EFFECT OF WOOD DISSOLVED SOLIDS ON BLEACHABILITY AND PHYSICAL, MECHANICAL AND OPTICAL PROPERTIES OF Eucalyptus BLEACHED PULP

Detalhes bibliográficos
Autor(a) principal: Júnior, Dalton Longue
Data de Publicação: 2012
Outros Autores: Colodette, Jorge Luiz
Tipo de documento: Artigo
Idioma: por
Título da fonte: Ciência Florestal (Online)
Texto Completo: https://periodicos.ufsm.br/cienciaflorestal/article/view/5089
Resumo: http://dx.doi.org/10.5902/198050985089Many studies have shown that the yield of kraft pulping can be improved by xylan reabsorption to the pulp during the cooking, and kraft black liquor contains significant fraction of xylan from wood, an important source of these macromolecules. However, the effect of this technique in the physical-mechanical and optical properties of bleached eucalyptus pulp is not very clear. This study produced pulp from eucalyptus kraft conventional cooking with different additions of black liquor (0, 25, 50, 75 and 100% v/v). The cooking was conducted to kappa number 17-18 and the resulting pulps were de-lignified with oxygen in fixed conditions. Bleaching was performed using a sequence DHT (EP) DP to end whiteness 92% ISO. Next pulps were refined in a PFI mill at different levels of revolutions (0, 500, 1,500, 3,000 and 6,000) and tests of tear resistance, bursting and the air flow, elongation, opacity, density, apparent specific volume, Klemm capillary and water retention value (WRV). The efficiency and brightness gain of the pre-delignification were slightly affected by the addition of black liquor in kraft pulping. The addition of 50% of black liquor to cooking resulted in a worse pulp ability for bleaching, and the chlorine demand increased by 5.3 kg/t pulp oven dry to obtain 92% ISO brightness. The physical-mechanical and optical properties bleached kraft pulps were not influenced significantly by the use of black liquor in cooking.
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spelling EFFECT OF WOOD DISSOLVED SOLIDS ON BLEACHABILITY AND PHYSICAL, MECHANICAL AND OPTICAL PROPERTIES OF Eucalyptus BLEACHED PULPEfeito dos sólidos dissolvidos da madeira na branqueabilidade e nas propriedades físico-mecânicas e ópticas de polpa kraft branqueada de eucaliptohemi-cellulose removalxylansbleachingphysical-mechanical propertiesremoção de hemicelulosesxilanasbranqueamentopropriedades físico-mecânicashttp://dx.doi.org/10.5902/198050985089Many studies have shown that the yield of kraft pulping can be improved by xylan reabsorption to the pulp during the cooking, and kraft black liquor contains significant fraction of xylan from wood, an important source of these macromolecules. However, the effect of this technique in the physical-mechanical and optical properties of bleached eucalyptus pulp is not very clear. This study produced pulp from eucalyptus kraft conventional cooking with different additions of black liquor (0, 25, 50, 75 and 100% v/v). The cooking was conducted to kappa number 17-18 and the resulting pulps were de-lignified with oxygen in fixed conditions. Bleaching was performed using a sequence DHT (EP) DP to end whiteness 92% ISO. Next pulps were refined in a PFI mill at different levels of revolutions (0, 500, 1,500, 3,000 and 6,000) and tests of tear resistance, bursting and the air flow, elongation, opacity, density, apparent specific volume, Klemm capillary and water retention value (WRV). The efficiency and brightness gain of the pre-delignification were slightly affected by the addition of black liquor in kraft pulping. The addition of 50% of black liquor to cooking resulted in a worse pulp ability for bleaching, and the chlorine demand increased by 5.3 kg/t pulp oven dry to obtain 92% ISO brightness. The