji Woong Yoon, Seong Jun Lee, Dae Hyun Choo, Ji-hye Lee, Jong-san Chang, Sung Hwa JhungAbstract:Oligomerization of Isobutene has been investigated using several zeolites in order to produce triIsobutenes that are useful chemical feedstocks for heavy alkylates and neo-acids. Stable Isobutene conversion and high selectivity for trimers are obtained over a ferrierite zeolite at high temperature and low space velocity. Trimers selectivity increases with increasing Isobutene conversion. Isobutene is quantitatively oligomerized over a ferrierite catalyst with selectivity for trimers higher than 60% up to 50 h at high Isobutene WHSV of 10 h -1 . Moreover, a deactivated catalyst can be regenerated easily by calcining in flowing air. The ferrierite zeolite is one of the potential catalysts for the Isobutene trimerization showing high stability, quantitative conversion, high selectivity and easy regeneration. © 2006 Elsevier B.V. All rights reserved.
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trimerization of Isobutene over a zeolite beta catalyst
Journal of Catalysis, 2007Co-Authors: Ji Woong Yoon, Jong-san Chang, Sung Hwa JhungAbstract:Abstract Oligomerization of Isobutene has been investigated using several zeolite catalysts to produce triIsobutenes that are useful as chemical feedstocks. Stable Isobutene conversion and high selectivity for trimers are attained over a beta zeolite with high concentration of Lewis acid sites. Isobutene is quantitatively oligomerized over a beta zeolite with selectivity for trimers > 50 % up to 100 h at a high Isobutene WHSV of 10 h−1. Moreover, a deactivated catalyst can be easily regenerated by calcining in flowing air. Zeolite beta's high stability, quantitative conversion, high selectivity, and facile regeneration make it an attractive potential catalyst for Isobutene trimerization.
Jong-san Chang - One of the best experts on this subject based on the ideXlab platform.
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Trimerization of Isobutene Over Solid Acid Catalysts
Catalysis Surveys from Asia, 2009Co-Authors: Sung Hwa Jhung, Jong-san ChangAbstract:Oligomerization of Isobutene is a very promising reaction not only for the production of Isobutene oligomers such as trimers but also for the separation of Isobutene from C_4 mixtures. Several solid acid catalysts have been applied for the continuous oligomerization of Isobutene in liquid phase. This review analyzes the trimerization of Isobutene over various solid acid catalysts such as zeolites, oxides (zirconias and titanias) and acid resins. Trimers selectivity increases with increasing Isobutene conversion, irrespective of catalysts such as zeolites and acid resins. Very stable operation with high trimers selectivity is accomplished with WO_ x /ZrO_2 catalyst having tetragonal zirconia or various zeolite catalysts with high Lewis acid site-to-Brønsted acid site ratio (LA/BA ratio). For a good performance, acid resins should be macroporous and strong acid (sulphonic acid group) with high acid concentration. Inorganic catalysts are superior to acid resins because the deactivated inorganic materials can be regenerated by simple calcination. The WO_ x /ZrO_2 catalyst may be applied to a commercial process because about several thousand tons of Isobutene can be oligomerized per one ton of zirconia catalyst in a catalytic cycle without regeneration. The oligomerization of Isobutene may be improved further because the reaction has been started only recently and no research has been done for the optimization of the reaction and catalysts. It is expected to develop a new inorganic catalyst having suitable acidity, LA/BA ratio and phase, etc. by further research. The Isobutene trimers, with or without hydrogenation, may be used for various purposes, and the importance of this trimerization reaction will be increased considering the expected surplus of Isobutene due to the banned use of methyl- tert -butyl ether.
