DELIGNIFICATION OF EUCALYPT WOOD (EUCALYPTUS-GLOBULUS) IN ACETIC-ACID WATER MEDIA - EFFECT OF PRESSURIZED OXYGEN ADDITION
authors NETO, CP; ROBERT, A
journal HOLZFORSCHUNG
author keywords DELIGNIFICATION; SOLVOLYSIS; ACETIC ACID WATER; OXYGEN; ACID HYDROLYSIS; EUCALYPTUS-GLOBULUS
keywords BEHAVIOR; ETHERS; LIGNIN
abstract The delignification of E. globulus wood by acetic acid/water solutions (80:20, VN) has been studied at 140-150-degrees-C, without the presence of any catalyst (autocatalyzed solvolysis). A degree of delignification of 90% can be obtained with a pulp yield of 50%, but with cooking times relatively high; lignin condensation and reprecipitation is observed if cooking is extended. In the presence of oxygen (15 bar at 25-degrees-C) (oxydative solvolysis), a net increase in reaction kinetics is observed and the degree of delignification is higher. Pulp yields always exceed 50% but cellulose DPv are relatively small as a consequence of fiber degradation in the presence of oxygen. The chemistry of solvent pulping, with or without oxygen is discussed.
publisher WALTER DE GRUYTER & CO
issn 0018-3830
year published 1992
volume 46
issue 3
beginning page 233
ending page 240
web of science category Forestry; Materials Science, Paper & Wood
subject category Forestry; Materials Science
unique article identifier WOS:A1992JA00300010
  ciceco authors
  impact metrics
journal analysis (jcr 2019):
journal impact factor 1.826
5 year journal impact factor 1.828
category normalized journal impact factor percentile 74.387
altmetrics (social interaction):



 


Sponsors

1suponsers_list_ciceco.jpg