Evaluation of bleachability on pine and eucalyptus kraft pulps

Detalhes bibliográficos
Autor(a) principal: Andrade, Marcela Freitas
Data de Publicação: 2016
Outros Autores: Colodette, Jorge Luiz, Oliveira, Flávia Natalino
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFLA
Texto Completo: http://repositorio.ufla.br/jspui/handle/1/14298
Resumo: In recent decades, the pulp industry has been changing and improving its manufacturing processes in order to enhance production capacity, product quality and environmental performance. The aim of this study was to evaluate the bleachability effect on the efficient washing and alkaline leaching in eucalyptus and pine Kraft pulps using three different bleaching sequences: AD(EP)D, A/D(EP)DP and DHT(EP)DP. This study was carried out in two stages. In the first part, the optimum conditions for pulp bleaching in order to achieve a brightness of 90% ISO were established. The second step was a comparative study between the pulps that received alkaline leaching and efficient washing with reference pulp (without treatment). The brightness, viscosity, kappa number and HexA in pulp were analyzed. The three sequences studied reached the desired brightness, but the sequence AD(EP)D produced a lower reagent consumption for the same brightness. In the three sequences studied, the efficient washing of the pulp after oxygen delignification has contributed significantly to the removal of dissolved organic and inorganic materials in the pulp and the alkaline leaching decreased significantly the pulp kappa number due to a higher pulp delignification and bleachability.
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spelling Evaluation of bleachability on pine and eucalyptus kraft pulpsAvaliação da branqueabilidade de polpas kraft de pinus e eucaliptoDeslignificaçãoLixiviação alcalinaLavagem eficienteDelignificationAlkaline leachingEfficient washingIn recent decades, the pulp industry has been changing and improving its manufacturing processes in order to enhance production capacity, product quality and environmental performance. The aim of this study was to evaluate the bleachability effect on the efficient washing and alkaline leaching in eucalyptus and pine Kraft pulps using three different bleaching sequences: AD(EP)D, A/D(EP)DP and DHT(EP)DP. This study was carried out in two stages. In the first part, the optimum conditions for pulp bleaching in order to achieve a brightness of 90% ISO were established. The second step was a comparative study between the pulps that received alkaline leaching and efficient washing with reference pulp (without treatment). The brightness, viscosity, kappa number and HexA in pulp were analyzed. The three sequences studied reached the desired brightness, but the sequence AD(EP)D produced a lower reagent consumption for the same brightness. In the three sequences studied, the efficient washing of the pulp after oxygen delignification has contributed significantly to the removal of dissolved organic and inorganic materials in the pulp and the alkaline leaching decreased significantly the pulp kappa number due to a higher pulp delignification and bleachability.Nas últimas décadas, a indústria de celulose vem modificando e aperfeiçoando os seus processos fabris, com o objetivo de melhorar a sua capacidade de produção, a qualidade de seus produtos e o seu desempenho ambiental. Objetivou-se, neste trabalho, avaliar o efeito da lavagem eficiente e da lixiviação alcalina de polpas Kraft de eucalipto e pinus nas suas branqueabilidades, utilizando-se três diferentes sequências de branqueamento: AD(EP)D, A/D(EP)DP e DHT(EP)DP. O presente trabalho foi realizado em duas etapas. Na primeira parte, foram estabelecidas as condições ótimas de branqueamento da polpa, a fim de se atingir uma alvura de 90% ISO. Na segunda etapa, foi realizado um estudo comparativo entre as polpas que receberam a lixiviação alcalina e a lavagem eficiente com uma polpa de referência que não recebeu esse tratamento. Para a discussão dos resultados, foram realizadas análises de alvura, viscosidade, ácidos hexenurônicos e número kappa na polpa de celulose. As três sequências estudadas atingiram a alvura desejada, mas a sequência AD(EP)D obteve um menor consumo de reagentes para uma mesma alvura. Nas três sequências estudadas, a lavagem eficiente da polpa após a deslignificação com oxigênio contribuiu significativamente com a remoção de materiais orgânico e inorgânico dissolvidos na polpa, e a lixiviação alcalina da polpa reduziu o número kappa significativamente proporcionando uma maior deslignificação e melhor branqueabilidade das polpas de celulósicas.Universidade Federal de Lavras (UFLA)2016-04-062017-08-01T20:14:13Z2017-08-01T20:14:13Z2017-08-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdfANDRADE, M. F.; COLODETTE, J. L.; OLIVEIRA, F. N. Evaluation of bleachability on pine and eucalyptus kraft pulps. CERNE, Lavras, v. 19, n. 3, p. 433-439, jul./set. 2013.http://repositorio.ufla.br/jspui/handle/1/142982317-63420104-7760reponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLAenghttp://www.cerne.ufla.br/site/index.php/CERNE/article/view/922/697Copyright (c) 2016 CERNEhttp://creativecommons.org/licenses/by/4.0/Attribution 4.0 Internationalinfo:eu-repo/semantics/openAccessAndrade, Marcela FreitasColodette, Jorge LuizOliveira, Flávia Natalino2021-05-27T22:53:11Zoai:localhost:1/14298Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2021-05-27T22:53:11Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false
