| OCR Text |
Show 400°C. Table 2 summarizes the PIC/POHC ratlo information for t he 22 mixtures studied . This summary lists the PIC/POHC ratios a t 99% total POHC DE , whic h was de t e rmine d f or al l the mix t ures. Typically, the PIC/POHC r a t i os ran ged from ~S4- ~1 560 . Since the POHC concentra-tion tends to decrease faster than the PIC concentration in the vicinity 99-99.99% DE, the PIC/POHC ratios are expected to be greater at 99.99% DE. Of course, if one proceeds to sufficiently high tem-peratures, all of the PICs will also be destroyed. Discussion The results of this experimental study have been combined with the results of other experimental studies available in the literature on Appendix VIII organics as well as elementary reaction kinetic data and chemical reaction kinetic theory to devise an incinerability ranking of 304 organic compounds. In development of this ranking, it was estimated that 116, 85, and 103 compounds decomposed by bond homolysis, concerted elimination, and bimolecular radical attack, respectively. The trends observed the experimental data for the 36 compounds reported here are a reasonably representative subset of the complete ranking. The compounds with T99s below 800°C are generally expected to decompose by low activation energy unimolecular pathways. ~ Chloroform, dichlorofluoromethane, difluorochloromethane, and bromoform have very low energy three-center pathways available to form hydrochloric acid or hydrobromic acid and the corresponding diradical. [9,10] These reactions presumably have activation energies in the 40-60 kcal/mole range and are consequently observed I ~J |
