Effects of xylan in eucalyptus pulp production
Autor(a) principal: | |
---|---|
Data de Publicação: | 2016 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFLA |
Texto Completo: | http://repositorio.ufla.br/jspui/handle/1/14611 |
Resumo: | The search for a better use of wood in the pulp industry has fuelled interest in a more rational use of its components, particularly xylans. The impact of xylans removal and of xylans redeposition on pulp properties for tissue and P&W paper grades are discussed in this paper. Kraft pulp (15.6% xylans) treatment with 10-70 g.L-1 NaOH resulted in pulps of 14.5-5.9% xylans. The treatments decreased pulp lignin and HexA contents and caused significant positive impact on subsequent oxygen delignification and ECF bleaching. Xylan removal decreased pulp beatability, water retention value and tensile index but increased drainability, water absorption capacity, capillarity Klemm and bulk. Overall, xylan depleted pulps showed almost ideal properties for tissue paper grade pulps. In a second step of the research, xylans extracted from unbleached (BXL) and bleached eucalyptus pulps (WXL) by cold caustic extraction (CCE) were added to a commercial brown pulp in the oxygen delignification (O-stage) and further bleached. Xylans deposition occurred at variable degree (up to 7% on pulp weight) depending upon the O-stage reaction pH. Pulp bleachability was not impaired by WXL xylan deposition but slightly negatively affected by BXL xylans. Pulp beatability was improved by xylan deposition. The deposited xylans were quite stable across bleaching and beating, with the WXL xylans being more stable than the BXL ones. At low energy consumption, the deposited xylans improved pulp physical and mechanical properties. Xylans extraction by CCE with subsequent deposition onto pulp in the O-stage proved attractive for manufacturing high xylan P&W paper grades. |
id |
UFLA_ba4bccece8564c97128222fa1131a4bd |
---|---|
oai_identifier_str |
oai:localhost:1/14611 |
network_acronym_str |
UFLA |
network_name_str |
Repositório Institucional da UFLA |
repository_id_str |
|
spelling |
Effects of xylan in eucalyptus pulp productionEfeitos da xilana na produção de celulose de eucaliptoRedeposition of xylansPulp and paperKraft pulpingRedeposição de xilanasPolpação kraftPapel e celuloseThe search for a better use of wood in the pulp industry has fuelled interest in a more rational use of its components, particularly xylans. The impact of xylans removal and of xylans redeposition on pulp properties for tissue and P&W paper grades are discussed in this paper. Kraft pulp (15.6% xylans) treatment with 10-70 g.L-1 NaOH resulted in pulps of 14.5-5.9% xylans. The treatments decreased pulp lignin and HexA contents and caused significant positive impact on subsequent oxygen delignification and ECF bleaching. Xylan removal decreased pulp beatability, water retention value and tensile index but increased drainability, water absorption capacity, capillarity Klemm and bulk. Overall, xylan depleted pulps showed almost ideal properties for tissue paper grade pulps. In a second step of the research, xylans extracted from unbleached (BXL) and bleached eucalyptus pulps (WXL) by cold caustic extraction (CCE) were added to a commercial brown pulp in the oxygen delignification (O-stage) and further bleached. Xylans deposition occurred at variable degree (up to 7% on pulp weight) depending upon the O-stage reaction pH. Pulp bleachability was not impaired by WXL xylan deposition but slightly negatively affected by BXL xylans. Pulp beatability was improved by xylan deposition. The deposited xylans were quite stable across bleaching and beating, with the WXL xylans being more stable than the BXL ones. At low energy consumption, the deposited xylans improved pulp physical and mechanical properties. Xylans extraction by CCE with subsequent deposition onto pulp in the O-stage proved attractive for manufacturing high xylan P&W paper grades.A busca por uma melhor utilização da madeira na indústria de celulose tem alimentado o interesse em uma utilização mais racional dos seus componentes, em particular as xilanas. O impacto da remoção das xilanas e de sua redeposição nas propriedades da polpa solúvel e tipos de papel de imprimir e escrever (P&W), são discutidos neste trabalho. Celulose kraft (15,6% xilanas) tratamento com 10-70 g.L-1 NaOH resultou em polpas de 14,5-5,9% de xilanas. Os tratamentos diminuiu a lignina e teores de HexA e causou impacto positivo significativo na deslignificação com oxigênio e posterior branqueamento ECF. A remoção de xilanas diminuiu a refinabilidade da polpa, índice de retenção de água e índice de tração, mas aumentou a drenabilidade, a capacidade de absorção de água, a capilaridade Klemm e o bulk. No geral, polpas com baixo teor de xilanas mostrou propriedades quase ideais de polpas para dissolução. Em uma segunda etapa da pesquisa, xilanas extraída de polpa não branqueada (BXL) e polpa de eucalipto branqueada (WXL) por extração cáustica fria (CCE) foram adicionados a uma polpa marrom comercial na deslignificação com oxigênio (O-estágio) e foi branqueada. Deposição de xilanas ocorreu em grau variável (até 7% em peso de celulose), dependendo do pH da reação do O-estágio. O branqueamento da polpa não foi prejudicada por WXL deposição de xilanas, mas ligeiramente afetada negativamente por