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trimerization of Isobutene over zeolite catalysts remarkable performance over a ferrierite zeolite
Catalysis Communications, 2007Co-Authors: Ji Woong Yoon, Dae Hyun Choo, Jong-san Chang, Sung Hwa JhungAbstract:Abstract Oligomerization of Isobutene has been investigated using several zeolites in order to produce triIsobutenes that are useful chemical feedstocks for heavy alkylates and neo-acids. Stable Isobutene conversion and high selectivity for trimers are obtained over a ferrierite zeolite at high temperature and low space velocity. Trimers selectivity increases with increasing Isobutene conversion. Isobutene is quantitatively oligomerized over a ferrierite catalyst with selectivity for trimers higher than 60% up to 50 h at high Isobutene WHSV of 10 h −1 . Moreover, a deactivated catalyst can be regenerated easily by calcining in flowing air. The ferrierite zeolite is one of the potential catalysts for the Isobutene trimerization showing high stability, quantitative conversion, high selectivity and easy regeneration.
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Trimerization of Isobutene over zeolite catalysts: Remarkable performance over a ferrierite zeolite
Catalysis Communications, 2007Co-Authors: Ji Woong Yoon, Seong Jun Lee, Dae Hyun Choo, Ji-hye Lee, Jong-san Chang, Sung Hwa JhungAbstract:Oligomerization of Isobutene has been investigated using several zeolites in order to produce triIsobutenes that are useful chemical feedstocks for heavy alkylates and neo-acids. Stable Isobutene conversion and high selectivity for trimers are obtained over a ferrierite zeolite at high temperature and low space velocity. Trimers selectivity increases with increasing Isobutene conversion. Isobutene is quantitatively oligomerized over a ferrierite catalyst with selectivity for trimers higher than 60% up to 50 h at high Isobutene WHSV of 10 h -1 . Moreover, a deactivated catalyst can be regenerated easily by calcining in flowing air. The ferrierite zeolite is one of the potential catalysts for the Isobutene trimerization showing high stability, quantitative conversion, high selectivity and easy regeneration. © 2006 Elsevier B.V. All rights reserved.
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trimerization of Isobutene over a zeolite beta catalyst
Journal of Catalysis, 2007Co-Authors: Ji Woong Yoon, Jong-san Chang, Sung Hwa JhungAbstract:Abstract Oligomerization of Isobutene has been investigated using several zeolite catalysts to produce triIsobutenes that are useful as chemical feedstocks. Stable Isobutene conversion and high selectivity for trimers are attained over a beta zeolite with high concentration of Lewis acid sites. Isobutene is quantitatively oligomerized over a beta zeolite with selectivity for trimers > 50 % up to 100 h at a high Isobutene WHSV of 10 h−1. Moreover, a deactivated catalyst can be easily regenerated by calcining in flowing air. Zeolite beta's high stability, quantitative conversion, high selectivity, and facile regeneration make it an attractive potential catalyst for Isobutene trimerization.
Mohammad Reza Rahimpour - One of the best experts on this subject based on the ideXlab platform.
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Optimal conditions of isobutane dehydrogenation in radial flow moving bed hydrogen-permselective membrane reactors to enhance Isobutene and hydrogen production
Chemical Engineering and Processing: Process Intensification, 2014Co-Authors: MOHAMMED FARSI, Abdolhossein Jahanmiri, Mohammad Reza RahimpourAbstract:In the isobutane dehydrogenation process, coupling reaction and separation and optimization of the intensified process can improve the isobutane conversion and selectivity, reduce operational costs and lets to produce pure hydrogen. In this research, the radial flow moving bed reactors in the Olefex technology have been supported by Pd-Ag membrane plate to remove hydrogen from the reaction zone. The reactions occur in the tube side and the hydrogen is permeated from the reaction zone to the sweep gas stream. The proposed configuration has been modeled heterogeneously based on the mass and energy conservation laws considering reaction networks. To prove the accuracy of the considered model, the simulation results of the conventional process have been compared against available plant data. The Genetic algorithm as an effective method in the global optimization has been considered to optimize the operating condition of membrane reactors to enhance Isobutene productivity. In this optimal configuration, the Isobutene production has been enhanced about 3.7%. © 2013.
