Effect of oxygen, ozone and hydrogen peroxide bleaching stages on the contents and composition of extractives of Eucalyptus globulus kraft pulps
authors Freire, CSR; Silvestre, AJD; Neto, CP; Evtuguin, DV
nationality International
journal BIORESOURCE TECHNOLOGY
author keywords Eucalyptus globulus; lipophilic extractives; TCF bleaching; GC-MS analysis
keywords LIPOPHILIC EXTRACTIVES; PITCH DEPOSITS; WOOD; MILL
abstract The effects of oxygen (O), ozone (Z) and hydrogen peroxide (P) bleaching stages on the composition and total amount of Eucalyptus globulus kraft pulp lipophilic extractives was studied. These bleaching stages led to the partial removal and to several oxidative transformations of fatty acids and sterols, the main lipophilic extractives found in the unbleached pulp. Unsaturated extractives were found to be partially degraded while saturated ones were, in general, stable. The oxygen and hydrogen peroxide bleaching stages were more effective than ozone in removing fatty acids from pulp, by dissolution in the liquid phase. On the other hand, the ozone stage was more effective in the oxidative degradation of sterols. Oxygen and hydrogen peroxide bleaching stages were also effective in sterols removal, but led to the formation of sterol oxidation derivatives, previously shown to be involved in the formation of pitch that accumulates in the bleaching filtrates. (c) 2005 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0960-8524
year published 2006
volume 97
issue 3
beginning page 420
ending page 428
digital object identifier (doi) 10.1016/j.biortech.2005.03.006
web of science category Agricultural Engineering; Biotechnology & Applied Microbiology; Energy & Fuels
subject category Agriculture; Biotechnology & Applied Microbiology; Energy & Fuels
unique article identifier WOS:000234152800011
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journal analysis (jcr 2019):
journal impact factor 7.539
5 year journal impact factor 7.27
category normalized journal impact factor percentile 92.54
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