KRAFT AND KRAFT/AQ PULPING FROM PREHIDROLYZED WOOD OF Eucalyptus urograndis
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Ciência Florestal (Online) |
Texto Completo: | https://periodicos.ufsm.br/cienciaflorestal/article/view/25148 |
Resumo: | The wood of the gender Eucalyptus occupies a prominence place among other cellulose sources due to its chemical composition, its low cost, abundance and availability. Among the chemical pulping processes, kraft process is the most extensively one used for the production of cellulosic pulps starting from eucalyptus wood. The anthraquinone (AQ) usage in the pulping has as main purposes to increase the delignification rate as well as to protect the pulp from the carbohydrate degradation. The present work has aimed to use the anthraquinone as an addictive in the cooking seeking to reduce the load of applied sulphidity without harming the quality of the pulp. The kraft and kraft/AQ cooking were accomplished in rotative laboratorial digester being varied the active alkali initially (10, 13, 16 and 19%) and, later, the sulphidity (5, 10, 15, 20 and 25%), maintaining the other conditions constant aiming to obtain pulp with kappa number close to nine. Starting from the variation of the active alkali and of the sulphidity, delignification curves were established between active alkali and kappa number and, sulphidity and kappa number, where it was possible to establish the minimum necessary amounts of alkali, as well as of the sulphidity. Starting from the cooking, it was possible to establish the active alkali and sulphidity loads of 17,4% and 8,8%, respectively. The cooking to the certain conditions presented screened yield of 48,63%, and the yield based on the initial mass of wood was of 42,24%, obtaining a high quality pulp, in other words, with low number kappa and hemicelluloses tenor (0,41%) and high tenor of alpha cellulose (98,49%). |
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KRAFT AND KRAFT/AQ PULPING FROM PREHIDROLYZED WOOD OF Eucalyptus urograndisPOLPAÇÃO KRAFT E KRAFT/AQ DA MADEIRA PRÉ-HIDROLISADA DE Eucalyptus urograndisanthraquinonepulpingdissolving pulpeucalyptusantraquinonapolpaçãopolpa solúveleucalipto.The wood of the gender Eucalyptus occupies a prominence place among other cellulose sources due to its chemical composition, its low cost, abundance and availability. Among the chemical pulping processes, kraft process is the most extensively one used for the production of cellulosic pulps starting from eucalyptus wood. The anthraquinone (AQ) usage in the pulping has as main purposes to increase the delignification rate as well as to protect the pulp from the carbohydrate degradation. The present work has aimed to use the anthraquinone as an addictive in the cooking seeking to reduce the load of applied sulphidity without harming the quality of the pulp. The kraft and kraft/AQ cooking were accomplished in rotative laboratorial digester being varied the active alkali initially (10, 13, 16 and 19%) and, later, the sulphidity (5, 10, 15, 20 and 25%), maintaining the other conditions constant aiming to obtain pulp with kappa number close to nine. Starting from the variation of the active alkali and of the sulphidity, delignification curves were established between active alkali and kappa number and, sulphidity and kappa number, where it was possible to establish the minimum necessary amounts of alkali, as well as of the sulphidity. Starting from the cooking, it was possible to establish the active alkali and sulphidity loads of 17,4% and 8,8%, respectively. The cooking to the certain conditions presented screened yield of 48,63%, and the yield based on the initial mass of wood was of 42,24%, obtaining a high quality pulp, in other words, with low number kappa and hemicelluloses tenor (0,41%) and high tenor of alpha cellulose (98,49%).A madeira do gênero Eucalyptus ocupa um lugar de destaque em relação a outras fontes de celulose, devido a sua composição química, seu baixo custo, abundância e disponibilidade. Dentre os processos de polpação química, o processo kraft é o mais extensivamente utilizado para produção de polpas celulósicas a partir da madeira de eucalipto. O uso de antraquinona (AQ) na polpação tem como principais finalidades aumentar a taxa de deslignificação, bem como proteger a polpa quanto à degradação dos polissacarídeos. O presente trabalho objetivou utilizar a antraquinona como aditivo no cozimento visando reduzir a carga de sulfidez aplicada no processo sem prejudicar a qualidade da polpa. Os cozimentos kraft e kraft/AQ foram realizados em digestor rotativo laboratorial variando-se inicialmente o álcali ativo (10, 13, 16 e 19%) e, posteriormente, a sulfidez (5, 10, 15, 20 e 25%), mantendo-se as demais condições constantes visando obter polpa com número kappa próximo de 9. A partir da variação do álcali ativo e da sulfidez foram estabelecidas curvas de deslignificação entre álcali ativo e número kappa e, sulfidez e número kappa, de onde foi possível estabelecer as quantidades mínimas necessárias de álcali, bem como de sulfidez. A partir dos cozimentos foi possível estabelecer as cargas de álcali ativo e sulfidez de 17,4% e 8,8%, respectivamente. O cozimento em condições determinadas apresentou rendimento