High-consistency ozonation of hardwood kraft pulp
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Ai Van Tran
Abstract
At present, ozone is one of the main chemicals in elemental chlorine-free (ECF) and totally chlorine-free (TCF) bleaching sequences. High consistency (HC) and medium consistency (MC) technologies are in use. This study shows that HC ozonation of hardwood kraft pulp, as expressed by the overall kappa number encompassing both hexenuronic acid groups and residual lignin, is a two-phase path. The reaction rate of the first phase is two- to three-fold higher than that of the second phase. We propose that the first phase is due to ozonation of both hexenuronic acid groups and residual lignin, whereas the second phase involves only residual lignin. The fiber width and wall thickness were relatively unchanged during ozonation. These results are in contrast to the “shrinking core kinetic model” frequently discussed in the context of HC ozonation. The development of pulp brightness and the decrease in pulp viscosity with the ozonation time are well correlated with the overall kappa number or the kappa number due to residual lignin alone.
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©2006 by Walter de Gruyter Berlin New York
Articles in the same Issue
- Contents
- Subject Index
- Species index (scientific names)
- Acknowledgement
- Author index
- Topochemical investigation on phenolic deposits in the vessels of afzelia (Afzelia spp.) and merbau (Intsia spp.) heartwood
- Topochemical investigations of wood extractives and their influence on colour changes in American black cherry (Prunus serotina Borkh.)
- Wound effects in the xylem of poplar: A UV microspectrophotometric study
- Application of scanning UV microspectrophotometry for the topochemical detection of lignin within individual cell walls of brown-rotted Scots pine (Pinus sylvestris L.) sapwood
- Influence of overexpression of a gibberellin 20-oxidase gene on the kinetics of xylem cell development in hybrid poplar (Populus tremula L. and P. tremuloides Michx.)
- Morphological and chemical characterisation of the G-layer in tension wood fibres of Populus tremula and Betula verrucosa: Labelling with cellulose-binding module CBM1HjCel7A and fluorescence and FE-SEM microscopy
- Decay resistance of anhydride-modified Corsican pine sapwood exposed to the brown rot fungus Coniophora puteana
- Iron-reducing capacity of low-molecular-weight compounds produced in wood by fungi
- Analysis of the hyphal load during early stages of wood decay by basidiomycetes in the presence of the wood preservative fungicides CuSO4 and cyproconazole
- Prediction of natural durability of commercial available European and Siberian larch by near-infrared spectroscopy
- Retention of Bacillus cereus and its toxin, cereulide, in cellulosic fibres
- Chemical structure elucidation of total lignins in woods. Part II: Analysis of a fraction of residual wood left after MWL isolation and solubilized in lithium chloride/N,N-dimethylacetamide
- Amphiphilicity of a lignin-carbohydrate complex
- Spatial relationships between polymers in Sitka spruce: Proton spin-diffusion studies
- Phenolic compounds from bark of Suwon poplar (Populus alba L. and Populus glandulosa Uyeki)
- Extraction of iron compounds from wood from the Vasa
- High-consistency ozonation of hardwood kraft pulp
- Fibre surface and strength of a fibre network
- A numerical study of the effects of stresses induced by moisture gradients in steel-timber dowel joints
- Pilot investigation of the mechanical properties of wood flooring paint films by in situ imaging nanoindentation
- Obituary Walter G. Kauman (1923–2005)
Articles in the same Issue
- Contents
- Subject Index
- Species index (scientific names)
- Acknowledgement
- Author index
- Topochemical investigation on phenolic deposits in the vessels of afzelia (Afzelia spp.) and merbau (Intsia spp.) heartwood
- Topochemical investigations of wood extractives and their influence on colour changes in American black cherry (Prunus serotina Borkh.)
- Wound effects in the xylem of poplar: A UV microspectrophotometric study
- Application of scanning UV microspectrophotometry for the topochemical detection of lignin within individual cell walls of brown-rotted Scots pine (Pinus sylvestris L.) sapwood
- Influence of overexpression of a gibberellin 20-oxidase gene on the kinetics of xylem cell development in hybrid poplar (Populus tremula L. and P. tremuloides Michx.)
- Morphological and chemical characterisation of the G-layer in tension wood fibres of Populus tremula and Betula verrucosa: Labelling with cellulose-binding module CBM1HjCel7A and fluorescence and FE-SEM microscopy
- Decay resistance of anhydride-modified Corsican pine sapwood exposed to the brown rot fungus Coniophora puteana
- Iron-reducing capacity of low-molecular-weight compounds produced in wood by fungi
- Analysis of the hyphal load during early stages of wood decay by basidiomycetes in the presence of the wood preservative fungicides CuSO4 and cyproconazole
- Prediction of natural durability of commercial available European and Siberian larch by near-infrared spectroscopy
- Retention of Bacillus cereus and its toxin, cereulide, in cellulosic fibres
- Chemical structure elucidation of total lignins in woods. Part II: Analysis of a fraction of residual wood left after MWL isolation and solubilized in lithium chloride/N,N-dimethylacetamide
- Amphiphilicity of a lignin-carbohydrate complex
- Spatial relationships between polymers in Sitka spruce: Proton spin-diffusion studies
- Phenolic compounds from bark of Suwon poplar (Populus alba L. and Populus glandulosa Uyeki)
- Extraction of iron compounds from wood from the Vasa
- High-consistency ozonation of hardwood kraft pulp
- Fibre surface and strength of a fibre network
- A numerical study of the effects of stresses induced by moisture gradients in steel-timber dowel joints
- Pilot investigation of the mechanical properties of wood flooring paint films by in situ imaging nanoindentation
- Obituary Walter G. Kauman (1923–2005)
