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Integrating laccase-mediator treatment into an industrial-type sequence for totally chlorine-free bleaching of eucalypt kraft pulp

AuthorsIbarra, David ; Camarero, Susana ; Romero, Javier; Martínez, María Jesús ; Martínez, Ángel T.
laboratory reactor
laccase–mediator system
totally-chlorine free sequence
eucalypt kraft pulp
Issue Date2006
CitationJournal of Chemical Technology and Biotechnology 81(7): 1159-1165(2006)
AbstractEnzymatic delignification using the high-redox potential thermostable laccase from the fungus Pycnoporus cinnabarinus and a chemical mediator (1-hydroxybenzotriazole) was investigated to improve totally chlorine-free (TCF) bleaching of Eucalyptus globulus kraft pulps. Different points of incorporation of the enzyme treatment into an industrial-type bleaching sequence (consisting of double oxygen, chelation and peroxide stages) were investigated in pressurized laboratory reactors. The best final pulp properties were obtained using an OOLQPoP sequence, where a laccase–mediator stage (L) was incorporated between double oxygen and chelation. The worse results, when the enzymatic and chelation treatments were combined in a unique stage, seemed related to partial inhibition of laccase-mediator activity by the chelator. The new TCF sequence including the laccase stage permitted to improve eucalypt pulp delignification to values around kappa 5 (hexenuronic acid contribution over 50%) compared to kappa 7 using only TCF chemical reagents. In a similar way, the final brightness obtained, over 91% ISO, was 3–4 points higher than that obtained in the chemical sequences. Although technical and economic issues are to be solved, the results obtained show the feasibility of integrating a laccase–mediator treatment into a TCF sequence for bleaching eucalypt kraft pulp. Copyright © 2006 Society of Chemical Industry
Description7 páginas, 5 figuras, 1 tabla -- PAGS nros. 1159-1165
Publisher version (URL)http://dx.doi.org/10.1002/jctb.1485
Appears in Collections:(CIB) Artículos
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