加熱による金属ハロゲン化物の活性ハロゲン生成能およびそれらとジベンゾ‐ｐ‐ダイオキシンまたはジベンゾフランとの反応

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  • Potentials of Active Halogen Evolution upon Heating Metal Halides and Reactions of the Active Halogen and Dibenzo-p-dioxin/dibenzofuran in an Air Stream
  • 加熱による金属ハロゲン化物の活性ハロゲン生成能およびそれらとジベンゾ-p-ダイオキシンまたはジベンゾフランとの反応
  • カネツ ニ ヨル キンゾク ハロゲン カブツ ノ カッセイ ハロゲン セイセイノウ オヨビ ソレラ ト ジベンゾ p ダイオキシン マタハ ジベンゾフラン トノ ハンノウ

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The evolved gaseous samples from several metal halide particles upon heating at temperatures ranging from 200 to 500°C in a laboratory quarts tube reactor under dry air stream were analyzed to compare their potentials of active halogen formation. Total yields of the active halogen evolved were found to be one mole Cl per mole CuCl2 and two moles Br per mole CuBr2 at 300 °C for 30 min. A small amount of the active chlorine was detected when FeCl3 was heated under the same conditions. However, FeCl2, SnCl2, SnCl4, ZnCl2 and ZnBr2 did not produced the active halogen upon heating at temperature ranging 200 to 500°C for 60 min.<br>The efficiency of DD and DF halogenation by CuCl2 or CuBr2, and the distribution of halogenated DD/DF products were also measured using the tube reactor under the same pyrolysis conditions. At the gas velocity, corresponding to a resident time of 0.5 s in the reactor, monohalogenated DD/DF yields were largest, with yields decreasing with increasing DD/DF halogenation. The DD/DF halogenations were strongly favored at lateral sites, with the predominant halogenated DD/DF isomers within each homologue group those containing halogen substituents at only the 2,3,7,8 positions.

収録刊行物

  • 環境化学

    環境化学 17 (1), 17-26, 2007

    一般社団法人 日本環境化学会

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