Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Oxidation of residual lignin with alkaline hydrogen peroxide. Part II: Elimination of chromophoric groups
Autore:
Gartner, A; Gellerstedt, G;
Indirizzi:
Royal Inst Technol, Dept Pulp Paper Chem & Tech, SE-10044 Stockholm, Sweden Royal Inst Technol Stockholm Sweden SE-10044 SE-10044 Stockholm, Sweden
Titolo Testata:
JOURNAL OF PULP AND PAPER SCIENCE
fascicolo: 7, volume: 27, anno: 2001,
pagine: 244 - 248
SICI:
0826-6220(200107)27:7<244:OORLWA>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Keywords:
oxidation; lignins; hydrogen peroxide; kraft pulps; bleached pulps; oxygen bleaching; transition metals; ions; stabilizers; temperature; reaction time; chromophores;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
9
Recensione:
Indirizzi per estratti:
Indirizzo: Gartner, A Royal Inst Technol, Dept Pulp Paper Chem & Tech, SE-10044 Stockholm, Sweden Royal Inst Technol Stockholm Sweden SE-10044 tockholm, Sweden
Citazione:
A. Gartner e G. Gellerstedt, "Oxidation of residual lignin with alkaline hydrogen peroxide. Part II: Elimination of chromophoric groups", J PULP PAP, 27(7), 2001, pp. 244-248

Abstract

Isolated residual lignin from art oxygen-bleached kraft pulp was subjectedto oxidation with alkaline hydrogen peroxide under different time and temperature conditions in both the absence and presence of stabilizing agents and transition metal ions. The resulting lignin samples were analyzed by UV/VIS and FTIR spectroscopy. The analyses demonstrate the occurrence at a temperature as low as 50 degreesC: of a rapid but limited elimination of chromophoric groups, resulting in the formation of carboxyl groups. The presenceof DTPA and magnesium ions stabilizes the hydrogen peroxide towards decomposition and the chromophore elimination is improved. At a higher oxidation temperature, 80 degreesC, the effect of added stabilizer(s) is particularlypronounced. Addition of transition metal ions resulted in a rapid decomposition of hydrogen peroxide and the introduction of new chromophoric groups.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/11/20 alle ore 14:06:29