Thermogravimetric Analysis of Wood Lignin and Hemicelluloses


  • F. C. Beall


Dynamic thermogravimetric analysis was performed on five forms of lignin and nine preparations of hardwood and softwood hemicelluloses. Kinetic parameters were determined for pyrolysis and combustion in nitrogen and oxygen over 25 to 1000 C at 6 C/min. The weight loss data were analyzed for activation energies assuming zero and first order decomposition with an Arrhenius behavior. Lignin stability appeared related to preparation and molecular weight, with sulfuric acid as the least representative of protolignin behavior. Softwood and hardwood hemicelluloses degraded characteristically. Softwood compression wood galactan degraded catastrophically during the combustion analysis.


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