- Original Article
- Published:
Spectral analysis of the successive degradation process of kraft lignin by alkaline oxygen treatment
Journal of Wood Science volume 53, pages 47–53 (2007)
Abstract
Softwood kraft lignin was subjected to alkaline oxygen treatment in a fundamental study of lignin degradation. Two different spectral changes were observed in the time course of ultraviolet-visible spectra along with the progress of the treatment. These spectral changes could be recognized as proceeding along certain temporal functions that were based on second-order decays with different halflives. The spectral changes were defined as “fast change” and “slow change.” The fitting studies on the amount of total protons on the unsaturated and aromatic systems, the amount of unconjugated phenolic substructure determined by differential ionization spectra, and the amount of methoxyl group with temporal functions showed that two reaction types (formation of muconate derivatives and ortho-quinone derivatives) can be expected as the major modification types occurring during fast change. The fitting study of the time course of infrared attenuated total reflectance (ATR) spectra gave corresponding infrared ATR spectral features of fast and slow changes. The occurrence of the formation of muconate derivatives by fast change was strongly supported by the spectral feature of fast change. On the other hand, it is suggested that the aromatic structure of lignin was further degraded during slow change. In addition, formation of resistant phenolic substructures is suggested as another possible modification type occurring by fast change.
References
Olm L, Teder A (1979) The kinetics of oxygen bleaching. TAPPI 62:43–46
Ljunggren S, Johansson E (1990) The kinetics of lignin reactions during oxygen bleaching part 3. Holzforschung 44:291–296
Johansson E, Ljunggren S (1994) The kinetics of lignin reactions during oxygen bleaching part 4. J Wood Chem Technol 14:507–525
Gellerstedt G, Gustafsson K, Lindfors EL (1986) Structural changes in lignin during oxygen bleaching. Nord Pulp Paper Res J 1:14–17
Akim LG, Colodette JL, Argyropoulos DS (2001) Factors limiting oxygen delignification of kraft pulp. Can J Chem 79:201–210
Gierer J, Reitberger T, Yang E, Yoon BH (2001) Formation and involvement of radicals in oxygen delignification studied by the autooxidation of lignin and carbohydrate model compounds. J Wood Chem Technol 21:313–341
Yada M, Shintani H, Meshitsuka G (2005) Infrared spectroscopic study of alkaline oxygen treatment of lignin with ATR technique in aqueous state 1. J Wood Sci 51:239–245
Goto H, Koda K, Tong G, Matsumoto Y, Meshitsuka G (2005) Formation of methyl iodide from methoxyl-free compounds by hydriodic acid treatment. J Wood Sci 51:312–314
Adler E, Marton J, Falkehag I (1964) The behavior of lignin in alkaline pulping 1. Model experiments with phenylcoumarans. Acta Chem Scand 18:1311–1312
Author information
Authors and Affiliations
Corresponding author
Additional information
Parts of this article were presented at the 13th International Symposium on Wood, Fiber, and Pulping Chemistry, Auckland, New Zealand, May 2005
Rights and permissions
About this article
Cite this article
Yada, M., Meshitsuka, G. Spectral analysis of the successive degradation process of kraft lignin by alkaline oxygen treatment. J Wood Sci 53, 47–53 (2007). https://doi.org/10.1007/s10086-006-0822-3
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10086-006-0822-3