Título:
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An improved TCF sequence for biobleaching kenaf pulp: influence of the hexenuronic acid content and the use of xylanase
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Autor/a:
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Andreu Terrén, Glòria; Vidal Lluciá, Teresa
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Otros autores:
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Química; Universitat Politècnica de Catalunya. Departament d'Enginyeria Tèxtil i Paperera; Universitat Politècnica de Catalunya. CELBIOTECH - Grup de Recerca: Enginyeria Paperera |
Abstract:
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Enzymatic delignification with laccase from Trametes villosa used in combination with chemical mediators (acetosyringone, acetovanillone and 1-hydroxybenzotriazole) to improve the totally chlorine-free (TCF) bleaching of kenaf pulp was studied. The best final pulp properties were obtained by using an L-HBT-QPo sequence developed by incorporating a laccase-mediator stage into an industrial bleaching sequence involving chelation and peroxide stages. The new sequence resulted in increased kenaf pulp delignification (90.4%) and brightness (77.2%ISO) relative to a conventional TCF chemical sequence (74.5% delignification and 74.5% brightness). Also, the sequence provided bleached kenaf fibers with high cellulose content (pulp viscosity of 890 g . mL (1) vs 660 g . mL (1)). Scanning electron micrographs revealed that xylanase altered fiber surfaces and facilitated reagent access as a result. However, the LHBTX (xylanase) stage removed 21% of hexenuronic acids in kenaf pulp. These recalcitrant compounds spent additional bleaching reagents and affected pulp properties after peroxide stage. (C) 2013 Elsevier Ltd. All rights reserved. |
Materia(s):
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-Àrees temàtiques de la UPC::Enginyeria paperera::Pasta paperera::Blanqueig de pastes -Àrees temàtiques de la UPC::Enginyeria paperera::Primeres matèries papereres::Fustes papereres -Wood-pulp--Bleaching -Kenaf--Technological innovation -Xylanases--Industrial applications -Kraft pulping -Kenaf -TCF bleaching sequence -Laccase-mediator system (LMS) -Hexenuronic acids -Xylanase -NATURAL MEDIATOR SYSTEMS -KRAFT PULPS -CHEMICAL PULPS -IMPACT -ECF -Kenak, fibra de -- Blanqueig -Paper -- Blanqueig -Pasta de paper -- Blanqueig |
Derechos:
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Tipo de documento:
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Artículo - Versión publicada Artículo |
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