Modification of acid hydrolysis lignin for value-added applications by micronization followed by hydrothermal alkaline treatment
authors Krutov, SM; Evtuguin, DV; Ipatova, EV; Santos, SAO; Sazanov, YN
nationality International
journal HOLZFORSCHUNG
author keywords C-13 NMR; electrospray ionization-mass spectrometry (ESI-MS); micronization; size-exclusion chromatography (SEC); technical hydrolysis lignin
keywords TECHNICAL LIGNINS; PRODUCTS; EXTRACTION; WOOD
abstract Technical hydrolysis lignin (THL) was micronized by grinding in a rotary-jet mill to obtain a fraction of approximately 5 mm. Both initial and milled THLs were liquefied by thermal alkaline treatment at 220 degrees C for 2 h. Upgraded THLs that were nonmilled (L1) and milled (L2) were desalted by treatment with cation-exchanged resin and were dried. Micronization affected the course of hydrothermal alkaline treatment and the structure and composition of the obtained lignin. Thus, L2 contained much less concomitant polysaccharides and extractives than L1 and was more condensed. The molecular weights of L1 and L2 were 1100 and 1000 Da, respectively, as determined by size-exclusion chromatography. Structural characterization carried out by employing tandem electrospray ionization-mass spectrometry and 1D and 2D nuclear magnetic resonance spectroscopy revealed that small amounts of beta-O-4 (similar to 6 mol.%), beta-5, and beta-beta structures still remained in L1 and L2. Overall, upgraded lignins are oligomers (trimers--pentamers) with highly degraded propane chains and possess polyconjugated condensed aromatic structures. Upgraded THL seems to be a promising raw material for polymeric formulations.
publisher WALTER DE GRUYTER GMBH
issn 0018-3830
year published 2015
volume 69
issue 6
beginning page 761
ending page 768
digital object identifier (doi) 10.1515/hf-2014-0264
web of science category Forestry; Materials Science, Paper & Wood
subject category Forestry; Materials Science
unique article identifier WOS:000358410200013
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