Chemical Composition of Spent Liquors from Acidic Magnesium-Based Sulphite Pulping of Eucalyptus globulus
authors Marques, AP; Evtuguin, DV; Magina, S; Amado, FML; Prates, A
nationality International
journal JOURNAL OF WOOD CHEMISTRY AND TECHNOLOGY
author keywords Chemical composition; Eucalyptus globulus; lignosulphonates; sulphite pulping; sulphite spent liquor
keywords LIGNIN; WOOD
abstract The major components of industrial thin (SSL) and thick (THSL) liquors from acidic magnesium-based sulphite pulping of Eucalyptus globulus wood have been characterized. The analysis of sugars in SSL revealed the predominance of xylose, which was present in the form of sugar monomer (ca. 70%) and as xylo-oligosaccharides (ca. 30%). Lignosulphonates (LS) were the most abundant organic fraction of spent liquor (ca. 50% of liquor dry matter) consisting of sulphonated oligomers (SO3H approximate to 20% w/w) of low molecular weight (Mw approximate to 1000-1300 Da) and constituted mainly by syringyl units (syringyl:guaiacyl ratio = 81:19). The major phenolic extractives of THSL were pyrogallol (93 g/ton) and gallic acid (1020 g/ton), and the most abundant fatty acid and sterol were tetracosanoic acid (6 g/ton) and -sitosterol (45 g/ton), respectively. The structural changes of macromolecular components during the liquor evaporation were discussed.
publisher TAYLOR & FRANCIS INC
issn 0277-3813
year published 2009
volume 29
issue 4
beginning page 322
ending page 336
digital object identifier (doi) 10.1080/02773810903207754
web of science category Materials Science, Paper & Wood
subject category Materials Science
unique article identifier WOS:000274364200005
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journal impact factor 1.899
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