Alkaline Hydrothermal Dechlorination of Chlorobenzene in Transformer Oil

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Application of alkaline hydrothermal reaction to the dechlorination of a small amount of PCB in transformer oil was investigated with the aim of reusing the transformer oil with chlorobenzene instead of PCB. Examination of the influence of parameters related to performance of the dechlorination reaction, the influence of the transformer oil and the possibility of transformer oil reuse gave us the following results. (1) Dechlorination of more than 99.99% was obtained by reaction at a temperature of 400°C and a reaction time of 2 min using 1 N NaOH. (2) Hydration reaction proceeded with the dechlorination to form phenol and some phenol formed was subsequently converted to biphenyl. (3) KOH was more effective than NaOH for dechlorination at temperatures higher than 290°C. (4) The apparent activation energies of the dechlorination reaction for NaOH and KOH were 135-137 kJmol<SUP>-1</SUP> and 187 kJmol<SUP>-1</SUP>, respectively and a transformer oil as a distribution medium affected the frequency factor. These results may imply that alkaline hydrothermal treatment of transformer oil contaminated with a small amount of PCB could be used for recovery.
一般社団法人廃棄物資源循環学会の論文