Kinetics of the pyrolysis of cellulose in the temperature range 250–300°C

Autor:	William J. Parker, Anne E. Lipska
Rok vydání:	1966
Předmět:	Volatilisation Polymers and Plastics Chemistry Analytical chemistry General Chemistry Activation energy Atmospheric temperature range Decomposition Isothermal process Surfaces Coatings and Films Phase (matter) Materials Chemistry Organic chemistry Char Pyrolysis
Zdroj:	Journal of Applied Polymer Science. 10:1439-1453
ISSN:	1097-4628 0021-8995
DOI:	10.1002/app.1966.070101005
Popis:	Pure alpha cellulose samples were subjected to isothermal pyrolysis in a fluidized bath in a nitrogen environment at temperatures ranging from 250C to 298C. Results were reported in terms of volatilization (based on weight loss measurements) and decomposition (in term of glucosan loss). The findings indicate that there are essentially three distinct chronological phases of pyrolysis at each temperature studied. After an initial rapid decomposition and weight loss period, both the volatilization and the decomposition obey an apparent zero - order expression, followed by a kinetically first order phase for the weight loss, resulting in a residual char deposit which does not undergo further pyrolysis. The degree of decomposition and volatilization occurring during the zero-order phase increases with increasing temperature. A single activation energy of 42 kcal/mole describes both the decomposition and volatilization rates over the entire 250C to 298C range. (Author)
Databáze:	OpenAIRE
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