Residual Lignin Effect
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. The distribution of Lignin and Xylan in the Inner and Surface Layers of the Fiber from Eucalyptus Kraft Pulp and its Effects on Oxygen Delignification
The chemical structure and composition of lignin and hemicellulose, as well as the distribution between inner and outer layers of fiber, can adversely affect bleaching operations or fiber-fiber bond on pulp and, consequently the papermaking process. Herein, we have implemented the fractionation and mechanical peeling techniques in order to identify the fines
Mat. Res.. Publicado em: 22/06/2017
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2. CARACTERIZAÇÃO QUÍMICA E DIGESTIBILIDADE IN VITRO DE LEGUMINOSAS FORRAGEIRAS TROPICAIS COM FOCO NO EFEITO DE COMPOSTOS FENÓLICOS E IDADE DA PLANTA. / CHEMICAL AND IN VITRO DIGESTIBILITY OF TROPICAL FORAGE LEGUMES FOCUSING ON THE EFFECT OF PHENOLIC COMPOUNDS AND PLANT AGE.
It were evaluated the gas production from tropical legumes with forage potential, including sun hemp (Crotalaria juncea), indian rattlebox (Crotalaria spectabilis), pigeon pea (Cajanus cajan), perennial horse gram (Macrotyloma axillare), cowage (Mucuna aterrina) wild groundnut (Calopogonium mucunoides) stylosanthes Campo Grande (Stylosantis sp .) and jack-be
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2011
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3. Identificação de constituintes químicos potencialmente envolvidos na reversão de alvura de polpa Kraft branqueada pelas seqüências OZDHT (PO)D e OZ/EDP / Chemical representatives identification potentially involved in the reversion of whiteness of pulp kraft whitened by the sequences OZDHT(PO)D and OZIEDP
The pulp and paper section significantly contributes to the Brazilian economy. The industries produces million of tons of pulp yearly, yielding superavit of billion of dollars in the section of paper and pulp. The quality of Kraft cellulose commercialized in the international marked is evaluated, mainly because of its physical properties, anatomical characte
Publicado em: 2005
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4. Effect of hydrogen peroxide and chlorite ion residual on an activated sludge system of bleached kraft pulp mills / Efeito do residual de peróxido de hidrogênio e do íon clorito em um sistema de lodos ativados de indústrias de celulose kraft branqueada
Hydrogen peroxide and chlorine dioxide has been largelly used in bleaching plants of bleached kraft pulp mills, to delignify and to whiten the pulp, giving to it high quality, specially brightness. However, in some transient situations, such changes in the raw material, in the bleaching sequences, or in production, high charges of oxidants are required to ma
Publicado em: 2002
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5. Effect of Residual Lignin Type and Amount on Bleaching of Kraft Pulp by Trametes versicolor
The white rot fungus Trametes (Coriolus) versicolor can delignify and brighten unbleached hardwood kraft pulp within a few days, but softwood kraft pulps require longer treatment. To determine the contributions of higher residual lignin contents (kappa numbers) and structural differences in lignins to the recalcitrance of softwood kraft pulps to biobleaching
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6. Effect of manganese on preferential degradation of lignin by Pleurotus ostreatus during solid-state fermentation.
Practical utilization of the polysaccharides in the lignocellulosic complex is limited because of the high lignin content of the complex. In this study we focused on the effect of Mn on lignin and cellulose biodegradation during solid-state fermentation by the edible mushroom Pleurotus ostreatus. Preferential degradation of lignin was enhanced by the additio
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7. Relationship between Fungal Biomass Production and the Brightening of Hardwood Kraft Pulp by Coriolus versicolor
The white-rot fungus Coriolus versicolor increased the brightness of hardwood kraft pulp by two mechanisms depending on the concentration of available nitrogen. In low-nitrogen conditions, the brightening process was a chemical effect mediated by the fungus, associated with the removal of residual lignin in the pulp; kappa number was used as an indicator of