Otimização do cozimento kraft para produção de celulose a partir de madeiras de Eucalyptus globulus com diferentes teores de lignina
Autor(a) principal: | |
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Data de Publicação: | 2002 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Manancial - Repositório Digital da UFSM |
Texto Completo: | http://repositorio.ufsm.br/handle/1/26745 |
Resumo: | In this research, it was optimized the kraft pulping for pulp production using Eucalyptus globulus woods with two different lignin contents. Seventy-two laboratory cooking were made with wood chips obtained from six Eucalyptus globulus trees selected from a group of 50 trees. The wood chips from three trees with the lowest lignin content, with average 20,53%, were mixed proportionally based on the tree weights, obtaining the sample of low lignin content wood. The same was made to obtain the sample for wood chips with the highest lignin content, with average 23,02%. The two lignin levels were statistically different. The two wood samples had basic densities statistically not different. Using three temperatures levels (160, 165 and 170ºC), and three active alkali (17, 18,5 and 20%), the wood chips were converted to kraft pulp. The pulp was then characterized to analyze the influence of the distinct treatments employed in the cooking on its properties. The effect of the cooking conditions was expressed by mathematical models in order to determine the optimum points for each of the evaluated properties. The optimization process indicated maximum temperature of 168ºC, and active alkali of 19%, for maximum kraft pulping yield to achieve kappa number 18; this result was for woods with low lignin content. For woods containing the high lignin content, the optimization showed cooking temperature of 169ºC and active alkali of 19% for kappa number of 18. The average reduction of 2,49% in wood lignin content promoted a gain correspondent to 2,2% in the kraft yield (o.d. basis) and a reduction on the active alkali charge of 1,2% (o.d. basis) to achieve kappa numbers from 16 to 19, preserving pulp properties in good levels of quality. If the option is to work with kappa number 19 instead of 16, the gain in kraft yield is approximately 2%. Therefore, when working with low lignin content wood and kappa number 19 instead of 16, a substantial gain of approximately 4,2% is obtained for kraft pulp yield, and additionally 2 to 2,5% reduction in the active alkali charge based on o.d. wood. |
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Otimização do cozimento kraft para produção de celulose a partir de madeiras de Eucalyptus globulus com diferentes teores de ligninaKraft pulping optimization for pulp production from Eucalyptus globulus woods with different lignin contentsEngenharia FlorestalSilviculturaEucaliptoMadeiraCeluloseCozimento kraftLigninaCNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTALIn this research, it was optimized the kraft pulping for pulp production using Eucalyptus globulus woods with two different lignin contents. Seventy-two laboratory cooking were made with wood chips obtained from six Eucalyptus globulus trees selected from a group of 50 trees. The wood chips from three trees with the lowest lignin content, with average 20,53%, were mixed proportionally based on the tree weights, obtaining the sample of low lignin content wood. The same was made to obtain the sample for wood chips with the highest lignin content, with average 23,02%. The two lignin levels were statistically different. The two wood samples had basic densities statistically not different. Using three temperatures levels (160, 165 and 170ºC), and three active alkali (17, 18,5 and 20%), the wood chips were converted to kraft pulp. The pulp was then characterized to analyze the influence of the distinct treatments employed in the cooking on its properties. The effect of the cooking conditions was expressed by mathematical models in order to determine the optimum points for each of the evaluated properties. The optimization process indicated maximum temperature of 168ºC, and active alkali of 19%, for maximum kraft pulping yield to achieve kappa number 18; this result was for woods with low lignin content. For woods containing the high lignin content, the optimization showed cooking temperature of 169ºC and active alkali of 19% for kappa number of 18. The average reduction of 2,49% in wood lignin content promoted a gain correspondent to 2,2% in the kraft yield (o.d. basis) and a reduction on the active alkali charge of 1,2% (o.d. basis) to achieve kappa numbers from 16 to 19, preserving pulp properties in good levels of quality. If the option is to work with kappa number 19 instead of 16, the gain in kraft yield is approximately 2%. Therefore, when working with low lignin content wood and kappa number 19 instead of 16, a substantial gain of approximately 4,2% is obtained for kraft pulp yield, and additionally 2 to 2,5% reduction in the active alkali charge based on o.d. wood.