Potencial da madeira Eucalyptus benthamii Maiden et Cambage visando à produção de celulose Kraft / Potential of Eucalyptus benthamii Maiden et Cambage wood for kraft pulp production

AUTOR(ES)

Isabel Cristina Nogueira Alves

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

22/02/2010

RESUMO

The purpose of this study was to evaluate the quality of Eucalyptus benthamii wood for kraft pulp production. Probably the most planted Eucalyptus clone in Brazil, a hybrid of Eucalyptus urophylla x Eucalyptus grandis, was also analyzed for comparison purposes. The wood characteristics analyzed were the basic density and chemical composition. Laboratory pulping was carried out to obtain pulps with kappa number 17 and their effectiveresidual alkali, screen yield and viscosity of pulp. The pulps were bleached by OD(EP)DP sequence to reach 901%ISO. The bleached pulps were refined and theiroptical and physica-mechanical properties were determined. The Eucalyptus benthamii wood presented an anatomical structure, basic density and fiber dimensions quite similar to those of other eucalypts species planted by the Brazilian pulp industry. However, it presented poorer wood quality characteristics when compared to the hybrid urograndis species, with higher amounts of extractives and lignin, lower amount of glucans, more galactans and lower S/G ratio, characteristics favoring lower pulping yield. During oxygen delignification Eucalyptus benthamii pulp resulted in higher brightness gain and higher kappa number decrease, but lower selectivity. The viscosity difference between the initial brown pulp and oxygen delignified pulp was reduced after bleaching. The Eucalyptus benthamii wood proved to be less attractive for kraft pulp production because presented lower screened yield, lower viscosity and requiring greater alkali charge for cooking. However, after bleaching and refining the disadvantages were minimized, since the bleached pulps behaved very similar, including physical and mechanical properties.

ASSUNTO(S)

celulose eucalyptus benthamii madeira kraft tecnologia e utilizacao de produtos florestais eucalyptus benthamii cellulose wood kraft

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