Mutual diffusivity in binary mixtures of n-heptane with n-hexane isomers
Autor(a) principal: | |
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Data de Publicação: | 1989 |
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/10400.2/2082 |
Resumo: | This paper presents a study of the influence of branching in the binary diffusion coefficients of n-heptane+n-hexane isomers, in the liquid state. The measurements have been made with the Taylor dispersion technique, at several compositions, at 283 and 298 K, for the X+n-heptane mixtures, where X=n-hexane, 3-methylpentane, 2, 3-dimethylbutane, and 2, 2-dimethylbutane. The results show a very interesting behavior of the composition dependence of the binary diffusion coefficients, presenting a maximum, for compositions about a molar fraction of n-heptane of 0.5, which increases with the increase in the degree of branching, suggesting the possibility of order~tisorder effects caused by stereochemically favored packing in the liquid phase and energetically favored segment interaction in the liquid mixtures. An attempt to apply the van der Waals model to these data could not predict the experimental binary diffusion coefficients of these systems within the experimental accuracy. |
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Mutual diffusivity in binary mixtures of n-heptane with n-hexane isomersBinary diffusion2,2-dimethylbutane2,3-dimethylbutanen-heptanen-hexaneliquid mixtures3-methylpentaneTaylor dispersionThis paper presents a study of the influence of branching in the binary diffusion coefficients of n-heptane+n-hexane isomers, in the liquid state. The measurements have been made with the Taylor dispersion technique, at several compositions, at 283 and 298 K, for the X+n-heptane mixtures, where X=n-hexane, 3-methylpentane, 2, 3-dimethylbutane, and 2, 2-dimethylbutane. The results show a very interesting behavior of the composition dependence of the binary diffusion coefficients, presenting a maximum, for compositions about a molar fraction of n-heptane of 0.5, which increases with the increase in the degree of branching, suggesting the possibility of order~tisorder effects caused by stereochemically favored packing in the liquid phase and energetically favored segment interaction in the liquid mixtures. An attempt to apply the van der Waals model to these data could not predict the experimental binary diffusion coefficients of these systems within the experimental accuracy.Repositório AbertoOliveira, Carla Padrel deFareleira, João M. N. A.Castro, C. A. Nieto de2012-03-16T12:59:51Z19891989-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.2/2082engOliveira, Carla Padrel de; Fareleira, João M. N. A.; Castro, C. A. Nieto de - Mutual diffusivity in binary mixtures of n-heptane with n-hexane isomers. "International Journal of Thermophysics". Vol. 10, Nº 5 (1989), p. 973-9820195-928X (Print)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:RCAAP2023-11-16T15:15:27Zoai:repositorioaberto.uab.pt:10400.2/2082Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T22:43:41.224661Repositório 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 |
Mutual diffusivity in binary mixtures of n-heptane with n-hexane isomers |
title |
Mutual diffusivity in binary mixtures of n-heptane with n-hexane isomers |
spellingShingle |
Mutual diffusivity in binary mixtures of n-heptane with n-hexane isomers Oliveira, Carla Padrel de Binary diffusion 2,2-dimethylbutane 2,3-dimethylbutane n-heptane n-hexane liquid mixtures 3-methylpentane Taylor dispersion |
title_short |
Mutual diffusivity in binary mixtures of n-heptane with n-hexane isomers |
title_full |
Mutual diffusivity in binary mixtures of n-heptane with n-hexane isomers |
title_fullStr |
Mutual diffusivity in binary mixtures of n-heptane with n-hexane isomers |
title_full_unstemmed |
Mutual diffusivity in binary mixtures of n-heptane with n-hexane isomers |
title_sort |
Mutual diffusivity in binary mixtures of n-heptane with n-hexane isomers |
author |
Oliveira, Carla Padrel de |
author_facet |
Oliveira, Carla Padrel de Fareleira, João M. N. A. Castro, C. A. Nieto de |
author_role |
author |
author2 |
Fareleira, João M. N. A. Castro, C. A. Nieto de |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Repositório Aberto |
dc.contributor.author.fl_str_mv |
Oliveira, Carla Padrel de Fareleira, João M. N. A. Castro, C. A. Nieto de |
dc.subject.por.fl_str_mv |
Binary diffusion 2,2-dimethylbutane 2,3-dimethylbutane n-heptane n-hexane liquid mixtures 3-methylpentane Taylor dispersion |
topic |
Binary diffusion 2,2-dimethylbutane 2,3-dimethylbutane n-heptane n-hexane liquid mixtures 3-methylpentane Taylor dispersion |
description |
This paper presents a study of the influence of branching in the binary diffusion coefficients of n-heptane+n-hexane isomers, in the liquid state. The measurements have been made with the Taylor dispersion technique, at several compositions, at 283 and 298 K, for the X+n-heptane mixtures, where X=n-hexane, 3-methylpentane, 2, 3-dimethylbutane, and 2, 2-dimethylbutane. The results show a very interesting behavior of the composition dependence of the binary diffusion coefficients, presenting a maximum, for compositions about a molar fraction of n-heptane of 0.5, which increases with the increase in the degree of branching, suggesting the possibility of order~tisorder effects caused by stereochemically favored packing in the liquid phase and energetically favored segment interaction in the liquid mixtures. An attempt to apply the van der Waals model to these data could not predict the experimental binary diffusion coefficients of these systems within the experimental accuracy. |
publishDate |
1989 |
dc.date.none.fl_str_mv |
1989 1989-01-01T00:00:00Z 2012-03-16T12:59:51Z |
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/10400.2/2082 |
url |
http://hdl.handle.net/10400.2/2082 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Oliveira, Carla Padrel de; Fareleira, João M. N. A.; Castro, C. A. Nieto de - Mutual diffusivity in binary mixtures of n-heptane with n-hexane isomers. "International Journal of Thermophysics". Vol. 10, Nº 5 (1989), p. 973-982 0195-928X (Print) |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/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 |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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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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1799135004718006272 |