physical-mechanical and optical properties bleached kraft pulps were not influenced significantly by the use of black liquor in cooking.http://dx.doi.org/10.5902/198050985089Muitos estudos demonstram que o rendimento da polpação kraft pode ser melhorado pela readsorção de xilanas à polpa durante o cozimento, e o licor negro kraft contém fração significativa das xilanas da madeira, sendo uma importante fonte dessas macromoléculas. Porém, o efeito dessa técnica nas propriedades físico-mecânicas e ópticas de polpa branqueada de eucalipto, ainda não está bem esclarecido. Neste estudo foram produzidas polpas de eucalipto provenientes de cozimento kraft convencional, com diferentes adições de licor negro (0, 25, 50, 75 e 100 % v/v). Os cozimentos foram conduzidos até número kappa 17-18 e as polpas resultantes foram deslignificadas com oxigênio em condições fixas. O branqueamento foi realizado utilizando uma sequência DHT(EP)DP até alvura final 92 % ISO. Em seguida as polpas foram refinadas num moinho PFI a diferentes níveis de revoluções (0, 500, 1.500, 3.000 e 6.000) e realizados testes de resistência ao rasgo, ao arrebentamento e à passagem de ar, alongamento, opacidade, densidade, volume específico aparente, capilaridade Klemm e índice de retenção de água (WRV). A eficiência e o ganho de alvura da pré-deslignificação com oxigênio foram ligeiramente prejudicados pela adição de licor negro ao cozimento kraft. A adição de 50 % de licor negro aos cozimentos resultou em polpas de pior branqueabilidade, sendo a demanda de cloro ativo aumentada em 5,3 kg/t celulose seca para obtenção de alvura 92 % ISO. As propriedades físico-mecânicas e ópticas das polpas kraft branqueadas não foram influenciadas, significativamente, pelo uso de licor negro no cozimento.Universidade Federal de Santa Maria2012-03-30info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://periodicos.ufsm.br/cienciaflorestal/article/view/508910.5902/198050985089Ciência Florestal; Vol. 22 No. 1 (2012); 171-181Ciência Florestal; v. 22 n. 1 (2012); 171-1811980-50980103-9954reponame:Ciência Florestal (Online)instname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMporhttps://periodicos.ufsm.br/cienciaflorestal/article/view/5089/3082Júnior, Dalton LongueColodette, Jorge Luizinfo:eu-repo/semantics/openAccess2014-08-28T23:39:58Zoai:ojs.pkp.sfu.ca:article/5089Revistahttp://www.ufsm.br/cienciaflorestal/ONGhttps://old.scielo.br/oai/scielo-oai.php||cienciaflorestal@ufsm.br|| cienciaflorestal@gmail.com|| cf@smail.ufsm.br1980-50980103-9954opendoar:2014-08-28T23:39:58Ciência Florestal (Online) - Universidade Federal de Santa Maria (UFSM)false
dc.title.none.fl_str_mv EFFECT OF WOOD DISSOLVED SOLIDS ON BLEACHABILITY AND PHYSICAL, MECHANICAL AND OPTICAL PROPERTIES OF Eucalyptus BLEACHED PULP
Efeito dos sólidos dissolvidos da madeira na branqueabilidade e nas propriedades físico-mecânicas e ópticas de polpa kraft branqueada de eucalipto
title EFFECT OF WOOD DISSOLVED SOLIDS ON BLEACHABILITY AND PHYSICAL, MECHANICAL AND OPTICAL PROPERTIES OF Eucalyptus BLEACHED PULP
spellingShingle EFFECT OF WOOD DISSOLVED SOLIDS ON BLEACHABILITY AND PHYSICAL, MECHANICAL AND OPTICAL PROPERTIES OF Eucalyptus BLEACHED PULP
Júnior, Dalton Longue
hemi-cellulose removal
xylans
bleaching
physical-mechanical properties
remoção de hemiceluloses
xilanas
branqueamento
propriedades físico-mecânicas
title_short EFFECT OF WOOD DISSOLVED SOLIDS ON BLEACHABILITY AND PHYSICAL, MECHANICAL AND OPTICAL PROPERTIES OF Eucalyptus BLEACHED PULP
title_full EFFECT OF WOOD DISSOLVED SOLIDS ON BLEACHABILITY AND PHYSICAL, MECHANICAL AND OPTICAL PROPERTIES OF Eucalyptus BLEACHED PULP
title_fullStr EFFECT OF WOOD DISSOLVED SOLIDS ON BLEACHABILITY AND PHYSICAL, MECHANICAL AND OPTICAL PROPERTIES OF Eucalyptus BLEACHED PULP
