DELIGNIFICATION OF EUCALYPTUS-GLOBULUS WOOD BY ETHANOL WATER SOLUTIONS IN BATCH AND FLOW-THROUGH-REACTOR - EFFECT OF PRESSURIZED OXYGEN ADDITION
authors NETO, CP; ROBERT, A
journal HOLZFORSCHUNG
author keywords DELIGNIFICATION; SOLVOLYSIS; ETHANOL WATER PULPING; OXYGEN; BATCH COOKING; FLOW-THROUGH-REACTOR; EUCALYPTUS-GLOBULUS
keywords PULP PROPERTIES; KINETICS
abstract We have studied the delignification of E. globulus wood by water-ethanol mixtures (50:50, V/V) at 160-degrees-C, without any chemical additive. In the absence of oxygen, the best results were obtained by percolation of liquor in flow-through-reactor or with higher liquor-to-wood ratios (> 10) in batch cookings; but delignification is always limited. In the presence of oxygen under pressure (15 bar at 25-degrees-C), a net increase was observed in both the reaction kinetics and degree of delignification. For well delignified pulps, the yields remain satisfactory; nevertheless, DPBAR values were low as a consequence of the fiber degradation by oxygen. The mechanisms of delignification are discussed and reaction pathways are proposed.
publisher WALTER DE GRUYTER & CO
issn 0018-3830
year published 1992
volume 46
issue 1
beginning page 69
ending page 76
web of science category Forestry; Materials Science, Paper & Wood
subject category Forestry; Materials Science
unique article identifier WOS:A1992HJ21900011
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journal analysis (jcr 2019):
journal impact factor 1.826
5 year journal impact factor 1.828
category normalized journal impact factor percentile 74.387
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