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An enzyme-catalysed bleaching treatment to meet dissolving pulp characteristics for cellulose derivatives applications

info:eu-repo/semantics/openAccess ;ISSN: 0960-8524 ;EISSN: 1873-2976 ;DOI: 10.1016/j.biortech.2013.08.104

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  • Title:
    An enzyme-catalysed bleaching treatment to meet dissolving pulp characteristics for cellulose derivatives applications
  • Author: Quintana, Elisabet ; Valls Vidal, Cristina ; Vidal Lluciá, Teresa ; Roncero Vivero, María Blanca
  • Subjects: Biobleaching ; Bioprocess ; Blanqueig ; Blanqueig de pastes ; Bleaching ; Cellulose fibers ; Dissolving pulp ; Enginyeria paperera ; Fibres de cel·lulosa ; Laccas ; Pasta paperera ; Violuric acid ; Àrees temàtiques de la UPC
  • Description: Bleached cellulose with good end-properties (_90% ISO brightness and 62% cellulose preservation) was obtained by using a totally chlorine-free biobleaching process (TCF). Unbleached sulphite cellulose was treated with Trametes villosa laccase in combination with violuric acid. This enzymatic stage (L) was followed by a chelating stage (Q) and then by a hydrogen peroxide stage reinforced with pressurized oxygen (Po), resulting to an overall LQPo sequence. The use of violuric acid was dictated by the results of a preliminary study, where the bleaching efficiency of various natural (syringaldehyde and p-coumaric acid) and synthetic mediators (violuric acid and 1-hydroxybenzotriazole) were assessed. The outstanding results obtained with laccase-violuric acid system fulfil most of the characteristics of commercial dissolving pulp, totally acceptable for viscose manufacturing or CMC derivatives, with the added advantage that the enzymatic treatment saved 2 h of reaction time and about 70% of hydrogen peroxide consumption, relative to a conventional sequence (Po)
  • Creation Date: 2013-11
  • Language: English
  • Identifier: ISSN: 0960-8524
    EISSN: 1873-2976
    DOI: 10.1016/j.biortech.2013.08.104
  • Source: Recercat
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