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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
19/07/2010 |
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Data da última atualização: |
22/03/2011 |
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Autoria: |
LONGUE JÚNIOR, D.; COLODETTE, J. L.; ANDRADE, M. F. |
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Afiliação: |
Dalton Longue Júnior; Jorge Luiz Colodette; Marcela Freitas Andrade. |
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Título: |
Alternative technique for evaluating yield loss in modern bleach plants. |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
Cerne, Lavras, v. 15, n. 4, p. 398-406, out./dez. 2009. |
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Idioma: |
Inglês |
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Conteúdo: |
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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Palavras-Chave: |
Bleach; COD; TOC; Yield. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01888naa a2200193 a 4500
001 1858051
005 2011-03-22
008 2009 bl uuuu u00u1 u #d
100 1 $aLONGUE JÚNIOR, D.
245 $aAlternative technique for evaluating yield loss in modern bleach plants.
260 $c2009
520 $aIn 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.
653 $aBleach
653 $aCOD
653 $aTOC
653 $aYield
700 1 $aCOLODETTE, J. L.
700 1 $aANDRADE, M. F.
773 $tCerne, Lavras$gv. 15, n. 4, p. 398-406, out./dez. 2009.
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Registro original: |
Embrapa Florestas (CNPF) |
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| Registros recuperados : 10 | |
| 4. |  | RIBEIRO, R. A.; VAZ JUNIOR, S.; JAMEEL, H.; CHANG, HOU-MIN; NARRON, R.; JIANG, X.; COLODETTE, J. L. Chemical study of kraft lignin during alkaline delignification of E. urophylla x E. grandis hybrid in low and high residual effective alkali. ACS Sustainable Chemistry e Engineering, v.7, p. 10274-10282, 2019.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Agroenergia. |
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| 7. | | ZANUNCIO, A. J. V.; CARVALHO, A. G.; CARNEIRO, A. de C. O.; VALENZUELA, P.; GACITÚA, W.; LEITE, F. P.; COLODETTE, J. L. Characterization of eucalyptus clones subject to wind damage. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 52, n, 11, p. 968-976, novembro 2017. Título em português: Caracterização de clones de eucalipto sujeitos a danos provocados pelo vento.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 10. | | BUFALINO, L.; SENA NETO, A. R. de; TONOLI, G. H. D.; FONSECA, A. de S.; COSTA, T. G.; MARCONCINI, J. M.; COLODETTE, J. L.; LABORY, C. R. G.; MENDES, L. M. How the chemical nature of Brazilian hardwoods affects nanofibrillation of cellulose fibers and film optical quality. Cellulose, [S. l.], v. 22, p. 3657-3672, 2015.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Instrumentação. |
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| Registros recuperados : 10 | |
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