Effect of residual effective alkali on eucalyptus kraft pulp yield and chemistry.

Detalhes bibliográficos
Autor(a) principal: RIBEIRO, R. A.
Data de Publicação: 2018
Outros Autores: COLODETTE, J. L., VAZ JUNIOR, S.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
Texto Completo: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1107127
Resumo: The impact of residual effective alkali (REA) and pulp deligniÀ cation degree on Eucalyptus kraft pulp yield and chemistry was investigated. In this study four types of eucalypt clones were evaluated. The eucalypt woods were cooked to kappa numbers of 14± 1, 18± 1, 22± 1 and 26± 1 using two different ranges of REA, namely: low-REA (1-2 g.L-1) and high-REA (8-9 g.L-1). In general, the low-REA cooks lead to pulps of higher yield, viscosity and xylans content and lower brightness and hexenuronic acid (HexA) content, in relation to the high-REA cooks. In addition, the low-REA cooks required about 20% less effective alkali to achieve the target kappa, in spite of demanding about 50% more H-factor. Similar trends were observed for the other woods and kappa values evaluated, but the level of gains varied substantially among woods and deligniÀ cation degrees. Among the various woods, E. globulus was the easiest to delignify. There was a trend of higher brown pulp yield for the cooks terminated at higher kappa in the range of 14-26, but the lignin-HexA free screen yields were about similar in the kappa range of 18-26 for a given wood type.
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spelling Effect of residual effective alkali on eucalyptus kraft pulp yield and chemistry.Kappa numberEucalyptusYieldsThe impact of residual effective alkali (REA) and pulp deligniÀ cation degree on Eucalyptus kraft pulp yield and chemistry was investigated. In this study four types of eucalypt clones were evaluated. The eucalypt woods were cooked to kappa numbers of 14± 1, 18± 1, 22± 1 and 26± 1 using two different ranges of REA, namely: low-REA (1-2 g.L-1) and high-REA (8-9 g.L-1). In general, the low-REA cooks lead to pulps of higher yield, viscosity and xylans content and lower brightness and hexenuronic acid (HexA) content, in relation to the high-REA cooks. In addition, the low-REA cooks required about 20% less effective alkali to achieve the target kappa, in spite of demanding about 50% more H-factor. Similar trends were observed for the other woods and kappa values evaluated, but the level of gains varied substantially among woods and deligniÀ cation degrees. Among the various woods, E. globulus was the easiest to delignify. There was a trend of higher brown pulp yield for the cooks terminated at higher kappa in the range of 14-26, but the lignin-HexA free screen yields were about similar in the kappa range of 18-26 for a given wood type.Robisnéa Adriana Ribeiro; Jorge Luiz Colodette; SILVIO VAZ JUNIOR, CNPAE.RIBEIRO, R. A.COLODETTE, J. L.VAZ JUNIOR, S.2019-03-15T18:14:11Z2019-03-15T18:14:11Z2019-03-1520182019-11-18T11:11:11Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleCerne, v. 24, n. 4, p. 56-64, 2018.http://www.alice.cnptia.embrapa.br/alice/handle/doc/1107127enginfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPA2019-03-15T18:14:18Zoai:www.alice.cnptia.embrapa.br:doc/1107127Repositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestopendoar:21542019-03-15T18:14:18falseRepositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestcg-riaa@embrapa.bropendoar:21542019-03-15T18:14:18Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Effect of residual effective alkali on eucalyptus kraft pulp yield and chemistry.
title Effect of residual effective alkali on eucalyptus kraft pulp yield and chemistry.
spellingShingle Effect of residual effective alkali on eucalyptus kraft pulp yield and chemistry.
RIBEIRO, R. A.
Kappa number
Eucalyptus
Yields
title_short Effect of residual effective alkali on eucalyptus kraft pulp yield and chemistry.
title_full Effect of residual effective alkali on eucalyptus kraft pulp yield and chemistry.
title_fullStr Effect of residual effective alkali on eucalyptus kraft pulp yield and chemistry.
title_full_unstemmed Effect of residual effective alkali on eucalyptus kraft pulp yield and chemistry.
title_sort Effect of residual effective alkali on eucalyptus kraft pulp yield and chemistry.
author RIBEIRO, R. A.
author_facet RIBEIRO, R. A.
COLODETTE, J. L.
VAZ JUNIOR, S.
author_role author
author2 COLODETTE, J. L.
VAZ JUNIOR, S.
author2_role author
author
dc.contributor.none.fl_str_mv Robisnéa Adriana Ribeiro; Jorge Luiz Colodette; SILVIO VAZ JUNIOR, CNPAE.
dc.contributor.author.fl_str_mv RIBEIRO, R. A.
COLODETTE, J. L.
VAZ JUNIOR, S.
dc.subject.por.fl_str_mv Kappa number
Eucalyptus
Yields
topic Kappa number
Eucalyptus
Yields
description The impact of residual effective alkali (REA) and pulp deligniÀ cation degree on Eucalyptus kraft pulp yield and chemistry was investigated. In this study four types of eucalypt clones were evaluated. The eucalypt woods were cooked to kappa numbers of 14± 1, 18± 1, 22± 1 and 26± 1 using two different ranges of REA, namely: low-REA (1-2 g.L-1) and high-REA (8-9 g.L-1). In general, the low-REA cooks lead to pulps of higher yield, viscosity and xylans content and lower brightness and hexenuronic acid (HexA) content, in relation to the high-REA cooks. In addition, the low-REA cooks required about 20% less effective alkali to achieve the target kappa, in spite of demanding about 50% more H-factor. Similar trends were observed for the other woods and kappa values evaluated, but the level of gains varied substantially among woods and deligniÀ cation degrees. Among the various woods, E. globulus was the easiest to delignify. There was a trend of higher brown pulp yield for the cooks terminated at higher kappa in the range of 14-26, but the lignin-HexA free screen yields were about similar in the kappa range of 18-26 for a given wood type.
publishDate 2018
dc.date.none.fl_str_mv 2018
2019-03-15T18:14:11Z
2019-03-15T18:14:11Z
2019-03-15
2019-11-18T11:11:11Z
dc.type.driver.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv Cerne, v. 24, n. 4, p. 56-64, 2018.
http://www.alice.cnptia.embrapa.br/alice/handle/doc/1107127
identifier_str_mv Cerne, v. 24, n. 4, p. 56-64, 2018.
url http://www.alice.cnptia.embrapa.br/alice/handle/doc/1107127
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv reponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron_str EMBRAPA
institution EMBRAPA
reponame_str Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
collection Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
repository.name.fl_str_mv Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv cg-riaa@embrapa.br
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