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESNeste estudo, foi realizada a otimização do cozimento kraft de madeiras de Eucalyptus globulus com dois níveis diferentes de teor de lignina. Foram realizados 72 cozimentos com cavacos de seis árvores de Eucalyptus globulus Labill. subespécie globulus com oito anos de idade. As árvores foram selecionadas com base em uma amostragem de 50 indivíduos da espécie. Os cavacos das três árvores de menor teor de lignina, com média de 20,53%, foram misturados entre si proporcionalmente ao peso das árvores, formando o nível com teor de lignina baixo; os cavacos das três árvores de maior teor de lignina, com média de 23,02%, também misturados proporcionalmente entre si, formaram o nível de teor de lignina alto. Os dois níveis diferiram estatisticamente entre si, diferentemente das densidades básicas das madeiras não diferiram. Avaliaram-se três condições de temperatura máxima de cozimento (160, 165 e 170ºC) e três condições de álcali ativo (17, 18,5 e 20%) para os dois níveis de lignina. Através de análise de regressão estabeleceram-se relações entre as características das celuloses e as condições de cozimento que melhor representassem os pontos ótimos. A otimização realizada através dos modelos de regressão selecionados indicou temperatura máxima de 168ºC e álcali ativo de 17,9%, para se obter o máximo rendimento depurado com número kappa 18 para as madeiras de baixo teor de lignina. Para as madeiras de alto teor de lignina, as condições otimizadas foram temperatura máxima de cozimento de 169ºC e álcali ativo de 19%, para obter número kappa 18. Uma redução média de 2,49% no teor de lignina na madeira, promoveu um ganho médio de 2,2% no rendimento depurado, base madeira, e uma redução média de 1,2% de álcali ativo aplicado, base madeira, obtendo-se valores de número kappa de 16 a 19 e mantendo-se as demais propriedades da celulose com bons níveis de qualidade. Se, adicionalmente, optar-se por trabalhar com números kappa 19 em vez de 16, o ganho em rendimento depurado é de cerca de 2%. Isso significa que com madeira de baixo teor de lignina e número kappa 19 consegue-se cerca de 4,2% a mais de rendimento depurado e 2 a 2,5% a menos de carga aplicada de álcali ativo, em relação a madeira com alto teor de lignina deslignificada a número kappa 16.Universidade Federal de Santa MariaBrasilRecursos Florestais e Engenharia FlorestalUFSMPrograma de Pós-Graduação em Engenharia FlorestalCentro de Ciências RuraisFoelkel, Celso Edmundo Bochettihttp://lattes.cnpq.br/2749984197001803Silva Júnior, Francides Gomes daHaselein, Clovis RobertoCardoso, Gabriel Valim2022-11-03T13:10:51Z2022-11-03T13:10:51Z2002-07-04info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://repositorio.ufsm.br/handle/1/26745porAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessreponame:Manancial - Repositório Digital da UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSM2022-11-03T13:10:51Zoai:repositorio.ufsm.br:1/26745Biblioteca Digital de Teses e Dissertaçõeshttps://repositorio.ufsm.br/ONGhttps://repositorio.ufsm.br/oai/requestatendimento.sib@ufsm.br||tedebc@gmail.comopendoar:2022-11-03T13:10:51Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.none.fl_str_mv |
Otimização do cozimento kraft para produção de celulose a partir de madeiras de Eucalyptus globulus com diferentes teores de lignina Kraft pulping optimization for pulp production from Eucalyptus globulus woods with different lignin contents |
title |
Otimização do cozimento kraft para produção de celulose a partir de madeiras de Eucalyptus globulus com diferentes teores de lignina |
spellingShingle |
Otimização do cozimento kraft para produção de celulose a partir de madeiras de Eucalyptus globulus com diferentes teores de lignina Cardoso, Gabriel Valim Engenharia Florestal Silvicultura Eucalipto Madeira Celulose Cozimento kraft Lignina CNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL |
title_short |
Otimização do cozimento kraft para produção de celulose a partir de madeiras de Eucalyptus globulus com diferentes teores de lignina |