dc.title.none.fl_str_mv Evaluation of bleachability on pine and eucalyptus kraft pulps
Avaliação da branqueabilidade de polpas kraft de pinus e eucalipto
title Evaluation of bleachability on pine and eucalyptus kraft pulps
spellingShingle Evaluation of bleachability on pine and eucalyptus kraft pulps
Andrade, Marcela Freitas
Deslignificação
Lixiviação alcalina
Lavagem eficiente
Delignification
Alkaline leaching
Efficient washing
title_short Evaluation of bleachability on pine and eucalyptus kraft pulps
title_full Evaluation of bleachability on pine and eucalyptus kraft pulps
title_fullStr Evaluation of bleachability on pine and eucalyptus kraft pulps
title_full_unstemmed Evaluation of bleachability on pine and eucalyptus kraft pulps
title_sort Evaluation of bleachability on pine and eucalyptus kraft pulps
author Andrade, Marcela Freitas
author_facet Andrade, Marcela Freitas
Colodette, Jorge Luiz
Oliveira, Flávia Natalino
author_role author
author2 Colodette, Jorge Luiz
Oliveira, Flávia Natalino
author2_role author
author
dc.contributor.author.fl_str_mv Andrade, Marcela Freitas
Colodette, Jorge Luiz
Oliveira, Flávia Natalino
dc.subject.por.fl_str_mv Deslignificação
Lixiviação alcalina
Lavagem eficiente
Delignification
Alkaline leaching
Efficient washing
topic Deslignificação
Lixiviação alcalina
Lavagem eficiente
Delignification
Alkaline leaching
Efficient washing
description In recent decades, the pulp industry has been changing and improving its manufacturing processes in order to enhance production capacity, product quality and environmental performance. The aim of this study was to evaluate the bleachability effect on the efficient washing and alkaline leaching in eucalyptus and pine Kraft pulps using three different bleaching sequences: AD(EP)D, A/D(EP)DP and DHT(EP)DP. This study was carried out in two stages. In the first part, the optimum conditions for pulp bleaching in order to achieve a brightness of 90% ISO were established. The second step was a comparative study between the pulps that received alkaline leaching and efficient washing with reference pulp (without treatment). The brightness, viscosity, kappa number and HexA in pulp were analyzed. The three sequences studied reached the desired brightness, but the sequence AD(EP)D produced a lower reagent consumption for the same brightness. In the three sequences studied, the efficient washing of the pulp after oxygen delignification has contributed significantly to the removal of dissolved organic and inorganic materials in the pulp and the alkaline leaching decreased significantly the pulp kappa number due to a higher pulp delignification and bleachability.
publishDate 2016
dc.date.none.fl_str_mv 2016-04-06
2017-08-01T20:14:13Z
2017-08-01T20:14:13Z
2017-08-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv ANDRADE, M. F.; COLODETTE, J. L.; OLIVEIRA, F. N. Evaluation of bleachability on pine and eucalyptus kraft pulps. CERNE, Lavras, v. 19, n. 3, p. 433-439, jul./set. 2013.
http://repositorio.ufla.br/jspui/handle/1/14298
identifier_str_mv ANDRADE, M. F.; COLODETTE, J. L.; OLIVEIRA, F. N. Evaluation of bleachability on pine and eucalyptus kraft pulps. CERNE, Lavras, v. 19, n. 3, p. 433-439, jul./set. 2013.
url http://repositorio.ufla.br/jspui/handle/1/14298
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv http://www.cerne.ufla.br/site/index.php/CERNE/article/view/922/697
dc.rights.driver.fl_str_mv Copyright (c) 2016 CERNE
http://creativecommons.org/licenses/by/4.0/
Attribution 4.0 International
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Copyright (c) 2016 CERNE
http://creativecommons.org/licenses/by/4.0/
Attribution 4.0 International
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Universidade Federal de Lavras (UFLA)
publisher.none.fl_str_mv Universidade Federal de Lavras (UFLA)
dc.source.none.fl_str_mv 2317-6342
0104-7760
reponame:Repositório Institucional da UFLA
instname:Universidade Federal de Lavras (UFLA)
instacron:UFLA
instname_str Universidade Federal de Lavras (UFLA)
instacron_str UFLA
institution UFLA
reponame_str Repositório Institucional da UFLA
collection Repositório Institucional da UFLA
repository.name.fl_str_mv Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)
repository.mail.fl_str_mv nivaldo@ufla.br || repositorio.biblioteca@ufla.br
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