Reverse-flow reactor for a selective oxidation process
Autor(a) principal: | |
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Data de Publicação: | 1999 |
Outros Autores: | , |
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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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 instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
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 |
repository.mail.fl_str_mv |
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1799133884226469888 |