WOOD CELLULOSE REMOVAL BY MEANS OF SELF- HYDROLYSIS TREATMENT
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Ciência Florestal (Online) |
Texto Completo: | https://periodicos.ufsm.br/cienciaflorestal/article/view/3811 |
Resumo: | The objective of this study was to assess the impact of removing hemicelluloses from chips of eucalyptus wood by self-hydrolysis treatment (H2O) and on the subsequent ‘kraft’ process behavior and pulps bleachability and quality. The self-hydrolysis treatments were conducted at temperatures of 152°C (30, 45 and 60 minutes); 160°C (15, 30 and 45 minutes); and 170°C (5, 10, 15, 20 and 30 minutes); water: wood ratio of 4:1 m3/t. Normal chips (reference) and self-hydrolyzed chips at 170°C during 5, 15 and 30 minutes were submitted to ‘kraft’ cooking up to kappa number 16 – 18 and the resulting pulp was bleached using the O/OD (EPO) DD sequence. According to the results obtained, self-hydrolyzing the chips at 170°C for 30 minutes allowed the removal of up to 60% hemicelluloses. Cooking yield of the self-hydrolyzed chips for 30 minutes was around 6% smaller and pentosan content 88% lower than that of the regular chips. The efficiency of delignification with oxygen of the pulp derived from self-hydrolyzed chips for 30 minutes was of 75%, compared to 43.6% of the reference-pulp, and the bleaching cost using the O/OD (EPO) DD sequence was US$ 7/adt per pulp, lower that that of the reference-pulp. The effluent originated from bleaching the pulp derived from the self-hydrolyzed chips presented lower values of COD (39.6%), color (21.3%) and AOX (51.6%), compared to that of the reference-pulp. |
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WOOD CELLULOSE REMOVAL BY MEANS OF SELF- HYDROLYSIS TREATMENTRemoção de hemiceluloses da madeira por tratamento de auto-hidróliseself-hydrolysishemicellulose removalxylanscooking yield.auto-hidróliseremoção de hemicelulosesxilanasrendimentoThe objective of this study was to assess the impact of removing hemicelluloses from chips of eucalyptus wood by self-hydrolysis treatment (H2O) and on the subsequent ‘kraft’ process behavior and pulps bleachability and quality. The self-hydrolysis treatments were conducted at temperatures of 152°C (30, 45 and 60 minutes); 160°C (15, 30 and 45 minutes); and 170°C (5, 10, 15, 20 and 30 minutes); water: wood ratio of 4:1 m3/t. Normal chips (reference) and self-hydrolyzed chips at 170°C during 5, 15 and 30 minutes were submitted to ‘kraft’ cooking up to kappa number 16 – 18 and the resulting pulp was bleached using the O/OD (EPO) DD sequence. According to the results obtained, self-hydrolyzing the chips at 170°C for 30 minutes allowed the removal of up to 60% hemicelluloses. Cooking yield of the self-hydrolyzed chips for 30 minutes was around 6% smaller and pentosan content 88% lower than that of the regular chips. The efficiency of delignification with oxygen of the pulp derived from self-hydrolyzed chips for 30 minutes was of 75%, compared to 43.6% of the reference-pulp, and the bleaching cost using the O/OD (EPO) DD sequence was US$ 7/adt per pulp, lower that that of the reference-pulp. The effluent originated from bleaching the pulp derived from the self-hydrolyzed chips presented lower values of COD (39.6%), color (21.3%) and AOX (51.6%), compared to that of the reference-pulp.O objetivo deste estudo foi avaliar o impacto da remoção de hemiceluloses de cavacos de madeira de um híbrido de duas espécies de eucalipto (Eucalyptus grandis x Eucalyptus urophylla), por tratamento de auto-hidrólise (H2O) dos mesmos, no comportamento do processo kraft subsequente e na branqueabilidade e qualidade das polpas. Os tratamentos de auto-hidrólise dos cavacos foram realizados em temperaturas de 152°C (30, 45 e 60 minutos); 160°C (15, 30 e 45 minutos); e 170°C (5, 10, 15, 20 e 30 minutos); relação água/madeira de 4:1 m3/t. Cavacos normais (referência) e auto-hidrolisados a 170°C por 5, 15 e 30 min foram cozidos pelo processo kraft até número kappa 16 - 18 e a polpa resultante foi branqueada pela sequência O/OD(EPO)DD. Os resultados indicaram que a auto-hidrólise dos cavacos por 30 minutos a 170°C, permitiu a remoção de até 60% de hemiceluloses. O rendimento dos cozimentos de cavacos auto-hidrolisados por 30 minutos foi cerca de 6% menor e o teor de pentosanas 88% menor que o dos cavacos normais. A eficiência da deslignificação com oxigênio da polpa derivada de cavacos auto-hidrolisados por 30 minutos foi de 75%, contra 43,6% da polpa-referência, e o custo de