Lipophilic extractives in Eucalyptus globulus kraft pulps. Behavior during ECF bleaching
authors Freire, CSR; Silvestre, AJD; Neto, CP
nationality International
journal JOURNAL OF WOOD CHEMISTRY AND TECHNOLOGY
author keywords Eucalyptus kraft pulp; ECF bleaching; lipophilic extractives; sterols; fatty acids; long-chain aliphatic alcohols; beta-sitosterol
keywords CHLORINATED COMPOUNDS; PITCH DEPOSITS; CHEMICAL-COMPOSITION; WOOD EXTRACTIVES; MILL; TCF; GLUCURONOXYLAN; COMPONENTS; AOX
abstract The composition of E. globulus kraft pulp lipophilic extractives and their behaviour during an ECF (DEDED) bleaching sequence were investigated. Sterols; fatty acids, including several alpha- and omega-hydroxyfatty acids; and long-chain aliphatic alcohols are the major lipophilic extractives of the unbleached pulp. During the bleaching, about 80% of the aliphatic extractives are removed from pulp (ca. 70% of the sterols, 70% of the fatty acids, and 90% of the long-chain aliphatic alcohols). The decrease of sterols is mainly due to the degradation of beta-sitosterol by chlorine dioxide, while the decrease of fatty acids and alcohols is essentially assigned to their extraction and elimination with the alkaline filtrates. The major chemical transformations in pulp extractives composition and structure occur in the last bleaching stages.
publisher TAYLOR & FRANCIS INC
issn 0277-3813
year published 2005
volume 25
issue 1-2
beginning page 67
ending page 80
digital object identifier (doi) 10.1081/WCT-200058241
web of science category Materials Science, Paper & Wood
subject category Materials Science
unique article identifier WOS:000229998600006
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journal impact factor 1.899
5 year journal impact factor 2.033
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