Effect of unbleached pulp kappa number on the kinetics of chlorine dioxide delignification

Detalhes bibliográficos
Autor(a) principal: Simões, Rogério
Data de Publicação: 2001
Outros Autores: Barroca, Maria J. M. C., Castro, José Almiro A. M.
Tipo de documento: Artigo
Idioma: por
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.6/576
Resumo: Chlorine dioxide delignification of different unbleached kraft pulps from Eucalyptus globulus, having Kappa numbers of 12 to 18, was studied in the temperature range of 285 K to 358 K. The effect of the unbleached pulp Kappa number on the initial fast phase of delignification was investigated with respect to the depletion factors for Kappa number and chlorine dioxide concentration, as proposed by Barroca et al. Furthermore, the behaviour of the floor lignin content of the pulp, or the floor Kappa number, was analysed within this range. The results show that all pulps exhibit a similar pattern, with respect to temperature, in depletion factors for Kappa number and chlorine dioxide concentration. The degree of normalised delignification and chlorine dioxide consumption is very similar and independent of the Kappa number of the unbleached pulps. Moreover, the results reveal that there is a strong correlation between the floor lignin content and the temperature, and that this correlation is applicable to a wide range of unbleached pulp Kappa numbers, since the residual Kappa number is independent of its initial value. The results enable the general application of a kinetic model to kraft pulps with different unbleached Kappa numbers.
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spelling Effect of unbleached pulp kappa number on the kinetics of chlorine dioxide delignificationBleachingEucalyptus globulusKraft pulpKineticsChlorine dioxideMathematical modelUnbleached pulp kappa numberFloor kappa numberChlorine dioxide delignification of different unbleached kraft pulps from Eucalyptus globulus, having Kappa numbers of 12 to 18, was studied in the temperature range of 285 K to 358 K. The effect of the unbleached pulp Kappa number on the initial fast phase of delignification was investigated with respect to the depletion factors for Kappa number and chlorine dioxide concentration, as proposed by Barroca et al. Furthermore, the behaviour of the floor lignin content of the pulp, or the floor Kappa number, was analysed within this range. The results show that all pulps exhibit a similar pattern, with respect to temperature, in depletion factors for Kappa number and chlorine dioxide concentration. The degree of normalised delignification and chlorine dioxide consumption is very similar and independent of the Kappa number of the unbleached pulps. Moreover, the results reveal that there is a strong correlation between the floor lignin content and the temperature, and that this correlation is applicable to a wide range of unbleached pulp Kappa numbers, since the residual Kappa number is independent of its initial value. The results enable the general application of a kinetic model to kraft pulps with different unbleached Kappa numbers.uBibliorumSimões, RogérioBarroca, Maria J. M. C.Castro, José Almiro A. M.2010-04-28T10:07:00Z20012001-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.6/576porinfo: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:RCAAP2023-12-15T09:35:48Zoai:ubibliorum.ubi.pt:10400.6/576Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T00:42:37.040344Repositório 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 Effect of unbleached pulp kappa number on the kinetics of chlorine dioxide delignification
title Effect of unbleached pulp kappa number on the kinetics of chlorine dioxide delignification
spellingShingle Effect of unbleached pulp kappa number on the kinetics of chlorine dioxide delignification
Simões, Rogério
Bleaching
Eucalyptus globulus
Kraft pulp
Kinetics
Chlorine dioxide
Mathematical model
Unbleached pulp kappa number
Floor kappa number
title_short Effect of unbleached pulp kappa number on the kinetics of chlorine dioxide delignification
title_full Effect of unbleached pulp kappa number on the kinetics of chlorine dioxide delignification
title_fullStr Effect of unbleached pulp kappa number on the kinetics of chlorine dioxide delignification
title_full_unstemmed Effect of unbleached pulp kappa number on the kinetics of chlorine dioxide delignification
title_sort Effect of unbleached pulp kappa number on the kinetics of chlorine dioxide delignification
author Simões, Rogério
author_facet Simões, Rogério
Barroca, Maria J. M. C.
Castro, José Almiro A. M.
author_role author
author2 Barroca, Maria J. M. C.
Castro, José Almiro A. M.
author2_role author
author
dc.contributor.none.fl_str_mv uBibliorum
dc.contributor.author.fl_str_mv Simões, Rogério
Barroca, Maria J. M. C.
Castro, José Almiro A. M.
dc.subject.por.fl_str_mv Bleaching
Eucalyptus globulus
Kraft pulp
Kinetics
Chlorine dioxide
Mathematical model
Unbleached pulp kappa number
Floor kappa number
topic Bleaching
Eucalyptus globulus
Kraft pulp
Kinetics
Chlorine dioxide
Mathematical model
Unbleached pulp kappa number
Floor kappa number
description Chlorine dioxide delignification of different unbleached kraft pulps from Eucalyptus globulus, having Kappa numbers of 12 to 18, was studied in the temperature range of 285 K to 358 K. The effect of the unbleached pulp Kappa number on the initial fast phase of delignification was investigated with respect to the depletion factors for Kappa number and chlorine dioxide concentration, as proposed by Barroca et al. Furthermore, the behaviour of the floor lignin content of the pulp, or the floor Kappa number, was analysed within this range. The results show that all pulps exhibit a similar pattern, with respect to temperature, in depletion factors for Kappa number and chlorine dioxide concentration. The degree of normalised delignification and chlorine dioxide consumption is very similar and independent of the Kappa number of the unbleached pulps. Moreover, the results reveal that there is a strong correlation between the floor lignin content and the temperature, and that this correlation is applicable to a wide range of unbleached pulp Kappa numbers, since the residual Kappa number is independent of its initial value. The results enable the general application of a kinetic model to kraft pulps with different unbleached Kappa numbers.
publishDate 2001
dc.date.none.fl_str_mv 2001
2001-01-01T00:00:00Z
2010-04-28T10:07:00Z
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format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.6/576
url http://hdl.handle.net/10400.6/576
dc.language.iso.fl_str_mv por
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