Characterization of Residual Lignins Isolated from Unbleached and Semibleached Softwood Kraft Pulps
- 1 January 1987
- journal article
- research article
- Published by Taylor & Francis in Journal of Wood Chemistry and Technology
- Vol. 7 (1) , 81-96
- https://doi.org/10.1080/02773818708085254
Abstract
Residual lignins in an unbleached and a semibleached softwood (Pinus taeda L.) kraft pulp were isolated by enzymatic hydrolysis of polysaccharides in the pulps. After purification, the residual lignins were characterized. A dissolved lignin was also isolated from the alkaline extraction spent liquor by acidification and characterized. Results of the characterization indicate that extensive degradation of residual lignin in kraft pulp occurred during the first two stages of bleaching. The results also strongly support the previous finding that stable covalent linkages between residual lignins and carbohydrates in pulp any be the most probable cause for the residual lignins to resist delignification during kraft pulping and prebleaching.Keywords
This publication has 8 references indexed in Scilit:
- Chemical Linkage of Polysaccharides to Residual Lignin in Loblolly Pine Kraft PulpsJournal of Wood Chemistry and Technology, 1986
- Lignin-Carbohydrate Bonds in a Residual Lignin Isolated from Pine Kraft PulpHolzforschung, 1986
- Structural Changes in Lignin During Kraft PulpingHolzforschung, 1984
- Formation of Alkali-Stahle C-C-Bonds Between Lignin and Carbohydrate Fragments During Kraft PulpingHolzforschung, 1984
- Chemical Linkage of Pine Polysaccharides to LigninJournal of Wood Chemistry and Technology, 1982
- Structural studies on the chemical bonds between lignins and carbohydrates in spruce woodWood Science and Technology, 1980
- Modelle für die Bindung des Lignins an die KohlenhydrateEuropean Journal of Inorganic Chemistry, 1960
- Beitrag zum Bildungsmechanismus des Lignins und der Lignin‐Kohlenhydrat‐BindungEuropean Journal of Inorganic Chemistry, 1959