Alternative technique for evaluating yield loss in modern bleach plants
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFLA |
Texto Completo: | http://repositorio.ufla.br/jspui/handle/1/14099 |
Resumo: | In this study an alternative technique is presented and discussed for measuring yield loss based on the analysis of total organic carbon (TOC) in bleaching filtrates. Oxygen predelignified eucalyptus kraft pulp was subjected to the DHT(EP)D, D(EP)DD and D(EP)DP bleaching sequences and the gravimetric yield of each stage was determined, with 10 replicates. Then the filtrates were analyzed for TOC and COD. Correlations were established among the three measurement methods (gravimetric, COD and TOC). Yield losses in the DHT stage were more accentuated than in the D0 stage, these losses being recovered in subsequent stages of the bleaching sequence. Yield loss decreased with each advancing stage of the bleaching sequences (D0,DHT>(EP)>D1>P>D2). Yield loss increased with higher kappa factors in the first bleaching stage and with higher temperature in the (EP) stage. The final P stage resulted in greater yield losses than the final D stage. Yield loss intensifies with gain in brightness from bleaching. Yield losses as measured by the TOC method revealed a narrower range of variation in relation to the gravimetric and COD methods, and the linear equation derived for the TOC vs. gravimetric yield relationship provided the best fit (R2=97.27%). Overall yield losses throughout were in the range of 4-5%, depending on the bleaching sequence and operating conditions. |
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Alternative technique for evaluating yield loss in modern bleach plantsTécnica alternativa para avaliação de perda de rendimento em plantas modernas de branqueamentoTOCCODYieldBleachingTotal organic carbon (TOC)Carbono orgânico total (COT)RendimentoBranqueamentoIn this study an alternative technique is presented and discussed for measuring yield loss based on the analysis of total organic carbon (TOC) in bleaching filtrates. Oxygen predelignified eucalyptus kraft pulp was subjected to the DHT(EP)D, D(EP)DD and D(EP)DP bleaching sequences and the gravimetric yield of each stage was determined, with 10 replicates. Then the filtrates were analyzed for TOC and COD. Correlations were established among the three measurement methods (gravimetric, COD and TOC). Yield losses in the DHT stage were more accentuated than in the D0 stage, these losses being recovered in subsequent stages of the bleaching sequence. Yield loss decreased with each advancing stage of the bleaching sequences (D0,DHT>(EP)>D1>P>D2). Yield loss increased with higher kappa factors in the first bleaching stage and with higher temperature in the (EP) stage. The final P stage resulted in greater yield losses than the final D stage. Yield loss intensifies with gain in brightness from bleaching. Yield losses as measured by the TOC method revealed a narrower range of variation in relation to the gravimetric and COD methods, and the linear equation derived for the TOC vs. gravimetric yield relationship provided the best fit (R2=97.27%). Overall yield losses throughout were in the range of 4-5%, depending on the bleaching sequence and operating conditions.Universidade Federal de Lavras (UFLA)2015-11-022017-08-01T20:13:37Z2017-08-01T20:13:37Z2017-08-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdfLONGUE JÚNIOR, D.; COLODETTE, J. L.; ANDRADE, M. F. Alternative technique for evaluating yield loss in modern bleach plants. CERNE, Lavras, v. 15, n. 4, p. 398-406, out./dez. 2009.http://repositorio.ufla.br/jspui/handle/1/140992317-63420104-7760reponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLAenghttp://www.cerne.ufla.br/site/index.php/CERNE/article/view/682/566Copyright (c) 2015 CERNEAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessLongue Júnior, DaltonColodette, Jorge LuizAndrade, Marcela Freitas2021-08-22T20:08:46Zoai:localhost:1/14099Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2021-08-22T20:08:46Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false |
dc.title.none.fl_str_mv |
Alternative technique for evaluating yield loss in modern bleach plants Técnica alternativa para avaliação de perda de rendimento em plantas modernas de branqueamento |
title |
Alternative technique for evaluating yield loss in modern bleach plants |
spellingShingle |
Alternative technique for evaluating yield loss in modern bleach plants Longue Júnior, Dalton TOC COD Yield Bleaching Total organic carbon (TOC) Carbono orgânico total (COT) Rendimento Branqueamento |
title_short |
Alternative technique for evaluating yield loss in modern bleach plants |
title_full |
Alternative technique for evaluating yield loss in modern bleach plants |
title_fullStr |
Alternative technique for evaluating yield loss in modern bleach plants |
title_full_unstemmed |
Alternative technique for evaluating yield loss in modern bleach plants |
title_sort |
Alternative technique for evaluating yield loss in modern bleach plants |
author |
Longue Júnior, Dalton |
author_facet |
Longue Júnior, Dalton Colodette, Jorge Luiz Andrade, Marcela Freitas |
author_role |
author |
author2 |
Colodette, Jorge Luiz Andrade, Marcela Freitas |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Longue Júnior, Dalton Colodette, Jorge Luiz Andrade, Marcela Freitas |
dc.subject.por.fl_str_mv |
TOC COD Yield Bleaching Total organic carbon (TOC) Carbono orgânico total (COT) Rendimento Branqueamento |
topic |
TOC COD Yield Bleaching Total organic carbon (TOC) Carbono orgânico total (COT) Rendimento Branqueamento |
description |
In this study an alternative technique is presented and discussed for measuring yield loss based on the analysis of total organic carbon (TOC) in bleaching filtrates. Oxygen predelignified eucalyptus kraft pulp was subjected to the DHT(EP)D, D(EP)DD and D(EP)DP bleaching sequences and the gravimetric yield of each stage was determined, with 10 replicates. Then the filtrates were analyzed for TOC and COD. Correlations were established among the three measurement methods (gravimetric, COD and TOC). Yield losses in the DHT stage were more accentuated than in the D0 stage, these losses being recovered in subsequent stages of the bleaching sequence. Yield loss decreased with each advancing stage of the bleaching sequences (D0,DHT>(EP)>D1>P>D2). Yield loss increased with higher kappa factors in the first bleaching stage and with higher temperature in the (EP) stage. The final P stage resulted in greater yield losses than the final D stage. Yield loss intensifies with gain in brightness from bleaching. Yield losses as measured by the TOC method revealed a narrower range of variation in relation to the gravimetric and COD methods, and the linear equation derived for the TOC vs. gravimetric yield relationship provided the best fit (R2=97.27%). Overall yield losses throughout were in the range of 4-5%, depending on the bleaching sequence and operating conditions. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-11-02 2017-08-01T20:13:37Z 2017-08-01T20:13:37Z 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 |
LONGUE JÚNIOR, D.; COLODETTE, J. L.; ANDRADE, M. F. Alternative technique for evaluating yield loss in modern bleach plants. CERNE, Lavras, v. 15, n. 4, p. 398-406, out./dez. 2009. http://repositorio.ufla.br/jspui/handle/1/14099 |
identifier_str_mv |
LONGUE JÚNIOR, D.; COLODETTE, J. L.; ANDRADE, M. F. Alternative technique for evaluating yield loss in modern bleach plants. CERNE, Lavras, v. 15, n. 4, p. 398-406, out./dez. 2009. |
url |
http://repositorio.ufla.br/jspui/handle/1/14099 |
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/682/566 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2015 CERNE Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2015 CERNE Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ |
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 |
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_ |
1784549974616309760 |