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Kinetics of the removal of Eucalyptus grandis wood extractives during Kraft pulping/Cinetica da remocao dos extrativos da madeira de Eucalyptus grandis durante polpacao Kraft

Acta scientiarum. Technology, 2010-07, Vol.32 (3), p.227 [Peer Reviewed Journal]

COPYRIGHT 2010 Universidade Estadual de Maringa ;ISSN: 1806-2563 ;EISSN: 1807-8664 ;DOI: 10.4025/actascitechnol.v32i3.4237

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  • Title:
    Kinetics of the removal of Eucalyptus grandis wood extractives during Kraft pulping/Cinetica da remocao dos extrativos da madeira de Eucalyptus grandis durante polpacao Kraft
  • Author: Sarto, Camila ; Sansigolo, Claudio Angeli
  • Is Part Of: Acta scientiarum. Technology, 2010-07, Vol.32 (3), p.227
  • Description: The objective of this work was to study the kinetics of the removal of Eucalyptus grandis wood extractives during Kraft pulping. The pulping was done in steel tubular reactors using wood saw under the following conditions: active alkali = 14%, sulfidity = 25%; liquor-to-wood ratio = 10 L [kg.sup.-1] of dry wood; and temperatures of 130, 150, 160 and 180°C during 30, 60, 90, 120, 150 and 180 minutes. After pulping, analyses were conducted of the yield and extractives in residue (pulp and reject).Total extractives (ethyl alcohol-toluene (1:2), ethyl alcohol and hot water, respectively) and soluble extractives in acetone were analyzed. The results showed that most extractives are degraded in the first 30 minutes of the pulping process. It was observed that the removal occurs in two different stages: the first is rapid, where the majority of the extractives are removed, and the last is slow, where few extractives are removed. Key words: Eucalyptus grandis, extractives, Kraft pulping process. O trabalho teve por objetivo estudar a cinetica da remocao dos extrativos da madeira de Eucalyptus grandis durante polpacao Kraft. As polpacoes foram efetuadas em reatores tubulares de aco, usando-se madeira na forma de serragem nas seguintes condicoes: alcali ativo = 14%, sulfidez = 25%, relacao licor / madeira = 10 L [kg.sup.-1] de madeira seca e temperaturas de 130, 150, 160 e 180°C durante tempos de 30, 60, 90, 120, 150 e 180 min. Apos as polpacoes foram realizadas analises do rendimento bruto e de extrativos totais no residuo (polpa + rejeitos). Foram determinados extrativos totais (alcool etilico-tolueno (1:2), alcool etilico e agua quente, respectivamente) e extrativos soluveis em acetona. Os resultados mostraram que a maioria dos extrativos e degradada nos primeiros 30 min. do processo de polpacao. Observou-se que a remocao ocorre em duas fases bem distintas: a primeira, rapida, quando a maioria dos extrativos e removida e a ultima, lenta, quando pequena fracao dos extrativos e removida. Palavras-chave: Eucalyptus grandis, extrativos, polpacao Kraft.
  • Publisher: Universidade Estadual de Maringa
  • Language: Spanish
  • Identifier: ISSN: 1806-2563
    EISSN: 1807-8664
    DOI: 10.4025/actascitechnol.v32i3.4237
  • Source: DOAJ Directory of Open Access Journals
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