Changes on Fiber Surface During Prebleaching Comparing, Different Chlorine-Free Delignification Agents
Keywords:Selective staining, ESCA measurements, charge determinations, prebleaching, ozone, peroxide
AbstractThree methods for surface characteristics of fibers were used (selective staining of fibers, ESCA measurements, and charge determination) to follow the delignification process during prebleaching with ozone and peroxide. The results of each method were evaluated with respect to the particular action of each agent. The method of selective staining with cationic dyes offers us a simple way to characterize the reactivity of fiber surface covered with lignin. The catatonic dyes' absorbancies are in correlation with the amount of active sites that belong to lignin (mostly phenolic groups), representing the differences between the course of delignification caused by either ozone or peroxide.
Adler, E. 1977. Lignin chemistry—Past, present and future. Wood Sci. Technol. 11:169-218.nAnnergren, G. M. Boman, and P. Sandstrom. 1998. Principles of multi-stage bleaching of softwood kraft pulp. Int. Pulp Bleaching Conf., Helsinki, Finland. 1:99-110.nBrowning, B. L. 1967. Methods of wood chemistry, Vol. II, Interscience, New York, NY. 445 pp.ndeBelder, A. N., B. Linberg, and O. Theander. 1963. The oxidation of glycosides XIII. The oxidation of methyl β-D-g1 ucopyranoside with Fenton's reagent. Acta Chem. Scand. 17:1012-1014.nDrnovšek, T. and A. Perdih. 2000. Surface characteristics of Cl-free prebleached fibers. Int. Pulp Bleaching Conf., Halifax, Canada. 11:181-184.nDrnovšek, T. and A. Perdih. 2001. Specific staining as a tool for fiber characterization. Research techniques for tomorrow's papermaking, Hanasaari, Espoo, Finland, COST E 11 Final Workshop. Pp. 49-56.nEckert, R. C., H.-M, Chang, and W. P. Tucker. 1973. Oxydative degradation of phenolic lignin model compounds with oxygen and alkali. Tappi 56(6):134-138.nGellerstedt, G., and R. Agnemo. 1980. The reactions of lignin with alkaline hydrogen peroxide. Part III. The oxdation of conjugated carbonyl structures. Acta Chem. Scand. B34:275-280.nGellerstedt, G., and J. Li. 1996. An HPLC method for the quantitative determination of hexeneuronic acid groups in chemical pulps. Carbohydrate Res. 294:41-51.nGierer, J. 1990. Basic principles of bleaching. Holzforschung. 44 (5):387-394.nGierer, J., and F. Imsgard. 1977. The reactions of lignins with oxygen and hydrogen peroxide in alkaline media. Sven. Paperstidn. 80:510-518.nHuisgen, R. 1963. 1,3-Dipolar Cycloadditions, Past and future. Angew. Chem. Internat. Edit. 2(10):565-598.nJohansson, L.-S, J. M, Campbell, K. Koljonen, and P. Stenius. 1999. Evaluation of surface lignin on cellulose fibers with XPS. Appl. Surface Sci. 144-145:92-95.nLaine J., J. Buchert, L. Viikari, and P. Stenius. 1996. Characterization of unbleached kraft pulps by enzymatic treatment, potentiometric titration and polyelectrolyte adsorption. Holzforschung 50:208-214.nLi, J., and G. Gellerstedt. 1998. Nord. Pulp Pap. Res. J. 13:153-158.nWagberg, L., L. Ödberg, and G. Glad-Nordmark. 1989. Nord. Pulp Pap. Res. J. 4:187-191.n
The copyright of an article published in Wood and Fiber Science is transferred to the Society of Wood Science and Technology (for U. S. Government employees: to the extent transferable), effective if and when the article is accepted for publication. This transfer grants the Society of Wood Science and Technology permission to republish all or any part of the article in any form, e.g., reprints for sale, microfiche, proceedings, etc. However, the authors reserve the following as set forth in the Copyright Law:
1. All proprietary rights other than copyright, such as patent rights.
2. The right to grant or refuse permission to third parties to republish all or part of the article or translations thereof. In the case of whole articles, such third parties must obtain Society of Wood Science and Technology written permission as well. However, the Society may grant rights with respect to Journal issues as a whole.
3. The right to use all or part of this article in future works of their own, such as lectures, press releases, reviews, text books, or reprint books.