An improved TCF sequence for biobleaching kenaf pulp: Influence of the hexenuronic acid content and the use of xylanase

Autor: Glòria Andreu, Teresa Vidal
Přispěvatelé: 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
Rok vydání: 2014
Předmět:
IMPACT
Lignin
Waste Disposal
Fluid
KRAFT PULPS
Peroxide
Kenaf
Bleaching Agents
chemistry.chemical_compound
Fiber
NATURAL MEDIATOR SYSTEMS
Waste Management and Disposal
Trametes
biology
Viscosity
Hexuronic Acids
Pulp (paper)
General Medicine
Pulp and paper industry
Paper -- Blanqueig
Enginyeria paperera::Pasta paperera::Blanqueig de pastes [Àrees temàtiques de la UPC]
Hibiscus
TCF bleaching sequence
Xylanase
Laccase-mediator system (LMS)
Chlorine
Biotechnology
Wood-pulp--Bleaching
Environmental Engineering
CHEMICAL PULPS
Bioengineering
engineering.material
stomatognathic system
Pasta de paper -- Blanqueig
ECF
Cellulose
Kenaf--Technological innovation
Xylanases--Industrial applications
Biological Oxygen Demand Analysis
Laccase
Kenak
fibra de -- Blanqueig
Endo-1
4-beta Xylanases
Enginyeria paperera::Primeres matèries papereres::Fustes papereres [Àrees temàtiques de la UPC]
Renewable Energy
Sustainability and the Environment
biology.organism_classification
Kraft pulping
Hexenuronic acids
chemistry
Reagent
engineering
Zdroj: Recercat. Dipósit de la Recerca de Catalunya
Universitat Jaume I
UPCommons. Portal del coneixement obert de la UPC
Universitat Politècnica de Catalunya (UPC)
ISSN: 0960-8524
DOI: 10.1016/j.biortech.2013.11.014
Popis: 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.
Databáze: OpenAIRE
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