Performance of the woods of Eucalyptus grandis x Eucalyptus urophylla and Acacia mearnsii for the production of kraft pulp on Lo-Solids® process, 2011 PEERS Conference

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Species of Acacia are used in Asia for the pulp production. In Brazil, despite the adaptability of these species to the Brazilian soil and climatic conditions, the wood of Acacia is not used for the pulp production in industrial scale, where the hybrid of Eucalyptus grandis x Eucalyptus urophylla is the major species. The objectives of this work are to compare the performance of Eucalyptus grandis x Eucalyptus urophylla and Acacia mearnsii planted in Brazil for bleached kraft pulp production by modified kraft cook process, and to analyze the impact of the pulp delignification level on the bleaching process and physical characteristics of bleached pulp. The results shows that Acacia’s wood has higher basic density, extractives and holocellulose content, and lower proportion of lignin than Eucalyptus’ wood. Among the analyzed species, A. mearnsii presents better yields on pulping despite the higher H Factor and alkali applied, and superior oxygen delignification efficiency. On bleaching, pulps with higher initial kappa consume more reagents and have better final viscosity. The bleached pulps of Acacia demands lower refining energy and presents better tensile index, breaking length and burst index, and lower bulk, tear index and Klemm capilarity than Eucalyptus’s bleached pulps.