title_full |
Otimização do cozimento kraft para produção de celulose a partir de madeiras de Eucalyptus globulus com diferentes teores de lignina |
title_fullStr |
Otimização do cozimento kraft para produção de celulose a partir de madeiras de Eucalyptus globulus com diferentes teores de lignina |
title_full_unstemmed |
Otimização do cozimento kraft para produção de celulose a partir de madeiras de Eucalyptus globulus com diferentes teores de lignina |
title_sort |
Otimização do cozimento kraft para produção de celulose a partir de madeiras de Eucalyptus globulus com diferentes teores de lignina |
author |
Cardoso, Gabriel Valim |
author_facet |
Cardoso, Gabriel Valim |
author_role |
author |
dc.contributor.none.fl_str_mv |
Foelkel, Celso Edmundo Bochetti http://lattes.cnpq.br/2749984197001803 Silva Júnior, Francides Gomes da Haselein, Clovis Roberto |
dc.contributor.author.fl_str_mv |
Cardoso, Gabriel Valim |
dc.subject.por.fl_str_mv |
Engenharia Florestal Silvicultura Eucalipto Madeira Celulose Cozimento kraft Lignina CNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL |
topic |
Engenharia Florestal Silvicultura Eucalipto Madeira Celulose Cozimento kraft Lignina CNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL |
description |
In this research, it was optimized the kraft pulping for pulp production using Eucalyptus globulus woods with two different lignin contents. Seventy-two laboratory cooking were made with wood chips obtained from six Eucalyptus globulus trees selected from a group of 50 trees. The wood chips from three trees with the lowest lignin content, with average 20,53%, were mixed proportionally based on the tree weights, obtaining the sample of low lignin content wood. The same was made to obtain the sample for wood chips with the highest lignin content, with average 23,02%. The two lignin levels were statistically different. The two wood samples had basic densities statistically not different. Using three temperatures levels (160, 165 and 170ºC), and three active alkali (17, 18,5 and 20%), the wood chips were converted to kraft pulp. The pulp was then characterized to analyze the influence of the distinct treatments employed in the cooking on its properties. The effect of the cooking conditions was expressed by mathematical models in order to determine the optimum points for each of the evaluated properties. The optimization process indicated maximum temperature of 168ºC, and active alkali of 19%, for maximum kraft pulping yield to achieve kappa number 18; this result was for woods with low lignin content. For woods containing the high lignin content, the optimization showed cooking temperature of 169ºC and active alkali of 19% for kappa number of 18. The average reduction of 2,49% in wood lignin content promoted a gain correspondent to 2,2% in the kraft yield (o.d. basis) and a reduction on the active alkali charge of 1,2% (o.d. basis) to achieve kappa numbers from 16 to 19, preserving pulp properties in good levels of quality. If the option is to work with kappa number 19 instead of 16, the gain in kraft yield is approximately 2%. Therefore, when working with low lignin content wood and kappa number 19 instead of 16, a substantial gain of approximately 4,2% is obtained for kraft pulp yield, and additionally 2 to 2,5% reduction in the active alkali charge based on o.d. wood. |
publishDate |
2002 |
dc.date.none.fl_str_mv |
2002-07-04 2022-11-03T13:10:51Z 2022-11-03T13:10:51Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/26745 |
url |
http://repositorio.ufsm.br/handle/1/26745 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Brasil Recursos Florestais e Engenharia Florestal UFSM Programa de Pós-Graduação em Engenharia Florestal Centro de Ciências Rurais |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Brasil Recursos Florestais e Engenharia Florestal UFSM Programa de Pós-Graduação em Engenharia Florestal Centro de Ciências Rurais |
dc.source.none.fl_str_mv |
reponame:Manancial - Repositório Digital da UFSM instname:Universidade Federal de Santa Maria (UFSM) instacron:UFSM |
instname_str |
Universidade Federal de Santa Maria (UFSM) |
instacron_str |
UFSM |
institution |
UFSM |
reponame_str |
Manancial - Repositório Digital da UFSM |
collection |
Manancial - Repositório Digital da UFSM |
repository.name.fl_str_mv |
Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM) |
repository.mail.fl_str_mv |
atendimento.sib@ufsm.br||tedebc@gmail.com |
_version_ |
1805922145860059136 |