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The Effects of the Order of Chemical Addition on the Peroxide Bleaching of an Oxygen-Delignified Softwood Kraft Pulp

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Published/Copyright: June 1, 2005
Holzforschung
From the journal Volume 54 Issue 3

Summary

In pulp bleaching, while the peroxide-stage chemical charges and the physical operating conditions have been optimized, little attention has been given to the order in which these chemicals are added. We assessed the effects of chemicals, individually and combined, and the effects of the order of addition of these chemicals on peroxide bleaching performance in an acid-treated pulp and in a chelated pulp. We found that adding magnesium to an acid-treated pulp is essential for good peroxide bleaching, while adding magnesium to a chelated pulp provides only a marginal improvement in most additions. But adding magnesium and sodium hydroxide, or sodium hydroxide and magnesium sequentially into a bleaching solution before adding the solution into pulp, causes inefficient peroxide bleaching. This is particularly the case with a chelated pulp. This inefficiency can be avoided if a chelant is added between the additions of magnesium and sodium hydroxide. Magnesium is substantially more effective when in a complex form with either the pulp or a chelant, and the optimum concentration of magnesium for use in peroxide bleaching can be determined by following the peroxide residual.

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Published Online: 2005-06-01
Published in Print: 2000-04-13

Copyright © 2000 by Walter de Gruyter GmbH & Co. KG

Articles in the same Issue

  1. Molecular Methods for the Characterization and Identification of the Dry Rot Fungus Serpula lacrymans
  2. Use of Soft Rot Fungi for Studies on the Microstructure of Kapok (Ceiba pentandra (L.) Gaertn.) Fibre Cell Walls
  3. Ultrastructural Changes in the Compound Middle Lamella of Pinus thunbergii During Lignification and Lignin Removal
  4. Comparison of the Antifungal Activity of Cadinane Skeletal Sesquiterpenoids from Taiwania (Taiwania cryptomerioides Hayata) Heartwood
  5. Characterization of the Polyphenolics Related to the Colour of Western Red Cedar (Thuja plicata Donn) Heartwood
  6. Influence of Botanical Species and Geographical Origin on the Content of Low Molecular Weight Phenolic Compounds of Woods Used in Portuguese Cooperage
  7. Effect of Oxygen Pressure on the Oxidation of Syringyl Alcohol Initiated by Manganese(III) Acetate
  8. Potential Catalysts for the Acetylation of Wood
  9. Quantification of Muconic Acid-Type Structures in High Molecular Weight Material from Bleach Plant Effluents
  10. The Effects of the Order of Chemical Addition on the Peroxide Bleaching of an Oxygen-Delignified Softwood Kraft Pulp
  11. Effects of Thermo-Hydro-Mechanical Treatment on the Structure and Properties of Wood
  12. Improvement of Heartwood Color of Black-Colored Sugi (Cryptomeria japonica D. Don) by UV Irradiation after Smoke Heating
  13. Analysis of the Wood Sorption Isotherm Using the Theory of Micropore Volume Filling
  14. Acoustic Emission Generated upon Mechano-Sorptive Creep of Wood Bent Across to the Grain under Asymmetrical Moistening
  15. Experimental Data Correction of the Dynamic Elastic Moduli, Velocity and Density of Solid Wood as a Function of Moisture Content above the Fiber Saturation Point
  16. Contractive Force and Transformation of Microfibril with Aqueous Sodium Hydroxide Solution for Wood
  17. Dielectric Relaxation Based on Adsorbed Water in Wood Cell Wall under Non-Equilibrium State. 1
  18. Stabilizing Effect of Chromated Salt Treatment on the Green Color of Ma Bamboo (Dendrocalamus latiflorus)
  19. Microwave-Enhanced Transport of Chemicals into Green Wood under Low-Headspace Conditions
  20. Personalia: Günther Stegmann in memoriam
https://doi.org/10.1515/HF.2000.047

Articles in the same Issue

  1. Molecular Methods for the Characterization and Identification of the Dry Rot Fungus Serpula lacrymans
  2. Use of Soft Rot Fungi for Studies on the Microstructure of Kapok (Ceiba pentandra (L.) Gaertn.) Fibre Cell Walls
  3. Ultrastructural Changes in the Compound Middle Lamella of Pinus thunbergii During Lignification and Lignin Removal
  4. Comparison of the Antifungal Activity of Cadinane Skeletal Sesquiterpenoids from Taiwania (Taiwania cryptomerioides Hayata) Heartwood
  5. Characterization of the Polyphenolics Related to the Colour of Western Red Cedar (Thuja plicata Donn) Heartwood
  6. Influence of Botanical Species and Geographical Origin on the Content of Low Molecular Weight Phenolic Compounds of Woods Used in Portuguese Cooperage
  7. Effect of Oxygen Pressure on the Oxidation of Syringyl Alcohol Initiated by Manganese(III) Acetate
  8. Potential Catalysts for the Acetylation of Wood
  9. Quantification of Muconic Acid-Type Structures in High Molecular Weight Material from Bleach Plant Effluents
  10. The Effects of the Order of Chemical Addition on the Peroxide Bleaching of an Oxygen-Delignified Softwood Kraft Pulp
  11. Effects of Thermo-Hydro-Mechanical Treatment on the Structure and Properties of Wood
  12. Improvement of Heartwood Color of Black-Colored Sugi (Cryptomeria japonica D. Don) by UV Irradiation after Smoke Heating
  13. Analysis of the Wood Sorption Isotherm Using the Theory of Micropore Volume Filling
  14. Acoustic Emission Generated upon Mechano-Sorptive Creep of Wood Bent Across to the Grain under Asymmetrical Moistening
  15. Experimental Data Correction of the Dynamic Elastic Moduli, Velocity and Density of Solid Wood as a Function of Moisture Content above the Fiber Saturation Point
  16. Contractive Force and Transformation of Microfibril with Aqueous Sodium Hydroxide Solution for Wood
  17. Dielectric Relaxation Based on Adsorbed Water in Wood Cell Wall under Non-Equilibrium State. 1
  18. Stabilizing Effect of Chromated Salt Treatment on the Green Color of Ma Bamboo (Dendrocalamus latiflorus)
  19. Microwave-Enhanced Transport of Chemicals into Green Wood under Low-Headspace Conditions
  20. Personalia: Günther Stegmann in memoriam
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