Evaluation of bleachability on pine and eucalyptus kraft pulps

In recent decades, the pulp industry has been changing and improving its manufacturing processes in order to enhance production capacity, product quality and environmental performance. The aim of this study was to evaluate the bleachability effect on the efficient washing and alkaline leaching in eu...

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Bibliographic Details
Published in:CERNE 2013-09, Vol.19 (3), p.433-439
Main Authors: Andrade, M.F, Colodette, J.L, Oliveira, F.N
Format: Article
Language:English
Subjects:
CLARIFICACIA³N
CLARIFICATION
CLARIFICAÇÃO
CLARIFYING
EUCALIPTO
EUCALYPTUS
FORESTRY
http://www.fao.org/aos/agrovoc#c_15591
http://www.fao.org/aos/agrovoc#c_1652
http://www.fao.org/aos/agrovoc#c_2683
http://www.fao.org/aos/agrovoc#c_4329
http://www.fao.org/aos/agrovoc#c_5890
http://www.fao.org/aos/agrovoc#c_6364
LEACHING
LESSIVAGE DU SOL
LIGNINA
LIGNINAS
LIGNINE
LIGNINS
LIXIVIACIA³N
LIXIVIAÇÃO
PAOTE CELLULOSIQUE
PASTA
PINHEIRO
PINUS
POLPA
PULP
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Summary:In recent decades, the pulp industry has been changing and improving its manufacturing processes in order to enhance production capacity, product quality and environmental performance. The aim of this study was to evaluate the bleachability effect on the efficient washing and alkaline leaching in eucalyptus and pine Kraft pulps using three different bleaching sequences: AD(EP)D, A/D(EP)DP and D HT(EP)DP. This study was carried out in two stages. In the first part, the optimum conditions for pulp bleaching in order to achieve a brightness of 90% ISO were established. The second step was a comparative study between the pulps that received alkaline leaching and efficient washing with reference pulp (without treatment). The brightness, viscosity, kappa number and HexA in pulp were analyzed. The three sequences studied reached the desired brightness, but the sequence AD(EP)D produced a lower reagent consumption for the same brightness. In the three sequences studied, the efficient washing of the pulp after oxygen delignification has contributed significantly to the removal of dissolved organic and inorganic materials in the pulp and the alkaline leaching decreased significantly the pulp kappa number due to a higher pulp delignification and bleachability.
ISSN:0104-7760
2317-6342
0104-7760
2317-6342
DOI:10.1590/S0104-77602013000300010