Primary and secondary lignin pyrolysis reaction pathways
The reaction pathways involved in the pyrolysis of kraft lignin, kraft lignin plus tetralin, a milled wood lignin, and pine wood were examined. The temporal variations of the quantitative yields of 33 different products, including 12 gases, water, methanol, and 19 phenolics allowed resolution of primary and secondary pathways, description of the influence of reactor design and lignin type on product yields, and formulation of a simple kinetic lumping scheme. Products within separate guaiacol and catechol lumps attained maximal proportions at 7.5 and 15 min, respectively, during kraft lignin pyrolysis at 400/sup 0/C. Within a lump, the secondary reactions of individual species were nearly synchronous. Further, the similarity of the observed rate of the secondary decomposition of guaiacols during kraft lignin pyrolysis with that previously reported for pyrolysis of pure guaiacol suggest that the reactions of lignin's thermally liberated single-ring products are insensitive to the presence of other molecular species or poymer residuum. All of the foregoing indicates that a simple reaction network based on phenol, guaiacol, and catechol lumps could be a useful model of phenolics product evolution.
- Research Organization:
- Department of Chemical Engineering, University of Delaware, Newark, Delaware
- OSTI ID:
- 5350347
- Journal Information:
- Ind. Eng. Chem. Process Des. Dev.; (United States), Vol. 24:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
LIGNIN
PYROLYSIS
METHANOL
CHEMICAL REACTION YIELD
PRODUCTION
TETRALIN
WOOD
CHEMICAL REACTION KINETICS
CHEMICAL REACTORS
GASES
HIGH TEMPERATURE
PHENOLS
POLYMERS
PYROCATECHOL
PYROLYSIS PRODUCTS
WATER
ALCOHOLS
AROMATICS
CARBOHYDRATES
CHEMICAL REACTIONS
DECOMPOSITION
DEVELOPERS
FLUIDS
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
KINETICS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
POLYPHENOLS
POLYSACCHARIDES
REACTION KINETICS
SACCHARIDES
THERMOCHEMICAL PROCESSES
YIELDS
090221* - Alcohol Fuels- Chemical Synthesis- (1976-1989)
400800 - Combustion
Pyrolysis
& High-Temperature Chemistry