| Abstract
| - The homogeneous, gas-phase oxidative thermal degradationof a 50:50 mixture of 2-bromophenol and 2-chlorophenolwas studied in a 1 cm i.d., fused silica flow reactor at aconcentration of 88 ppm, with a reaction time of 2.0 s, overa temperature range of 300 to 1000 °C. Observed productsin order of decreasing yield included the following: dibenzo-p-dioxin (DD), 4-bromo-6-chlorodibenzofuran (4-B,6-CDF), phenol, 4,6-dibromodibenzofuran (4,6-DBDF), 2,6-dibromophenol, 4,6-dichlorodibenzofuran (4,6-DCDF), 2-bromo-4-chlorophenol, 2,4-dibromophenol, 2-chloro-4-bromophenol,4-monobromodibenzofuran (4-MBDF), 4-monochlorodibenzofuran (4-MCDF), dibenzofuran (DF), 1-monobromodibenzo-p-dioxin (1-MBDD), 1-monochlorodibenzo-p-dioxin(1-MCDD), 2,4,6-tribromophenol, naphthalene, chloronaphthalene, bromonaphthalene, chlorobenzene, bromobenzene, and benzene. The results are compared andcontrasted with previous results reported for the oxidationsof pure 2-chlorophenol and 2-bromophenol as well asresults for the pyrolysis of the mixture of 2-chlorophenoland 2-bromophenol. 4,6-DBDF and 4,6-DCDF were observedin higher yields than under pyrolytic conditions butconsiderably less than the yields observed for the individualoxidation of 2-chlorophenol and 2-bromophenol. Theeffect on chlorine and bromine on the concentration ofhydroxyl radical is shown to control the dioxin-to-furan ratio.
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