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Enzymatically treated sulphite pulp to give dissolving-pulp characteristics
Quintana, Elisabet; Valls Vidal, Cristina; Vidal Lluciá, Teresa; Roncero Vivero, María Blanca
Universitat Politècnica de Catalunya. Departament d'Enginyeria Tèxtil i Paperera; Universitat Politècnica de Catalunya. CELBIOTECH - Grup de Recerca: Enginyeria i Biotecnologia de Materials Lignocel·lulòsics
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)
Àrees temàtiques de la UPC::Enginyeria paperera::Pasta paperera::Blanqueig de pastes
Àrees temàtiques de la UPC::Enginyeria paperera::Primeres matèries papereres::Cel·lulosa
Cellulose
Wood--Chemistry
Wood-pulp--Bleaching
Biobleaching
Dissolving pulp
Sulphite pulp
Violuric acid
Polpa de fusta -- Blanqueig
Cel·lulosa per a paper
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