Title:
Pyrolysis and Secondary Degradation Reactions of Softwood and Hardwood Lignins
Author(s):
Kawamoto, H., Asmadi, M., Saka, S.
Document(s):
Paper
Abstract:
Pyrolysis and secondary reactions of softwood and hardwood lignins were studied in an ampoule reactor (N2/ 600°C) with 1) guaiacol/syringol (as lignin aromatic nuclei), 2) intermediates from guaiacol/syringol pyrolysis and 3) milled wood lignins isolated from Japanese cedar (Cryptmeria japonica, a softwood) and Japanese beech (Fagus crenata, a hardwood). Coke, tar and gas formation pathways were clarified for guaiacol/syringol pyrolysis along with some molecular mechanisms for these processes. In the milled wood lignin pyrolysis, primary products were the guaiacol and syringol derivatives with various double bond side-chains (>C=C<, >C=O). These products were quickly converted into their secondary products, which were similar to those from guaiacol/syringol. Accordingly, most of the secondary reactions steps were understandable with those of guaiaco/syringol. Due to high condensation reactivity of the double bond structures of the primary products, solid/liquid-phase reactions were also important for the milled wood lignin pyrolysis. This reduced the yields of GC/MS-detectable low MW products, especially from the syringyl-units.
Keywords:
fast pyrolysis, gasification, lignin, pyrolysis, reactivity, tar
Topic:
Biomass Conversion Technologies for Heating, Electricity and Chemicals
Subtopic:
Pyrolysis for power, CHP, polygeneration and chemicals
Event:
19th European Biomass Conference and Exhibition
Session:
VP2.5.4
Pages:
1628 - 1632
ISBN-13:
978-88-89407-55-4
ISBN-10:
88-89407-55-7
Paper DOI:
10.5071/19thEUBCE2011-VP2.5.4
Price:
FREE
