DELIGNIFICATION AND BRIGHTENING OF EUCALYPT KRAFT PULP WITH HYDROGEN-PEROXIDE AND UV-RADIATION

Authors
ABBOT J SUN YP
Citation
J. Abbot et Yp. Sun, DELIGNIFICATION AND BRIGHTENING OF EUCALYPT KRAFT PULP WITH HYDROGEN-PEROXIDE AND UV-RADIATION, Appita journal, 46(3), 1993, pp. 198-202
Citations number
NO
Categorie Soggetti
Materials Science, Paper & Wood
Journal title
Appita journal → ACNP
ISSN journal
10386807
Volume
46
Issue
3
Year of publication
1993
Pages
198 - 202
Database
ISI
SICI code
1038-6807(1993)46:3<198:DABOEK>2.0.ZU;2-Y
Abstract
Under relatively mild conditions (1% concentration, 32-degrees-C), alk aline hydrogen peroxide delignification and brightening of eucalypt kr aft pulp were significantly enhanced by UV irradiation at 254 nm. The pulp was bleached to 81% ISO with 2% peroxide after 10 hours irradiati on. Hydroxyl radicals appear to be the principal active species in the UV/peroxide system. Zero span tensile strength and crystallinity inde x measurements indicate that fibre damage is not appreciable under the se bleaching conditions.