title_full_unstemmed EFFECT OF WOOD DISSOLVED SOLIDS ON BLEACHABILITY AND PHYSICAL, MECHANICAL AND OPTICAL PROPERTIES OF Eucalyptus BLEACHED PULP
title_sort EFFECT OF WOOD DISSOLVED SOLIDS ON BLEACHABILITY AND PHYSICAL, MECHANICAL AND OPTICAL PROPERTIES OF Eucalyptus BLEACHED PULP
author Júnior, Dalton Longue
author_facet Júnior, Dalton Longue
Colodette, Jorge Luiz
author_role author
author2 Colodette, Jorge Luiz
author2_role author
dc.contributor.author.fl_str_mv Júnior, Dalton Longue
Colodette, Jorge Luiz
dc.subject.por.fl_str_mv hemi-cellulose removal
xylans
bleaching
physical-mechanical properties
remoção de hemiceluloses
xilanas
branqueamento
propriedades físico-mecânicas
topic hemi-cellulose removal
xylans
bleaching
physical-mechanical properties
remoção de hemiceluloses
xilanas
branqueamento
propriedades físico-mecânicas
description http://dx.doi.org/10.5902/198050985089Many studies have shown that the yield of kraft pulping can be improved by xylan reabsorption to the pulp during the cooking, and kraft black liquor contains significant fraction of xylan from wood, an important source of these macromolecules. However, the effect of this technique in the physical-mechanical and optical properties of bleached eucalyptus pulp is not very clear. This study produced pulp from eucalyptus kraft conventional cooking with different additions of black liquor (0, 25, 50, 75 and 100% v/v). The cooking was conducted to kappa number 17-18 and the resulting pulps were de-lignified with oxygen in fixed conditions. Bleaching was performed using a sequence DHT (EP) DP to end whiteness 92% ISO. Next pulps were refined in a PFI mill at different levels of revolutions (0, 500, 1,500, 3,000 and 6,000) and tests of tear resistance, bursting and the air flow, elongation, opacity, density, apparent specific volume, Klemm capillary and water retention value (WRV). The efficiency and brightness gain of the pre-delignification were slightly affected by the addition of black liquor in kraft pulping. The addition of 50% of black liquor to cooking resulted in a worse pulp ability for bleaching, and the chlorine demand increased by 5.3 kg/t pulp oven dry to obtain 92% ISO brightness. The physical-mechanical and optical properties bleached kraft pulps were not influenced significantly by the use of black liquor in cooking.
publishDate 2012
dc.date.none.fl_str_mv 2012-03-30
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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dc.identifier.uri.fl_str_mv https://periodicos.ufsm.br/cienciaflorestal/article/view/5089
10.5902/198050985089
url https://periodicos.ufsm.br/cienciaflorestal/article/view/5089
identifier_str_mv 10.5902/198050985089
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv https://periodicos.ufsm.br/cienciaflorestal/article/view/5089/3082
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.publisher.none.fl_str_mv Universidade Federal de Santa Maria
publisher.none.fl_str_mv Universidade Federal de Santa Maria
dc.source.none.fl_str_mv Ciência Florestal; Vol. 22 No. 1 (2012); 171-181
Ciência Florestal; v. 22 n. 1 (2012); 171-181
1980-5098
0103-9954
reponame:Ciência Florestal (Online)
instname:Universidade Federal de Santa Maria (UFSM)
instacron:UFSM
instname_str Universidade Federal de Santa Maria (UFSM)
instacron_str UFSM
institution UFSM
reponame_str Ciência Florestal (Online)
collection Ciência Florestal (Online)
repository.name.fl_str_mv Ciência Florestal (Online) - Universidade Federal de Santa Maria (UFSM)
repository.mail.fl_str_mv ||cienciaflorestal@ufsm.br|| cienciaflorestal@gmail.com|| cf@smail.ufsm.br
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