期刊
BIORESOURCE TECHNOLOGY
卷 101, 期 23, 页码 9308-9313出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2010.06.140
关键词
Alkaline lignin; Hydrolytic degradation; De-polymerization; Phenol; Hot-compressed water and ethanol
资金
- Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)
- FedNor
- NOHFC
- NSERC
Alkaline lignin of a very high molecular weight was successfully degraded into oligomers in a hot-compressed water-ethanol medium with NaOH as the catalyst and phenol as the capping agent at 220-300 degrees C. Under the optimal reaction conditions, i.e., 260 degrees C, 1 h, with the lignin/phenol ratio of 1:1 (w/w), almost complete degradation was achieved, producing <1% solid residue and negligible gas products. The obtained degraded lignin had a number-average molecular weight M-n and weight-average molecular weight M-w of 450 and 1000 g/mol respectively, significantly lower than the M-n and M-w of 10,000 and 60,000 g/mol of the original lignin. A higher temperature and a longer reaction time favoured phenol combination, but increased the formation of solid residue due to the condensation reactions of the degradation intermediates/products. The degraded lignin products were soluble in organic solvents (such as THF), and were characterized by HPLC/GPC, IR and NMR. A possible mechanism for lignin hydrolytic degradation was also proposed in this study. (C) 2010 Elsevier Ltd. All rights reserved.
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