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Performance of new and commercial xylanases for ECF and TCF bleaching of eucalyptus kraft pulp
Valls Vidal, Cristina; Gallardo Román, Óscar; Vidal Lluciá, Teresa; Pastor Blasco, Francisco I. Javier; Díaz Lucea, Pilar; Roncero Vivero, María Blanca
Universitat Politècnica de Catalunya. Departament d'Enginyeria Tèxtil i Paperera; Universitat Politècnica de Catalunya. CIPAGRAF - Grup de Recerca Paperer i Gràfic
Since xylanases can differ widely in their bleaching efficiency, the performance of one new and two commercial xylanases was evaluated in an eucalyptus kraft pulp following XD (X: xylanase; D: chlorine dioxide) and XP (P: hydrogen peroxide) sequences. The new xylanase did not show a significant bleach boosting effect but increased the hexenuronic acid (HexA) removal by 10% after the D stage. The two commercial xylanases behaved in a different way, being one of them (XC) the most effective in increasing delignification (9%) and brightness (3%ISO). Its effectiveness was related to its greater action on releasing the xylan polymer, thus producing also a strong decrease in the HexA contents during the enzymatic stage (15%). All xylanases produced morphological changes in the fibre surfaces, but only with XC cracks and holes that improved the diffusion of reactives were observed. Finally, the best bleaching results were obtained with the XD sequence and therefore, a complete bleaching sequence XDEopD1 (Eop: alkaline extraction with oxygen and peroxide) was carried out with the best enzyme
Àrees temàtiques de la UPC::Enginyeria paperera::Pasta paperera::Fabricació de pastes
Àrees temàtiques de la UPC::Enginyeria paperera::Impacte ambiental
Wood-pulp-Bleaching
Paper -- Blanqueig
info:eu-repo/semantics/publishedVersion
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