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Titolo:
Influence of oxidized lignin structures from chlorine dioxide delignified pulps on the kappa number test
Autore:
Brogdon, BN;
Indirizzi:
Vinings Ind Inc, Marietta, GA 30060 USA Vinings Ind Inc Marietta GA USA 30060 ngs Ind Inc, Marietta, GA 30060 USA
Titolo Testata:
JOURNAL OF PULP AND PAPER SCIENCE
fascicolo: 11, volume: 27, anno: 2001,
pagine: 364 - 369
SICI:
0826-6220(200111)27:11<364:IOOLSF>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
RESIDUAL KRAFT LIGNIN;
Keywords:
bleaching; chlorine dioxide; bleached pulps; kraft pulps; lignins; oxidation; kappa number; ratios; quinones;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Brogdon, BN Vinings Ind Inc, 1525 Church St Ext, Marietta, GA 30060 USA Vinings Ind Inc 1525 Church St Ext Marietta GA USA 30060 0 USA
Citazione:
B.N. Brogdon, "Influence of oxidized lignin structures from chlorine dioxide delignified pulps on the kappa number test", J PULP PAP, 27(11), 2001, pp. 364-369

Abstract

Chlorine dioxide delignification (D-o) of kraft pulps caused the lignin/kappa number ratio to increase from 0.15 to 0.18. It was speculated that oxidized structures in the D-o residual lignin, such as quinones, consumed lesspermanganate than unbleached residual lignin. Kraft pulps oxidized with periodate, a method known to produce quinone structures, also showed an increase in the lignin/kappa ratio from 0.15 to 0.18. Results from model compound studies indicated that quinones consumed similar to 25 to 40% less permanganate than corresponding phenolic or dihydroxybenzene models. Hydrosulphite reductions of periodate and D-o pulps caused the lignin/kappa ratio to return to 0.15. Additional studies indicated that muconic structures in D-o residual lignin do not affect the lignin/kappa ratio. Based on these findings, it was estimated that the D-o residual lignin contained similar to1.9 mmol quinones/g lignin.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 07:36:48