Influência do grau de deslignificação na produção de polpa Kraft branqueada de eucalipto

• Autor(a) principal: Almeida, Diego Pierre de
• Data de Publicação: 2010
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/5904
• topic: Produção de polpa Kraft branqueada; Polpa Kraft branqueada de eucalipto; Deslignificação; Production of bleached kraft pulp; Bleached eucalyptus kraft pulp; Delignification; CNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL::TECNOLOGIA E UTILIZACAO DE PRODUTOS FLORESTAIS::TECNOLOGIA DE CELULOSE E PAPEL

The main objective of this study was to investigate the feasibility of production of eucalyptus kraft pulp at higher kappa number (20-25), aiming to increase production, economy of reagents for pulping, improving the viscosity and the physical-mechanical properties bleached pulp. We used industry wood chips, characterized as "mix of eucalyptus” and diluted black liquor. We evaluated four levels of delignification (kappa 17, 19, 22 and 25) and made LoSolids cooking with and without the mixture of anthraquinone and surfactant. For the pulps produced were evaluated for production increase, the charge for alkaline cooking, the solids content of black liquor, the cost of bleaching, the pulp viscosity and changes in the quality of the final paper. The cooking with kappa 22 showed greater gains in R$/tad of pulp produced, for cooking without additives (gain of R$10.47 for pulp K22), and for the pulping with additives (a gain of R$12.75 for pulp K22AQ ). The alkali charge was reduced to 4.0% for pulp K22 and 3.6% for pulp K22AQ, providing less load to the recovery boiler and without the production of shives. There was a reduction of solids content of black liquor, but in amounts that will not interfere in the energy matrix of factory. The cost of the bleaching reagents increased (increase factory. The cost of the bleaching reagents increased (increase of R $ 12.49 for pulp K22 and R$16.56 for pulp K22AQ), but the balance at the end of the process was positive. The pulp viscosity was 3.2 cP K22 greater than the reference, and for pulp K22AQ the increase was 3.8 cP. The increase in kappa number to 22 provided an improvement in physical and mechanical properties such as increased modulus of elasticity, resistance to air flow, burst index and tensile index and reduced bulk, when evaluated as a function of energy consumption refining.