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Fundamental Physical Aspects on Lignin Dissolution

Authors
  • Norgren, Magnus
  • Edlund, Håkan
  • Wågberg, Lars
  • Annergren, Göran
Publication Date
Jan 01, 2002
Identifiers
DOI: 10.3183/NPPRJ-2002-17-04-p370-373
OAI: oai:DiVA.org:miun-1855
Source
DiVA - Academic Archive On-line
Keywords
Language
English
License
Green
External links

Abstract

The aggregation of diluted kraft lignin (KL) solutions was studied by turbidity measurements at elevated temperatures, various sodium chloride and sodium hydroxide concentrations. Since adsorptive processes usually precede self-aggregation in macromolecular systems as the solution conditions get worse, the interaction between KL and pulp fibres was also investigated. When treating samples of fully bleached softwood pulp fibres in KL solutions under various solution conditions, the light-absorption coefficient increased and the brightness was found to decrease rapidly above pOH 1, as the temperature was elevated. At pOH 2 and 175°C, the adsorption of KL was up to about 6 mg g-1. The results are also discussed theoretically in terms of lignin solubility and lignin coagulation.

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