xilanas BXL. A refinabilidade da polpa celulósica foi melhorada pela deposição de xilanas. As xilanas depositadas foram bastante estáveis ao longo do branqueamento, apesar de, com as xilanas WXL ser mais estável do que com as BXL. Em baixo consumo de energia, as xilanas depositados melhorou as propriedades física e mecânicas. A extração de xilanas pelo CCE com posterior deposição em polpa no O-estágio mostrou atraente para a fabricação de polpa com alto conteúdo de xilanas tipos de papel P&W.Universidade Federal de Lavras (UFLA)2016-07-082017-08-01T20:15:24Z2017-08-01T20:15:24Z2017-08-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdfBARBOSA, B. M. et al. Effects of xylan in eucalyptus pulp production. CERNE, Lavras, v. 22, n. 2, p. 207-214, 2016.http://repositorio.ufla.br/jspui/handle/1/14611CERNE; Vol 22 No 2 (2016); 207-214CERNE; Vol 22 No 2 (2016); 207-2142317-63420104-7760reponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLAenghttp://www.cerne.ufla.br/site/index.php/CERNE/article/view/1227/923Copyright (c) 2016 CERNEhttp://creativecommons.org/licenses/by/4.0/Attribution 4.0 Internationalinfo:eu-repo/semantics/openAccessBarbosa, Bianca MoreiraColodette, Jorge LuizMuguet, Marcelo Coelho dos SantosGomes, Valéria JusteOliveira, Rubens Chaves de2021-04-13T22:45:36Zoai:localhost:1/14611Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2021-04-13T22:45:36Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false |
dc.title.none.fl_str_mv |
Effects of xylan in eucalyptus pulp production Efeitos da xilana na produção de celulose de eucalipto |
title |
Effects of xylan in eucalyptus pulp production |
spellingShingle |
Effects of xylan in eucalyptus pulp production Barbosa, Bianca Moreira Redeposition of xylans Pulp and paper Kraft pulping Redeposição de xilanas Polpação kraft Papel e celulose |
title_short |
Effects of xylan in eucalyptus pulp production |
title_full |
Effects of xylan in eucalyptus pulp production |
title_fullStr |
Effects of xylan in eucalyptus pulp production |
title_full_unstemmed |
Effects of xylan in eucalyptus pulp production |
title_sort |
Effects of xylan in eucalyptus pulp production |
author |
Barbosa, Bianca Moreira |
author_facet |
Barbosa, Bianca Moreira Colodette, Jorge Luiz Muguet, Marcelo Coelho dos Santos Gomes, Valéria Juste Oliveira, Rubens Chaves de |
author_role |
author |
author2 |
Colodette, Jorge Luiz Muguet, Marcelo Coelho dos Santos Gomes, Valéria Juste Oliveira, Rubens Chaves de |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Barbosa, Bianca Moreira Colodette, Jorge Luiz Muguet, Marcelo Coelho dos Santos Gomes, Valéria Juste Oliveira, Rubens Chaves de |
dc.subject.por.fl_str_mv |
Redeposition of xylans Pulp and paper Kraft pulping Redeposição de xilanas Polpação kraft Papel e celulose |
topic |
Redeposition of xylans Pulp and paper Kraft pulping Redeposição de xilanas Polpação kraft Papel e celulose |
description |
The search for a better use of wood in the pulp industry has fuelled interest in a more rational use of its components, particularly xylans. The impact of xylans removal and of xylans redeposition on pulp properties for tissue and P&W paper grades are discussed in this paper. Kraft pulp (15.6% xylans) treatment with 10-70 g.L-1 NaOH resulted in pulps of 14.5-5.9% xylans. The treatments decreased pulp lignin and HexA contents and caused significant positive impact on subsequent oxygen delignification and ECF bleaching. Xylan removal decreased pulp beatability, water retention value and tensile index but increased drainability, water absorption capacity, capillarity Klemm and bulk. Overall, xylan depleted pulps showed almost ideal properties for tissue paper grade pulps. In a second step of the research, xylans extracted from unbleached (BXL) and bleached eucalyptus pulps (WXL) by cold caustic extraction (CCE) were added to a commercial brown pulp in the oxygen delignification (O-stage) and further bleached. Xylans deposition occurred at variable degree (up to 7% on pulp weight) depending upon the O-stage reaction pH. Pulp bleachability was not impaired by WXL xylan deposition but slightly negatively affected by BXL xylans. Pulp beatability was improved by xylan deposition. The deposited xylans were quite stable across bleaching and beating, with the WXL xylans being more stable than the BXL ones. At low energy consumption, the deposited xylans improved pulp physical and mechanical properties. Xylans extraction by CCE with subsequent deposition onto pulp in the O-stage proved attractive for manufacturing high xylan P&W paper grades. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-07-08 2017-08-01T20:15:24Z 2017-08-01T20:15:24Z 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 |
BARBOSA, B. M. et al. Effects of xylan in eucalyptus pulp production. CERNE, Lavras, v. 22, n. 2, p. 207-214, 2016. http://repositorio.ufla.br/jspui/handle/1/14611 |
identifier_str_mv |
BARBOSA, B. M. et al. Effects of xylan in eucalyptus pulp production. CERNE, Lavras, v. 22, n. 2, p. 207-214, 2016. |
url |
http://repositorio.ufla.br/jspui/handle/1/14611 |
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/1227/923 |
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 |
CERNE; Vol 22 No 2 (2016); 207-214 CERNE; Vol 22 No 2 (2016); 207-214 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 |
_version_ |
1807835162371686400 |