depurado de 48,63%, sendo que o rendimento com base na massa inicial de madeira foi de 42,24%, gerando uma polpa de elevada qualidade, ou seja, com baixo número kappa e teor de hemiceluloses (0,41%) e elevado teor de alfa celulose (98,49%).Universidade Federal de Santa Maria2016-12-28info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://periodicos.ufsm.br/cienciaflorestal/article/view/2514810.5902/1980509825148Ciência Florestal; Vol. 26 No. 4 (2016); 1281-1290Ciência Florestal; v. 26 n. 4 (2016); 1281-12901980-50980103-9954reponame:Ciência Florestal (Online)instname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMporhttps://periodicos.ufsm.br/cienciaflorestal/article/view/25148/pdfCopyright (c) 2016 Ciência Florestalinfo:eu-repo/semantics/openAccessdos Santos, Rafaelde Mello Júnior, Julio AntonioCaraschi, José CláudioVentorim, GustavoPereira, Felipo Augusto2017-04-05T18:35:33Zoai:ojs.pkp.sfu.ca:article/25148Revistahttp://www.ufsm.br/cienciaflorestal/ONGhttps://old.scielo.br/oai/scielo-oai.php||cienciaflorestal@ufsm.br|| cienciaflorestal@gmail.com|| cf@smail.ufsm.br1980-50980103-9954opendoar:2017-04-05T18:35:33Ciência Florestal (Online) - Universidade Federal de Santa Maria (UFSM)false |
dc.title.none.fl_str_mv |
KRAFT AND KRAFT/AQ PULPING FROM PREHIDROLYZED WOOD OF Eucalyptus urograndis POLPAÇÃO KRAFT E KRAFT/AQ DA MADEIRA PRÉ-HIDROLISADA DE Eucalyptus urograndis |
title |
KRAFT AND KRAFT/AQ PULPING FROM PREHIDROLYZED WOOD OF Eucalyptus urograndis |
spellingShingle |
KRAFT AND KRAFT/AQ PULPING FROM PREHIDROLYZED WOOD OF Eucalyptus urograndis dos Santos, Rafael anthraquinone pulping dissolving pulp eucalyptus antraquinona polpação polpa solúvel eucalipto. |
title_short |
KRAFT AND KRAFT/AQ PULPING FROM PREHIDROLYZED WOOD OF Eucalyptus urograndis |
title_full |
KRAFT AND KRAFT/AQ PULPING FROM PREHIDROLYZED WOOD OF Eucalyptus urograndis |
title_fullStr |
KRAFT AND KRAFT/AQ PULPING FROM PREHIDROLYZED WOOD OF Eucalyptus urograndis |
title_full_unstemmed |
KRAFT AND KRAFT/AQ PULPING FROM PREHIDROLYZED WOOD OF Eucalyptus urograndis |
title_sort |
KRAFT AND KRAFT/AQ PULPING FROM PREHIDROLYZED WOOD OF Eucalyptus urograndis |
author |
dos Santos, Rafael |
author_facet |
dos Santos, Rafael de Mello Júnior, Julio Antonio Caraschi, José Cláudio Ventorim, Gustavo Pereira, Felipo Augusto |
author_role |
author |
author2 |
de Mello Júnior, Julio Antonio Caraschi, José Cláudio Ventorim, Gustavo Pereira, Felipo Augusto |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
dos Santos, Rafael de Mello Júnior, Julio Antonio Caraschi, José Cláudio Ventorim, Gustavo Pereira, Felipo Augusto |
dc.subject.por.fl_str_mv |
anthraquinone pulping dissolving pulp eucalyptus antraquinona polpação polpa solúvel eucalipto. |
topic |
anthraquinone pulping dissolving pulp eucalyptus antraquinona polpação polpa solúvel eucalipto. |
description |
The wood of the gender Eucalyptus occupies a prominence place among other cellulose sources due to its chemical composition, its low cost, abundance and availability. Among the chemical pulping processes, kraft process is the most extensively one used for the production of cellulosic pulps starting from eucalyptus wood. The anthraquinone (AQ) usage in the pulping has as main purposes to increase the delignification rate as well as to protect the pulp from the carbohydrate degradation. The present work has aimed to use the anthraquinone as an addictive in the cooking seeking to reduce the load of applied sulphidity without harming the quality of the pulp. The kraft and kraft/AQ cooking were accomplished in rotative laboratorial digester being varied the active alkali initially (10, 13, 16 and 19%) and, later, the sulphidity (5, 10, 15, 20 and 25%), maintaining the other conditions constant aiming to obtain pulp with kappa number close to nine. Starting from the variation of the active alkali and of the sulphidity, delignification curves were established between active alkali and kappa number and, sulphidity and kappa number, where it was possible to establish the minimum necessary amounts of alkali, as well as of the sulphidity. Starting from the cooking, it was possible to establish the active alkali and sulphidity loads of 17,4% and 8,8%, respectively. The cooking to the certain conditions presented screened yield of 48,63%, and the yield based on the initial mass of wood was of 42,24%, obtaining a high quality pulp, in other words, with low number kappa and hemicelluloses tenor (0,41%) and high tenor of alpha cellulose (98,49%). |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-12-28 |
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/25148 10.5902/1980509825148 |
url |
https://periodicos.ufsm.br/cienciaflorestal/article/view/25148 |
identifier_str_mv |
10.5902/1980509825148 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
https://periodicos.ufsm.br/cienciaflorestal/article/view/25148/pdf |
dc.rights.driver.fl_str_mv |
Copyright (c) 2016 Ciência Florestal info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2016 Ciência Florestal |
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. 26 No. 4 (2016); 1281-1290 Ciência Florestal; v. 26 n. 4 (2016); 1281-1290 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_ |
1799944131310518272 |