Structure of Lignosulphonates 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 Eucalyptus globulus; ESI-MS; NMR; lignosulphonates; structure; sulphite pulping; sulphite spent liquor
keywords MASS-SPECTROMETRY; FINE CHEMICALS; LIGNIN; VANILLIN; BEHAVIOR
abstract The structure of lignosulphonates (LS) from acidic magnesium-based sulphite pulping of Eucalyptus globulus wood has been studied. LS from thin and thick spent liquors were purified by dialysis and characterised by 1D/2D Nuclear Magnetic Resonance (NMR) and Electrospray Ionization Mass Spectrometry (ESI-MS). It was suggested that major part of LS is comprised of partially sulphonated low molecular weight oligomers formed via extensive cleavage of -O-4 bonds in eucalypt lignin upon sulphite pulping. More than ten types of LS structures derived from different lignin structural units have been identified. A significant proportion of LS ( 20%) is comprised by monomeric compounds, mainly 4-allyl-2,6-dimethoxyphenyl- -sulphonic and 4-propyl-2,6-dimethoxyphenyl-, -disulphonic acids. LS revealed partial degradation during the thin liquor evaporation leading to cleavage of ether and carbon-carbon linkages in the side chain and to the increasing of the condensation degree.
publisher TAYLOR & FRANCIS INC
issn 0277-3813
year published 2009
volume 29
issue 4
beginning page 337
ending page 357
digital object identifier (doi) 10.1080/02773810903207762
web of science category Materials Science, Paper & Wood
subject category Materials Science
unique article identifier WOS:000274364200006
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