THE INFLUENCE OF PULPING CONDITIONS ON THE STRUCTURE OF ACETOSOLV EUCALYPTUS LIGNINS

Authors
VAZQUEZ G ANTORRENA G GONZALEZ J FREIRE S
Citation
G. Vazquez et al., THE INFLUENCE OF PULPING CONDITIONS ON THE STRUCTURE OF ACETOSOLV EUCALYPTUS LIGNINS, Journal of wood chemistry and technology, 17(1-2), 1997, pp. 147-162
Citations number
19
Categorie Soggetti
Materials Science, Paper & Wood
Journal title
Journal of wood chemistry and technology → ACNP
ISSN journal
02773813
Volume
17
Issue
1-2
Year of publication
1997
Pages
147 - 162
Database
ISI
SICI code
0277-3813(1997)17:1-2<147:TIOPCO>2.0.ZU;2-O
Abstract
Acetosolv lignins obtained under a variety of pulping conditions as re gards acetic acid concentration, catalyst concentration, temperature a nd pulping time were characterized structurally by elemental analysis, FTIR and H-1 and C-13 NMR spectroscopy, and determination of methoxyl group content. Increasing catalyst concentration and pulping time fav ours both the dissolution of lignin (by cleavage of alpha and beta-O-4 bonds) and the occurrence of condensation reactions. Increasing tempe rature favours the degradation of syringyl units more than of guaiacyl units.