Characterization of Photo-Yellowing Trigger Compounds Repressing Paper Recyclability of Eucalyptus globulus by Pyrolysis-GC/MS
Aucalyptus is a widely utilized species in tree plantation, especially intended for pulp production . E. globulus is one of the fast growing species in tempertae zone with a rotation period of 8–10 years . We have reported that chemithermomechanical pulp (CTMP) paper prepared from several individuals of E. globulus showed high brightness (about 70% ISO) with more than 85% pulp yield . To construct an effective carbon loop, higher paper recycling rate is preferable. The degree of photo-yellowing is crucial for recycling in CTMP paper because it determines requirement amount of bleaching agents. The photo-yellowing mechanism is proposed in which the photochemical reaction of lignin in pulp may lead to the formation of quinone species via intermediates of phenoxy radicals, which are produced through photoexcitation of the carbonyl groups involved in lignin (Scheme 1) .
KeywordsMethoxyl Group Eucalyptus Globulus Phenoxy Radical Bleaching Agent Pulp Production
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- Fao. Fao Forestry Series 11 (1981) 304.Google Scholar
- Kojima, Y., Isaji, S., Yoon, S. L. and Ona, T., 11th ISWPC, Nice, France, June 11–14, 2001; Vol. 11, 215.Google Scholar
- Gierer, J. and Lin, S. Y. Sven. Papperstidn. 75 (1972) 233.Google Scholar
- Hon, D. N. S. and Chang, S. T. J. Poly. Sci. 22 (1984) 2227.Google Scholar
- Hon, D. N. S., Clemson, S. C. and Feist, W. C. Wood Sci. Tech. 20 (1986) 169.Google Scholar
- Del Río, J. C, Iérrez, A., Romero, J., Martínez, M. J. and Martínez, A. T. J. Anal. Appl. Pyrolysis 58–59 (2001) 425.Google Scholar
- Yoshioka, A., Takai, M., Kojima, Y, Seino, T., Ishikura, Y, Sonoda, T., Ona, T., Goto, K., Yokoi, H., Ishida, Y, Ohtani, H. and Tsuge, S. Pyrolysis 2002, Leoben, Austria, September 17–20 (2002) 129.Google Scholar
- Leary, G. J. Tappi J. 50 (1967) 17.Google Scholar