Molar Heat Capacity of 1,2-Cyclohexanediol Isomers From (173 to 428) K
Autor(a) principal: | |
---|---|
Data de Publicação: | 2008 |
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/10316/10388 https://doi.org/10.1021/je800047t |
Resumo: | Heat capacities of cis-1,2-cyclohexanediol and trans-1,2-cyclohexanediol enantiomers have been determined in the solid state in the temperature range T = (173 to 368) K for the cis-isomer and T = (173 to 373) K in the case of the trans-isomer and in the liquid state at temperatures up to 428 K. Measurements were carried out by differential scanning calorimetry using the enthalpic method. For the cis-isomer, the results show that, before the liquid state is reached, a highly disordered phase is formed. The trans-enantiomers show only a one-step fusion process. The values obtained for the solids are quite well predicted by Goodman’s power law group contribution method, except for the lower temperatures. The Rika method was tested for the prediction of liquid state heat capacity values giving results (15 to 20) % lower than the experimental values. |
id |
RCAP_ec1a63feb38573f72bc093ffa3d1ecd9 |
---|---|
oai_identifier_str |
oai:estudogeral.uc.pt:10316/10388 |
network_acronym_str |
RCAP |
network_name_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository_id_str |
7160 |
spelling |
Molar Heat Capacity of 1,2-Cyclohexanediol Isomers From (173 to 428) KHeat capacities of cis-1,2-cyclohexanediol and trans-1,2-cyclohexanediol enantiomers have been determined in the solid state in the temperature range T = (173 to 368) K for the cis-isomer and T = (173 to 373) K in the case of the trans-isomer and in the liquid state at temperatures up to 428 K. Measurements were carried out by differential scanning calorimetry using the enthalpic method. For the cis-isomer, the results show that, before the liquid state is reached, a highly disordered phase is formed. The trans-enantiomers show only a one-step fusion process. The values obtained for the solids are quite well predicted by Goodman’s power law group contribution method, except for the lower temperatures. The Rika method was tested for the prediction of liquid state heat capacity values giving results (15 to 20) % lower than the experimental values.American Chemical Society2008-06-12info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/10388http://hdl.handle.net/10316/10388https://doi.org/10.1021/je800047tengJournal of Chemical & Engineering Data. 53:6 (2008) 1316-13200021-9568Maria, Teresa M. R.Eusébio, M. Ermelinda 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:RCAAP2020-05-25T13:13:37Zoai:estudogeral.uc.pt:10316/10388Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:01:15.332845Repositório 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 |
Molar Heat Capacity of 1,2-Cyclohexanediol Isomers From (173 to 428) K |
title |
Molar Heat Capacity of 1,2-Cyclohexanediol Isomers From (173 to 428) K |
spellingShingle |
Molar Heat Capacity of 1,2-Cyclohexanediol Isomers From (173 to 428) K Maria, Teresa M. R. |
title_short |
Molar Heat Capacity of 1,2-Cyclohexanediol Isomers From (173 to 428) K |
title_full |
Molar Heat Capacity of 1,2-Cyclohexanediol Isomers From (173 to 428) K |
title_fullStr |
Molar Heat Capacity of 1,2-Cyclohexanediol Isomers From (173 to 428) K |
title_full_unstemmed |
Molar Heat Capacity of 1,2-Cyclohexanediol Isomers From (173 to 428) K |
title_sort |
Molar Heat Capacity of 1,2-Cyclohexanediol Isomers From (173 to 428) K |
author |
Maria, Teresa M. R. |
author_facet |
Maria, Teresa M. R. Eusébio, M. Ermelinda S. |
author_role |
author |
author2 |
Eusébio, M. Ermelinda S. |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Maria, Teresa M. R. Eusébio, M. Ermelinda S. |
description |
Heat capacities of cis-1,2-cyclohexanediol and trans-1,2-cyclohexanediol enantiomers have been determined in the solid state in the temperature range T = (173 to 368) K for the cis-isomer and T = (173 to 373) K in the case of the trans-isomer and in the liquid state at temperatures up to 428 K. Measurements were carried out by differential scanning calorimetry using the enthalpic method. For the cis-isomer, the results show that, before the liquid state is reached, a highly disordered phase is formed. The trans-enantiomers show only a one-step fusion process. The values obtained for the solids are quite well predicted by Goodman’s power law group contribution method, except for the lower temperatures. The Rika method was tested for the prediction of liquid state heat capacity values giving results (15 to 20) % lower than the experimental values. |
publishDate |
2008 |
dc.date.none.fl_str_mv |
2008-06-12 |
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/10316/10388 http://hdl.handle.net/10316/10388 https://doi.org/10.1021/je800047t |
url |
http://hdl.handle.net/10316/10388 https://doi.org/10.1021/je800047t |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Chemical & Engineering Data. 53:6 (2008) 1316-1320 0021-9568 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
American Chemical Society |
publisher.none.fl_str_mv |
American Chemical Society |
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 |
|
_version_ |
1799133904796385280 |