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Enzymatically treated sulphite pulp to give dissolving-pulp characteristics

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Title:
Enzymatically treated sulphite pulp to give dissolving-pulp characteristics
Author: Quintana, Elisabet ; Valls Vidal, Cristina ; Vidal Lluciá, Teresa ; Roncero Vivero, María Blanca
Subjects: Biobleaching ; Blanqueig ; Blanqueig de pastes ; Bleaching ; Cellulose ; Cel·lulosa ; Cel·lulosa per a paper ; Chemistry ; Dissolving pulp ; Enginyeria paperera ; Pasta paperera ; Polpa de fusta ; Primeres matèries papereres ; Sulphite pulp ; Violuric acid ; Wood ; Wood-pulp ; Àrees temàtiques de la UPC
Description: Bleached cellulose with good end-properties (~90% ISO brightness, < 0.5 kappa number and substantially preserved cellulose integrity) was obtained by using a totally chlorine-free (TCF) biobleaching sequence. The initial pulp was subjected to an overall LQPo sequence. Unbleached sulphite cellulose was treated with Trametes villosa laccase (L) in combination with violuric acid (VA). This enzymatic stage was followed by a chelating stage (Q) and then by a hydrogen peroxide stage reinforced with pressurized oxygen (Po). The use of violuric acid was dictated by the results of a preliminary study, where the bleaching efficiency of various natural (syringaldehyde and pcoumaric acid) and synthetic mediators (violuric acid and 1-hydroxybenzotriazole) were assessed. The outstanding results obtained with laccase-violuric acid system fulfil the characteristics of commercial dissolving-grade pulp with the added advantage that the enzymatic treatment saved 2h of reaction time and about 70% of hydrogen peroxide consumption, relative to a conventional hydrogen peroxide sequence (Po)
Creation Date: 2013
Language: English
Source: Recercat

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Enzymatically treated sulphite pulp to give dissolving-pulp characteristics

info:eu-repo/semantics/openAccess

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