Abstract
Systematic studies of the independent effects of temperature (300-1100/sup 0/C), solids residence time (0-30 s), and heating rate (less than equivalent to 100-15000/sup 0/C/s) on the yields, compositions, and rates of formation of products from the rapid pyrolysis of 0.0101 cm thick sheets of cellulose under 5 psig pressure of helium have been performed. The experiments mainly probe the primary decomposition of the cellulose, with contributions from post-pyrolysis reactions being confined to those occuring within and closely proximate to the sample. Temperature and sample residence time are the most important reaction conditions in determining the pyrolysis behavior, while heating rate effects are explicable in terms of their influence on these two parameters. A heavy liquid product of complex molecular composition accounted for 40 to 83 wt % of the volatiles above 400/sup 0/C. Secondary cracking of this material increased with increasing residence time or temperature and was a significant pathway for producing several light gases. 9 refs.
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