Reverse-flow reactor for a selective oxidation process

Detalhes bibliográficos
Autor(a) principal: Ferreira, R. Quinta
Data de Publicação: 1999
Outros Autores: Costa, C. Almeida, Masetti, S.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10316/3838
https://doi.org/10.1016/S0009-2509(99)00161-X
Resumo: The simulation of a reverse-flow operation of a fixed-bed catalytic reactor, where the highly exothermal partial oxidation of o-xylene to phthalic anhydride is processed, is accomplished by using a heterogeneous one-dimensional model, which accounts for mass transport by diffusion and convection inside large-pore catalytic particles. The dynamic behaviour of the reactor is analysed by varying the inlet conditions and the switching period. This work points out the benefits that can arise from the use of the reverse-flow operation, namely the decrease of the hot-spot temperature and the more favourable temperature distribution along the bed. In spite of the lower temperature profiles, the final conversion, as well as selectivity and yield of phthalic anhydride are not significantly affected. The results predicted by the heterogeneous model with intraparticle convection and diffusion, HTdc model, are compared with those obtained when diffusion is the only transport mechanism inside the catalyst, HTd model. A comparison with the simple pseudo-homogeneous model, PH, is also achieved.
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spelling Reverse-flow reactor for a selective oxidation processReverse-flow operationUnsteady-state catalytic processNon-adiabatic fixed-bed reactorPartial oxidationMathematical modellingIntraparticle convectionThe simulation of a reverse-flow operation of a fixed-bed catalytic reactor, where the highly exothermal partial oxidation of o-xylene to phthalic anhydride is processed, is accomplished by using a heterogeneous one-dimensional model, which accounts for mass transport by diffusion and convection inside large-pore catalytic particles. The dynamic behaviour of the reactor is analysed by varying the inlet conditions and the switching period. This work points out the benefits that can arise from the use of the reverse-flow operation, namely the decrease of the hot-spot temperature and the more favourable temperature distribution along the bed. In spite of the lower temperature profiles, the final conversion, as well as selectivity and yield of phthalic anhydride are not significantly affected. The results predicted by the heterogeneous model with intraparticle convection and diffusion, HTdc model, are compared with those obtained when diffusion is the only transport mechanism inside the catalyst, HTd model. A comparison with the simple pseudo-homogeneous model, PH, is also achieved.http://www.sciencedirect.com/science/article/B6TFK-3WY9XKF-16/1/a646afbc3255fee24baea77f5b8e94c11999info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleaplication/PDFhttp://hdl.handle.net/10316/3838http://hdl.handle.net/10316/3838https://doi.org/10.1016/S0009-2509(99)00161-XengChemical Engineering Science. 54:20 (1999) 4615-4627Ferreira, R. QuintaCosta, C. AlmeidaMasetti, S.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2020-11-06T16:59:28Zoai:estudogeral.uc.pt:10316/3838Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:59:20.891247Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Reverse-flow reactor for a selective oxidation process
title Reverse-flow reactor for a selective oxidation process
spellingShingle Reverse-flow reactor for a selective oxidation process
Ferreira, R. Quinta
Reverse-flow operation
Unsteady-state catalytic process
Non-adiabatic fixed-bed reactor
Partial oxidation
Mathematical modelling
Intraparticle convection
title_short Reverse-flow reactor for a selective oxidation process
title_full Reverse-flow reactor for a selective oxidation process
title_fullStr Reverse-flow reactor for a selective oxidation process
title_full_unstemmed Reverse-flow reactor for a selective oxidation process
title_sort Reverse-flow reactor for a selective oxidation process
author Ferreira, R. Quinta
author_facet Ferreira, R. Quinta
Costa, C. Almeida
Masetti, S.
author_role author
author2 Costa, C. Almeida
Masetti, S.
author2_role author
author
dc.contributor.author.fl_str_mv Ferreira, R. Quinta
Costa, C. Almeida
Masetti, S.
dc.subject.por.fl_str_mv Reverse-flow operation
Unsteady-state catalytic process
Non-adiabatic fixed-bed reactor
Partial oxidation
Mathematical modelling
Intraparticle convection
topic Reverse-flow operation
Unsteady-state catalytic process
Non-adiabatic fixed-bed reactor
Partial oxidation
Mathematical modelling
Intraparticle convection
description The simulation of a reverse-flow operation of a fixed-bed catalytic reactor, where the highly exothermal partial oxidation of o-xylene to phthalic anhydride is processed, is accomplished by using a heterogeneous one-dimensional model, which accounts for mass transport by diffusion and convection inside large-pore catalytic particles. The dynamic behaviour of the reactor is analysed by varying the inlet conditions and the switching period. This work points out the benefits that can arise from the use of the reverse-flow operation, namely the decrease of the hot-spot temperature and the more favourable temperature distribution along the bed. In spite of the lower temperature profiles, the final conversion, as well as selectivity and yield of phthalic anhydride are not significantly affected. The results predicted by the heterogeneous model with intraparticle convection and diffusion, HTdc model, are compared with those obtained when diffusion is the only transport mechanism inside the catalyst, HTd model. A comparison with the simple pseudo-homogeneous model, PH, is also achieved.
publishDate 1999
dc.date.none.fl_str_mv 1999
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10316/3838
http://hdl.handle.net/10316/3838
https://doi.org/10.1016/S0009-2509(99)00161-X
url http://hdl.handle.net/10316/3838
https://doi.org/10.1016/S0009-2509(99)00161-X
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Chemical Engineering Science. 54:20 (1999) 4615-4627
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv aplication/PDF
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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instacron_str RCAAP
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reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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