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The fate of phosphorus in the bleaching of spruce TMP with the new bleaching agent – THPS

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Published/Copyright: February 28, 2008
Holzforschung
From the journal Volume 62 Issue 4

Abstract

Tetrakis(hydroxymethyl)phosphonium sulfate (THPS) is a newly discovered, phosphorus-based bleaching agent that has been successfully tested in a pulp mill trial. The fate of phosphorus (P) and the chemistry in the course of THPS bleaching of a spruce TMP have been studied. The amount of P introduced into the THPS-bleached pulp depends on THPS dose and the bleaching conditions and it correlates well with the brightness gain. The P introduced into THPS-bleached pulp is covalently bonded to the pulp. The THPS-bleached and tetraethylphosphonium chloride-treated pulps have been additionally treated with calcium chloride before P analysis, and the results of these experiments support the covalent bonding hypothesis. Bleaching with 0.1 and 3.0% THPS (% based on oven-dried pulp) at 60 and 110°C leads to pulps with 0.13 and 2.17 mg P g-1 pulp, respectively, which corresponds to 0.08 and 1.4% THPS. More precisely, P is covalently bonded to lignin chromophores, such as lignin coniferaldehydes. This was found by P-content analysis, UV-visible spectroscopy, and 31P{1H} NMR studies of a crude milled wood lignin (crude MWL) and a partially purified MWL isolated from a THPS-bleached pulp.

Keywords: bleaching; brightness; chromophores; coniferaldehyde; lignins; mechanical pulps; phosphonium compounds: phosphorus; tetrakis(hydroxymethyl) phosphonium sulfate; thermomechanical pulps
Corresponding author. FPInnovations – Paprican Division, Vancouver, British Columbia, Canada V6S 2L9
Received: 2007-11-7
Accepted: 2008-1-29
Published Online: 2008-02-28
Published Online: 2008-02-28
Published in Print: 2008-07-01

©2008 by Walter de Gruyter Berlin New York

Articles in the same Issue

  1. Original Papers
  2. Alkaline-sulfite chemithermomechanical pulping of Eucalyptus grandis biotreated by Ceriporiopsis subvermispora under varied culture conditions
  3. First characterization of the development of bleached kraft softwood pulp fiber interfaces during drying and rewetting using FRET microscopy
  4. The fate of phosphorus in the bleaching of spruce TMP with the new bleaching agent – THPS
  5. Dynamics of the effective capillary cross-sectional area during the alkaline impregnation of eucalyptus wood
  6. Wood solubilization and depolymerization using supercritical methanol. Part 1: Process optimization and analysis of methanol insoluble components (bio-char)
  7. Wood solubilization and depolymerization by supercritical methanol. Part 2: Analysis of methanol soluble compounds
  8. Composition of callus resin of Norway spruce, Scots pine, European larch and Douglas fir
  9. The reduction in the fibre saturation point of wood due to chemical modification using anhydride reagents: A reappraisal
  10. Water absorption thermodynamics in single wood pellets modelled by multivariate near-infrared spectroscopy
  11. A survey of moisture distribution in two sets of Scots pine logs by NIR-spectroscopy
  12. Identification of selected log characteristics from computed tomography images of sugar maple logs using maximum likelihood classifier and textural analysis
  13. Compressive stress-strain properties of natural materials treated with aqueous NaOH
  14. Profile production in multi-veneer sheets by continuous roll forming
  15. Evaluation on structural performance of compressed wood as shear dowel
  16. Wood-adhesive interactions in a PVAc latex
  17. A comprehensive analysis of the relation of cellulose microfibril orientation and lignin content in the S2 layer of different tissue types of spruce wood (Picea abies (L.) Karst.)
  18. Micromorphological characteristics and lignin distribution in bamboo (Phyllostachys pubescens) degraded by the white rot fungus Lentinus edodes
  19. Synthesis of ethylene maleic anhydride copolymer containing fungicides and evaluation of their effect for wood decay resistance
  20. Short Notes
  21. Plasma treatment of heat treated beech wood – investigation on surface free energy
  23. Meetings
https://doi.org/10.1515/HF.2008.066
Keywords for this article
bleaching; brightness; chromophores; coniferaldehyde; lignins; mechanical pulps; phosphonium compounds: phosphorus; tetrakis(hydroxymethyl) phosphonium sulfate; thermomechanical pulps

Articles in the same Issue

  1. Original Papers
  2. Alkaline-sulfite chemithermomechanical pulping of Eucalyptus grandis biotreated by Ceriporiopsis subvermispora under varied culture conditions
  3. First characterization of the development of bleached kraft softwood pulp fiber interfaces during drying and rewetting using FRET microscopy
  4. The fate of phosphorus in the bleaching of spruce TMP with the new bleaching agent – THPS
  5. Dynamics of the effective capillary cross-sectional area during the alkaline impregnation of eucalyptus wood
  6. Wood solubilization and depolymerization using supercritical methanol. Part 1: Process optimization and analysis of methanol insoluble components (bio-char)
  7. Wood solubilization and depolymerization by supercritical methanol. Part 2: Analysis of methanol soluble compounds
  8. Composition of callus resin of Norway spruce, Scots pine, European larch and Douglas fir
  9. The reduction in the fibre saturation point of wood due to chemical modification using anhydride reagents: A reappraisal
  10. Water absorption thermodynamics in single wood pellets modelled by multivariate near-infrared spectroscopy
  11. A survey of moisture distribution in two sets of Scots pine logs by NIR-spectroscopy
  12. Identification of selected log characteristics from computed tomography images of sugar maple logs using maximum likelihood classifier and textural analysis
  13. Compressive stress-strain properties of natural materials treated with aqueous NaOH
  14. Profile production in multi-veneer sheets by continuous roll forming
  15. Evaluation on structural performance of compressed wood as shear dowel
  16. Wood-adhesive interactions in a PVAc latex
  17. A comprehensive analysis of the relation of cellulose microfibril orientation and lignin content in the S2 layer of different tissue types of spruce wood (Picea abies (L.) Karst.)
  18. Micromorphological characteristics and lignin distribution in bamboo (Phyllostachys pubescens) degraded by the white rot fungus Lentinus edodes
  19. Synthesis of ethylene maleic anhydride copolymer containing fungicides and evaluation of their effect for wood decay resistance
  20. Short Notes
  21. Plasma treatment of heat treated beech wood – investigation on surface free energy
  23. Meetings
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