Recombinant manganese peroxidase (rMnP) from Pichia pastoris. Part 2: Application in TCF and ECF bleaching
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Haowen Xu
Abstract
The recombinant manganese peroxidase (rMnP) produced from the yeast Pichia pastoris has been investigated in totally chlorine free (TCF) and elemental chlorine free (ECF) bleaching sequences for improving the bleachability of kraft pulps. In TCF bleaching, oxygen delignified hardwood kraft pulp was treated with rMnP, followed by a sequence combining a chelating and alkaline peroxide bleaching stage. The inclusion of the enzymatic treatment significantly improved the pulp brightness to a level that is difficult to obtain by chemical bleaching alone. Furthermore, the treatment with rMnP resulted in energy savings during pulp refining with PFI mill with a slight improvement in pulp strength properties such as tensile index and burst index. In ECF bleaching, a significant reduction in chlorine dioxide consumption was obtained. A three-stage rMnP treatment combined with alkaline extraction, followed by DED bleaching sequence for hardwood kraft pulp (HWKP) or DEDED bleaching sequence for softwood kraft pulp (SWKP), reduced the total effective chlorine by 41% and 32% for HWKP and SWKP, respectively, compared with the conventional bleaching sequences without enzymatic treatment. The strength properties of the enzyme-treated pulp were also slightly better than that of the control pulp. Further reductions in the consumption of total effective chlorine were obtained when a xylanase pretreatment was incorporated into the bleaching sequence before the repeated rMnP treatment.
©2010 by Walter de Gruyter Berlin New York
Articles in the same Issue
- Original Papers
- Recombinant manganese peroxidase (rMnP) from Pichia pastoris. Part 1: Kraft pulp delignification
- Recombinant manganese peroxidase (rMnP) from Pichia pastoris. Part 2: Application in TCF and ECF bleaching
- The role of hydroxyl and oxyl anion radicals in selectivity of oxygen delignification
- Thermal aging of 1-alkyl-3-methylimidazolium ionic liquids and its effect on dissolved cellulose
- Synchrotron X-ray fiber diffraction study on the thermal expansion behavior of cellulose crystals in tension wood of Japanese poplar in the low-temperature region
- Studies on the dehydrogenative polymerization of monolignol β-glycosides. Part 6: Monitoring of horseradish peroxidase-catalyzed polymerization of monolignol glycosides by GPC-PDA
- Reactivity of syringyl quinone methide intermediates in dehydrogenative polymerization. Part 2: pH effect in horseradish peroxidase-catalyzed polymerization of sinapyl alcohol
- Fractionation, analysis, and PCA modeling of properties of four technical lignins for prediction of their application potential in binders
- New model for predicting tensile strength and density of eucalyptus handsheets based on an activation parameter calculated from fiber distribution characteristics
- Extractives of the tropical wood wallaba (Eperua falcata Aubl.) as natural anti-swelling agents
- Surface properties of extracts from cork black condensate
- Effect of helium DBD plasma treatment on the surface of wood samples
- Preparation of thermoplastic molding from steamed Japanese beech flour
- Alteration of the unsteady sorption behaviour of maple (Acer pseudoplatanus L.) and spruce (Picea abies (L.) Karst.) due to thermal modification
- Towards improved understanding of PEG-impregnated waterlogged archaeological wood: A model study on recent oak
- Determination of the change in appearance of lumber surfaces illuminated from various directions
- A study of water exchange in wood by means of 2D NMR relaxation correlation and exchange
- Measurement of surface growth stress in Eucalyptus nitens Maiden by splitting a log along its axis
- Obituary
- Dion Chen-Loung Chen (1930–2009)
- Meetings
- Meetings
Articles in the same Issue
- Original Papers
- Recombinant manganese peroxidase (rMnP) from Pichia pastoris. Part 1: Kraft pulp delignification
- Recombinant manganese peroxidase (rMnP) from Pichia pastoris. Part 2: Application in TCF and ECF bleaching
- The role of hydroxyl and oxyl anion radicals in selectivity of oxygen delignification
- Thermal aging of 1-alkyl-3-methylimidazolium ionic liquids and its effect on dissolved cellulose
- Synchrotron X-ray fiber diffraction study on the thermal expansion behavior of cellulose crystals in tension wood of Japanese poplar in the low-temperature region
- Studies on the dehydrogenative polymerization of monolignol β-glycosides. Part 6: Monitoring of horseradish peroxidase-catalyzed polymerization of monolignol glycosides by GPC-PDA
- Reactivity of syringyl quinone methide intermediates in dehydrogenative polymerization. Part 2: pH effect in horseradish peroxidase-catalyzed polymerization of sinapyl alcohol
- Fractionation, analysis, and PCA modeling of properties of four technical lignins for prediction of their application potential in binders
- New model for predicting tensile strength and density of eucalyptus handsheets based on an activation parameter calculated from fiber distribution characteristics
- Extractives of the tropical wood wallaba (Eperua falcata Aubl.) as natural anti-swelling agents
- Surface properties of extracts from cork black condensate
- Effect of helium DBD plasma treatment on the surface of wood samples
- Preparation of thermoplastic molding from steamed Japanese beech flour
- Alteration of the unsteady sorption behaviour of maple (Acer pseudoplatanus L.) and spruce (Picea abies (L.) Karst.) due to thermal modification
- Towards improved understanding of PEG-impregnated waterlogged archaeological wood: A model study on recent oak
- Determination of the change in appearance of lumber surfaces illuminated from various directions
- A study of water exchange in wood by means of 2D NMR relaxation correlation and exchange
- Measurement of surface growth stress in Eucalyptus nitens Maiden by splitting a log along its axis
- Obituary
- Dion Chen-Loung Chen (1930–2009)
- Meetings
- Meetings
