Properties of extracted Eucalyptus globulus kraft pulps

Detalhes bibliográficos
Autor(a) principal: Duarte, G. V.
Data de Publicação: 2012
Outros Autores: Gamelas, J. A. F., Ramarao, B. F., Amidon, T. E., Ferreira, P. J.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10316/19959
Resumo: This work was a comprehensive study of the properties of extracted Eucalyptus globulus kraft pulps. Five levels of hot water extraction were performed, each followed by kraft cooking to three different kappa numbers. As extraction took place, the hemicelluloses content of the kraft pulps was reduced from 21%-22% to 3%-4% and, conversely, the cellulose fraction increased from 73%-75% to 85%-90%. Fiber length decreased for all pulps and kink index increased greatly with extraction. The dispersive components of the surface energy for the control (unextracted) and extracted (120 min) kappa no. 15 kraft pulps, as determined by inverse gas chromatography, were found to be 30.8 and 34.9 mJ/m2, respectively. The acid-base properties of the pulp surface seemed to be enhanced by the inclusion of the hot-water extraction step. We discuss the surface energy properties in terms of the chemical structure of the pulps. In addition, we report on two models able to predict the mass removal and kappa number of pulps prepared from preextracted chips. Application: This work can give mills an understanding of the effect of hot water extraction on the properties of E. globulus kraft pulps.
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spelling Properties of extracted Eucalyptus globulus kraft pulpsProperties of extracted Eucalyptus globulus kraft pulpsHot water extractionEucalyptus globulus kraft pulpsThis work was a comprehensive study of the properties of extracted Eucalyptus globulus kraft pulps. Five levels of hot water extraction were performed, each followed by kraft cooking to three different kappa numbers. As extraction took place, the hemicelluloses content of the kraft pulps was reduced from 21%-22% to 3%-4% and, conversely, the cellulose fraction increased from 73%-75% to 85%-90%. Fiber length decreased for all pulps and kink index increased greatly with extraction. The dispersive components of the surface energy for the control (unextracted) and extracted (120 min) kappa no. 15 kraft pulps, as determined by inverse gas chromatography, were found to be 30.8 and 34.9 mJ/m2, respectively. The acid-base properties of the pulp surface seemed to be enhanced by the inclusion of the hot-water extraction step. We discuss the surface energy properties in terms of the chemical structure of the pulps. In addition, we report on two models able to predict the mass removal and kappa number of pulps prepared from preextracted chips. Application: This work can give mills an understanding of the effect of hot water extraction on the properties of E. globulus kraft pulps.TAPPI : The leading association for the worldwide pulp, paper, packaging and converting industries2012info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/19959http://hdl.handle.net/10316/19959engDUARTE, G.V.; GAMELAS, J.A.F.; RAMARAO, B.V.; AMIDON, T.E.; FERREIRA, P.J. - Properties of extracted Eucalyptus globulus kraft pulps. "TAPPI Journal". ISSN 0734-1415. Vol. 11, nº 4 (2012) p. 47-550734-1415Duarte, G. V.Gamelas, J. A. F.Ramarao, B. F.Amidon, T. E.Ferreira, P. J.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:RCAAP2020-05-29T09:42:36Zoai:estudogeral.uc.pt:10316/19959Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:59:14.279489Repositório 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 Properties of extracted Eucalyptus globulus kraft pulps
title Properties of extracted Eucalyptus globulus kraft pulps
spellingShingle Properties of extracted Eucalyptus globulus kraft pulps
Duarte, G. V.
Properties of extracted Eucalyptus globulus kraft pulps
Hot water extraction
Eucalyptus globulus kraft pulps
title_short Properties of extracted Eucalyptus globulus kraft pulps
title_full Properties of extracted Eucalyptus globulus kraft pulps
title_fullStr Properties of extracted Eucalyptus globulus kraft pulps
title_full_unstemmed Properties of extracted Eucalyptus globulus kraft pulps
title_sort Properties of extracted Eucalyptus globulus kraft pulps
author Duarte, G. V.
author_facet Duarte, G. V.
Gamelas, J. A. F.
Ramarao, B. F.
Amidon, T. E.
Ferreira, P. J.
author_role author
author2 Gamelas, J. A. F.
Ramarao, B. F.
Amidon, T. E.
Ferreira, P. J.
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Duarte, G. V.
Gamelas, J. A. F.
Ramarao, B. F.
Amidon, T. E.
Ferreira, P. J.
dc.subject.por.fl_str_mv Properties of extracted Eucalyptus globulus kraft pulps
Hot water extraction
Eucalyptus globulus kraft pulps
topic Properties of extracted Eucalyptus globulus kraft pulps
Hot water extraction
Eucalyptus globulus kraft pulps
description This work was a comprehensive study of the properties of extracted Eucalyptus globulus kraft pulps. Five levels of hot water extraction were performed, each followed by kraft cooking to three different kappa numbers. As extraction took place, the hemicelluloses content of the kraft pulps was reduced from 21%-22% to 3%-4% and, conversely, the cellulose fraction increased from 73%-75% to 85%-90%. Fiber length decreased for all pulps and kink index increased greatly with extraction. The dispersive components of the surface energy for the control (unextracted) and extracted (120 min) kappa no. 15 kraft pulps, as determined by inverse gas chromatography, were found to be 30.8 and 34.9 mJ/m2, respectively. The acid-base properties of the pulp surface seemed to be enhanced by the inclusion of the hot-water extraction step. We discuss the surface energy properties in terms of the chemical structure of the pulps. In addition, we report on two models able to predict the mass removal and kappa number of pulps prepared from preextracted chips. Application: This work can give mills an understanding of the effect of hot water extraction on the properties of E. globulus kraft pulps.
publishDate 2012
dc.date.none.fl_str_mv 2012
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/10316/19959
http://hdl.handle.net/10316/19959
url http://hdl.handle.net/10316/19959
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv DUARTE, G.V.; GAMELAS, J.A.F.; RAMARAO, B.V.; AMIDON, T.E.; FERREIRA, P.J. - Properties of extracted Eucalyptus globulus kraft pulps. "TAPPI Journal". ISSN 0734-1415. Vol. 11, nº 4 (2012) p. 47-55
0734-1415
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv TAPPI : The leading association for the worldwide pulp, paper, packaging and converting industries
publisher.none.fl_str_mv TAPPI : The leading association for the worldwide pulp, paper, packaging and converting industries
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
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