branqueamento pela sequência O/ OD(EPO)DD foi US$ 7/tas de polpa mais baixo que o da polpa-referência. O efluente do branqueamento da polpa oriunda de cavacos auto-hidrolisados apresentou menores valores de DQO (39,6%), cor (21,3%) e AOX (51,6%), em relação ao da polpa-referência.Universidade Federal de Santa Maria2011-09-30info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://periodicos.ufsm.br/cienciaflorestal/article/view/381110.5902/198050983811Ciência Florestal; Vol. 21 No. 3 (2011); 541-550Ciência Florestal; v. 21 n. 3 (2011); 541-5501980-50980103-9954reponame:Ciência Florestal (Online)instname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMporhttps://periodicos.ufsm.br/cienciaflorestal/article/view/3811/2221Longue Júnior, DaltonColodette, Jorge Luizinfo:eu-repo/semantics/openAccess2017-05-03T17:50:49Zoai:ojs.pkp.sfu.ca:article/3811Revistahttp://www.ufsm.br/cienciaflorestal/ONGhttps://old.scielo.br/oai/scielo-oai.php||cienciaflorestal@ufsm.br|| cienciaflorestal@gmail.com|| cf@smail.ufsm.br1980-50980103-9954opendoar:2017-05-03T17:50:49Ciência Florestal (Online) - Universidade Federal de Santa Maria (UFSM)false |
dc.title.none.fl_str_mv |
WOOD CELLULOSE REMOVAL BY MEANS OF SELF- HYDROLYSIS TREATMENT Remoção de hemiceluloses da madeira por tratamento de auto-hidrólise |
title |
WOOD CELLULOSE REMOVAL BY MEANS OF SELF- HYDROLYSIS TREATMENT |
spellingShingle |
WOOD CELLULOSE REMOVAL BY MEANS OF SELF- HYDROLYSIS TREATMENT Longue Júnior, Dalton self-hydrolysis hemicellulose removal xylans cooking yield. auto-hidrólise remoção de hemiceluloses xilanas rendimento |
title_short |
WOOD CELLULOSE REMOVAL BY MEANS OF SELF- HYDROLYSIS TREATMENT |
title_full |
WOOD CELLULOSE REMOVAL BY MEANS OF SELF- HYDROLYSIS TREATMENT |
title_fullStr |
WOOD CELLULOSE REMOVAL BY MEANS OF SELF- HYDROLYSIS TREATMENT |
title_full_unstemmed |
WOOD CELLULOSE REMOVAL BY MEANS OF SELF- HYDROLYSIS TREATMENT |
title_sort |
WOOD CELLULOSE REMOVAL BY MEANS OF SELF- HYDROLYSIS TREATMENT |
author |
Longue Júnior, Dalton |
author_facet |
Longue Júnior, Dalton Colodette, Jorge Luiz |
author_role |
author |
author2 |
Colodette, Jorge Luiz |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Longue Júnior, Dalton Colodette, Jorge Luiz |
dc.subject.por.fl_str_mv |
self-hydrolysis hemicellulose removal xylans cooking yield. auto-hidrólise remoção de hemiceluloses xilanas rendimento |
topic |
self-hydrolysis hemicellulose removal xylans cooking yield. auto-hidrólise remoção de hemiceluloses xilanas rendimento |
description |
The objective of this study was to assess the impact of removing hemicelluloses from chips of eucalyptus wood by self-hydrolysis treatment (H2O) and on the subsequent ‘kraft’ process behavior and pulps bleachability and quality. The self-hydrolysis treatments were conducted at temperatures of 152°C (30, 45 and 60 minutes); 160°C (15, 30 and 45 minutes); and 170°C (5, 10, 15, 20 and 30 minutes); water: wood ratio of 4:1 m3/t. Normal chips (reference) and self-hydrolyzed chips at 170°C during 5, 15 and 30 minutes were submitted to ‘kraft’ cooking up to kappa number 16 – 18 and the resulting pulp was bleached using the O/OD (EPO) DD sequence. According to the results obtained, self-hydrolyzing the chips at 170°C for 30 minutes allowed the removal of up to 60% hemicelluloses. Cooking yield of the self-hydrolyzed chips for 30 minutes was around 6% smaller and pentosan content 88% lower than that of the regular chips. The efficiency of delignification with oxygen of the pulp derived from self-hydrolyzed chips for 30 minutes was of 75%, compared to 43.6% of the reference-pulp, and the bleaching cost using the O/OD (EPO) DD sequence was US$ 7/adt per pulp, lower that that of the reference-pulp. The effluent originated from bleaching the pulp derived from the self-hydrolyzed chips presented lower values of COD (39.6%), color (21.3%) and AOX (51.6%), compared to that of the reference-pulp. |
publishDate |
2011 |
dc.date.none.fl_str_mv |
2011-09-30 |
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/3811 10.5902/198050983811 |
url |
https://periodicos.ufsm.br/cienciaflorestal/article/view/3811 |
identifier_str_mv |
10.5902/198050983811 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
https://periodicos.ufsm.br/cienciaflorestal/article/view/3811/2221 |
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. 21 No. 3 (2011); 541-550 Ciência Florestal; v. 21 n. 3 (2011); 541-550 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 |
_version_ |
1799944127644696576 |