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Titolo:
RADICAL FORMATION IN PEROXIDE-BLEACHED KRAFT PULP
Autore:
GRONROOS AJ; PITKANEN M; VUOLLE M;
Indirizzi:
UNIV JYVASKYLA,DEPT CHEM,POB 35 FIN-40351 JYVASKYLA FINLAND METSA SERLA OY FIN-44101 AANEKOSKI FINLAND
Titolo Testata:
Journal of pulp and paper science
fascicolo: 9, volume: 24, anno: 1998,
pagine: 286 - 290
SICI:
0826-6220(1998)24:9<286:RFIPKP>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
ALKALINE;
Keywords:
KRAFT PULPS; BLEACHED PULPS; PEROXIDE BLEACHING; RADICALS; ELECTRON SPIN RESONANCE; ULTRAVIOLET RESISTANCE; HEATING; HEAVY METALS; LIGNIN CONTENT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
18
Recensione:
Indirizzi per estratti:
Citazione:
A.J. Gronroos et al., "RADICAL FORMATION IN PEROXIDE-BLEACHED KRAFT PULP", Journal of pulp and paper science, 24(9), 1998, pp. 286-290

Abstract

The stability of hydrogen peroxide bleached kraft pulp against radical formation under different conditions was studied by the electron paramagnetic resonance (EPR) technique. Among the conditions investigatedwere darkness and light, healing at elevated temperatures and UV radiation. In addition, the effects of Fe and Mg ions and lignin content on relative radical concentrations were examined. Samples which represented commercial softwood and hardwood pulps were taken from the pulping process before final acidification and drying. All EPR spectra were measured at room temperature and consisted of a single line with line width of about 0.8 mT. The middle point of the peak corresponds to theg value 2.004-2.005. The relative radical concentration was found to increase least on storing in the dark and most On exposure to UV radiation. The relative radical concentration seemed to increase in two phases: a faster initial increase and then a slower reaction. The observed photochromic effect showed a similar two-phase reaction.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 04:44:11