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Simultaneous Isobutane Dehydrogenation and Hydrogen Production in a Hydrogen–Permselective Membrane Fixed Bed Reactor
Теоретические основы химической технологии, 2014Co-Authors: MOHAMMED FARSI, Abdolhossein Jahanmiri, Mohammad Reza RahimpourAbstract:© 2014, Pleiades Publishing, Ltd. In this study, performance of hydrogen-permselective membrane fixed bed reactors to produce Isobutene is studied at steady state condition. The proposed reactors have been modeled heterogeneously based on the mass and energy conservation laws. The considered reaction networks in the model are Isobutene dehydrogenation as the main reaction, and hydrogenolysis, propane dehydrogenation as well as coke formation as side reactions that all occur on the catalyst surface. The coke deposition on the catalyst surface results an activity profile along reactors. The reactions occur in the tube side and the hydrogen permeates from the reaction zone to the sweep gas stream. Decreasing the hydrogen concentration over the catalyst pellets improves isobutane conversion and Isobutene selectivity. To prove the performance of the proposed configuration, simulation results for membrane process are compared with the conventional process at the same operating condition. In this configuration, the Isobutene production rate is enhanced about 10.81% compared to the conventional process at the same catalyst loading.
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Steady state modeling and simulation of the Oleflex process for isobutane dehydrogenation considering reaction network
Asia-Pacific Journal of Chemical Engineering, 2013Co-Authors: MOHAMMED FARSI, Abdolhossein Jahanmiri, Mohammad Reza RahimpourAbstract:In this study, the performance of moving bed radial flow reactors in Olefex technology to produce Isobutene from isobutane dehydrogenation is studied at steady state condition. The dehydrogenation reactors have been modeled heterogeneously on the basis of the mass and energy governing laws considering a two-dimensional model. In this system, isobutane dehydrogenation, hydrogenolysis, propane dehydrogenation, and coke formation reactions occur on the catalyst surface. The coke deposition on the catalyst surface and the catalyst velocity along the axial direction result to an activity profile along reactors that has been calculated from proper correlation. To prove the accuracy of the considered mathematical model and assumptions, simulation results are compared with the plant data at the same process condition. The isobutane conversion and Isobutene selectivity have been obtained at about 38.53% and 90.76%, respectively, which have good agreement with the plant data.
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Optimal operating conditions of radial flow moving-bed reactors for isobutane dehydrogenation
Journal of Energy Chemistry, 2013Co-Authors: MOHAMMED FARSI, Abdolhossein Jahanmiri, Mohammad Reza RahimpourAbstract:In this study, radial flow moving bed reactors for isobutane dehydrogenation have been modeled and simulated heterogeneously based on mass and energy conservation laws. The considered reaction networks in the model are Isobutene dehydrogenation as main reaction, and hydrogenolysis, propane dehydrogenation as well as coke formation as side reactions that all occur on the catalyst surface. Then, the process condition has been optimized to produce more Isobutene under steady state condition. To prove the accuracy of the considered mathematical model and assumptions, simulation results are compared with the plant data. As a powerful method in the global optimization, the genetic algorithm has been used to optimize the considered objective function. The isobutane conversion and Isobutene selectivity under optimal conditions are about 40.1% and 91%, respectively. © 2013 Dalian Institute of Chemical Physics, the Chinese Academy of Sciences. Published by Elsevier B.V.
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optimal operating condition of membrane reactors to enhance Isobutene production selectivity and hydrogen production
Journal of Industrial and Engineering Chemistry, 2012Co-Authors: MOHAMMED FARSI, Abdolhossein Jahanmiri, Mohammad Reza RahimpourAbstract:Abstract In the Isobutene synthesis process, coupling reaction and separation improves Isobutene production and selectivity, reduces operation cost and lets to produce hydrogen. This study focuses on the steady state optimization of the isobutane dehydrogenation in hydrogen-permselective Pd/Ag based membrane reactors. The membrane reactors have been modeled heterogeneously based on the mass and energy conservation laws at steady state condition. The Genetic algorithm has been considered to optimize the operating condition of membrane reactors. Optimization results of membrane reactors are compared with conventional adiabatic reactors at the same catalyst loading. This optimal configuration has enhanced Isobutene mole fraction about 16.4%.
