Voltammetric analysis of the bleachability of softwood kraft pulps
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Robert Bourbonnais
Abstract
Kraft and oxygen delignified pulps with various kappa numbers were prepared from black spruce and western hemlock chips. The bleachability (ratio of kappa number decrease to chlorine dioxide applied) of the different pulps at the same kappa number varied with both wood furnish and delignification process. Thus, unbleached kappa number alone is not a reliable indicator of bleachability for these pulps. This may be due in part to the variable hexenuronic acid content of the pulps; those with higher ratio of hexenuronic acid content to kappa number (HexA/kappa) are harder to bleach. Voltammetric analysis of the same kraft pulps in the presence of redox mediators was found to measure both the content and reactivity of residual lignin. Peak current ratios of redox mediators correlated with pulp bleachability for all pulps. These ratios may therefore provide a more accurate prediction of bleachability than unbleached kappa number.
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© Walter de Gruyter
Articles in the same Issue
- Subject Index
- Contents
- Species Index
- Author Index
- Monoethanolamine (MEA) pulping of beech and spruce wood for production of dissolving pulp
- Voltammetric analysis of the bleachability of softwood kraft pulps
- Alkaline degradation of model compounds related to beech xylan
- Effect of UV radiation on the carbonyl distribution in different pulps
- Changes in the lignin-carbohydrate complex in softwood kraft pulp during kraft and oxygen delignification
- Carbohydrate structures in residual lignin-carbohydrate complexes of spruce and pine pulp
- Ozonation of pine kraft lignin in alkaline solution. Part 1: Ozonation, characterization of kraft lignin and its ozonated preparations
- Ozonation of pine kraft lignin in alkaline solution. Part 2: Surface active properties of the ozonated kraft lignins
- Lignin reactions in oxygen delignification catalysed by Mn(II)-substituted molybdovanadophosphate polyanion
- Bioactive phenolic substances in industrially important tree species. Part 2: Knots and stemwood of fir species
- Evaluation of hydrocarbon emissions from heart- and sapwood of Scots pine using a laboratory-scale wood drier
- Effect of pulsating tension-torsion combined loading on fatigue behavior in wood
- Effects of density and microfibril orientation on the vertical variation of low-stiffness wood in radiata pine butt logs
- Determination of the natural durability of larch wood (Larix decidua Mill.) from the Western Italian Alps
- High-performance liquid chromatographic analysis of soluble and total oxalate in Ca- and Mg-amended liquid cultures of three wood decay fungi
- Artificial weathering of tropical woods. Part 1: Changes in wettability and Artificial weathering of tropical woods. Part II: Color change
Articles in the same Issue
- Subject Index
- Contents
- Species Index
- Author Index
- Monoethanolamine (MEA) pulping of beech and spruce wood for production of dissolving pulp
- Voltammetric analysis of the bleachability of softwood kraft pulps
- Alkaline degradation of model compounds related to beech xylan
- Effect of UV radiation on the carbonyl distribution in different pulps
- Changes in the lignin-carbohydrate complex in softwood kraft pulp during kraft and oxygen delignification
- Carbohydrate structures in residual lignin-carbohydrate complexes of spruce and pine pulp
- Ozonation of pine kraft lignin in alkaline solution. Part 1: Ozonation, characterization of kraft lignin and its ozonated preparations
- Ozonation of pine kraft lignin in alkaline solution. Part 2: Surface active properties of the ozonated kraft lignins
- Lignin reactions in oxygen delignification catalysed by Mn(II)-substituted molybdovanadophosphate polyanion
- Bioactive phenolic substances in industrially important tree species. Part 2: Knots and stemwood of fir species
- Evaluation of hydrocarbon emissions from heart- and sapwood of Scots pine using a laboratory-scale wood drier
- Effect of pulsating tension-torsion combined loading on fatigue behavior in wood
- Effects of density and microfibril orientation on the vertical variation of low-stiffness wood in radiata pine butt logs
- Determination of the natural durability of larch wood (Larix decidua Mill.) from the Western Italian Alps
- High-performance liquid chromatographic analysis of soluble and total oxalate in Ca- and Mg-amended liquid cultures of three wood decay fungi
- Artificial weathering of tropical woods. Part 1: Changes in wettability and Artificial weathering of tropical woods. Part II: Color change
