ALTERNATIVE TECHNIQUE FOR EVALUATING YIELD LOSS IN MODERN BLEACH PALNTS
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Cerne (Online) |
Texto Completo: | https://cerne.ufla.br/site/index.php/CERNE/article/view/682 |
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 PALNTSTOCCODyieldbleachingIn 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.CERNECERNE2015-11-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://cerne.ufla.br/site/index.php/CERNE/article/view/682CERNE; Vol. 15 No. 4 (2009); 398-406CERNE; v. 15 n. 4 (2009); 398-4062317-63420104-7760reponame:Cerne (Online)instname:Universidade Federal de Lavras (UFLA)instacron:UFLAenghttps://cerne.ufla.br/site/index.php/CERNE/article/view/682/566Copyright (c) 2015 CERNEinfo:eu-repo/semantics/openAccessJúnior, Dalton LongueColodette, Jorge LuizAndrade, Marcela Freitas2015-11-06T13:44:36Zoai:cerne.ufla.br:article/682Revistahttps://cerne.ufla.br/site/index.php/CERNEPUBhttps://cerne.ufla.br/site/index.php/CERNE/oaicerne@dcf.ufla.br||cerne@dcf.ufla.br2317-63420104-7760opendoar:2024-05-21T19:54:03.890828Cerne (Online) - Universidade Federal de Lavras (UFLA)true |
dc.title.none.fl_str_mv |
ALTERNATIVE TECHNIQUE FOR EVALUATING YIELD LOSS IN MODERN BLEACH PALNTS |
title |
ALTERNATIVE TECHNIQUE FOR EVALUATING YIELD LOSS IN MODERN BLEACH PALNTS |
spellingShingle |
ALTERNATIVE TECHNIQUE FOR EVALUATING YIELD LOSS IN MODERN BLEACH PALNTS Júnior, Dalton Longue TOC COD yield bleaching |
title_short |
ALTERNATIVE TECHNIQUE FOR EVALUATING YIELD LOSS IN MODERN BLEACH PALNTS |
title_full |
ALTERNATIVE TECHNIQUE FOR EVALUATING YIELD LOSS IN MODERN BLEACH PALNTS |
title_fullStr |
ALTERNATIVE TECHNIQUE FOR EVALUATING YIELD LOSS IN MODERN BLEACH PALNTS |
title_full_unstemmed |
ALTERNATIVE TECHNIQUE FOR EVALUATING YIELD LOSS IN MODERN BLEACH PALNTS |
title_sort |
ALTERNATIVE TECHNIQUE FOR EVALUATING YIELD LOSS IN MODERN BLEACH PALNTS |
author |
Júnior, Dalton Longue |
author_facet |
Júnior, Dalton Longue 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 |
Júnior, Dalton Longue Colodette, Jorge Luiz Andrade, Marcela Freitas |
dc.subject.por.fl_str_mv |
TOC COD yield bleaching |
topic |
TOC COD yield bleaching |
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 |
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://cerne.ufla.br/site/index.php/CERNE/article/view/682 |
url |
https://cerne.ufla.br/site/index.php/CERNE/article/view/682 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://cerne.ufla.br/site/index.php/CERNE/article/view/682/566 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2015 CERNE info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2015 CERNE |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
CERNE CERNE |
publisher.none.fl_str_mv |
CERNE CERNE |
dc.source.none.fl_str_mv |
CERNE; Vol. 15 No. 4 (2009); 398-406 CERNE; v. 15 n. 4 (2009); 398-406 2317-6342 0104-7760 reponame:Cerne (Online) instname:Universidade Federal de Lavras (UFLA) instacron:UFLA |
instname_str |
Universidade Federal de Lavras (UFLA) |
instacron_str |
UFLA |
institution |
UFLA |
reponame_str |
Cerne (Online) |
collection |
Cerne (Online) |
repository.name.fl_str_mv |
Cerne (Online) - Universidade Federal de Lavras (UFLA) |
repository.mail.fl_str_mv |
cerne@dcf.ufla.br||cerne@dcf.ufla.br |
_version_ |
1799874941515988992 |