Potencial da madeira Eucalyptus benthamii Maiden et Cambage visando à produção de celulose Kraft

• Ano de defesa: 2010
• Autor(a) principal: Alves, Isabel Cristina Nogueira
• Orientador(a): Gomide, José Lívio
• Banca de defesa: Mokfienski, Alfredo , Carvalho, Ana Márcia Macedo Ladeira
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Ciência Florestal
• Departamento: Manejo Florestal; Meio Ambiente e Conservação da Natureza; Silvicultura; Tecnologia e Utilização de
• País: BR
• Palavras-chave em Português: Eucalyptus benthamii; Celulose; Madeira; Kraft
• Palavras-chave em Inglês: Eucalyptus benthamii; Cellulose; Wood; Kraft
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL::TECNOLOGIA E UTILIZACAO DE PRODUTOS FLORESTAIS
• Link de acesso: http://locus.ufv.br/handle/123456789/3031

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 90±1%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.