EFFECT OF WOOD DISSOLVED SOLIDS ON BLEACHABILITY AND PHYSICAL, MECHANICAL AND OPTICAL PROPERTIES OF Eucalyptus BLEACHED PULP
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | |
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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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 info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
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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1799944128047349760 |