Abstract
Thermal decomposition curves of ten chlorinated dibenzo-para-dioxins were measured by a flow tube reactor with integrated gas chromatographic analysis of the reaction products. Residence times between .4 to 1 seconds were chosen for a direct comparison with hazardous waste disposal incinerators. The dependence of the decomposition rates on the carrier gas was studied and the rates were found to increase with added oxygen in nitrogen-oxygen mixtures. All dioxins studied were found to decompose between 850 and 1100°C in nitrogen. The observed decomposition rate constants in nitrogen decreased with increasing chlorination of the dioxins. This finding is in agreement with expectations for pure pyrolysis and suggests that CO bond rupture is the rate determining step.
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