Treatment of PCB‐Laden Transformer Oil with Polyethylene Glycols and Alkaline Hydroxide

Abstract

The direct disposal of polychlorinated biphenyls (PCBs) in transformer oil by polyethylene glycols (PEGs) under basic condition is reported. The transformer oil containing PCBs was treated by the required amounts of PEGs and potassium hydroxide (KOH) for different reaction times and temperatures. Complete reaction produces aryl PEGs, which are the products of nucleophilic aromatic substitution. The relative efficiencies of the PCB treatment process were assessed in terms of destruction and removal efficiency (DRE, %). At the experimental conditions of 100 C and 7 h, 125 C and 3 h, and 150 C and 1 h, average DREs of PCBs better than 99.9999% were attained. In studying the chemical reaction of PCBs with PEG/KOH, it was confirmed that the process led to less chlorinated PCBs through a stepwise process with the successive elimination of chlorines. Particularly, the least chlorinated PCBs such as mono-and di-PCBs were not produced in our study. Furthermore, the treated transformer oil can be reused through simple segregating procedures.

Base-catalysed decomposition of polychlorinated biphenyls in transformer oils by mixture of sodium hydroxide, glycerol and iron

“…Ryoo et al . [ 18 ] found that reaction between polyethylene glycol (PEG) and PCBs is carried out by nucleophilic substitution in the presence of alkaline hydroxide. Liu et al .…”

“…Various mechanisms have been proposed for BCD. Ryoo et al [18] found that reaction between polyethylene glycol (PEG) and PCBs is carried out by nucleophilic substitution in the presence of alkaline hydroxide. Liu et al [19] considered hydrogen free radicals produced from decomposition of PCBs during thermal treatment as a factor for dechlorination.…”