Abstract
High temperature PCB dechlorination (Aroclor 1016) occurred using NaBH 4 alone in tetraglyme at 290–310°C within 2 h in a sealed tube. Aroclor 1016 dechlorination was also quantitatively achieved using NaBH 4/LiCl/glyme solvents (di-, tri-, or tetraglyme) at 125–135°C. The best results were obtained by prestirring NaBH 4, LiCl and the glyme solvent at room temperature before heating at 125–135°C. At equivalent conditions, PCB dechlorination rates were found to depend on solvent in the order: tetraglyme>triglyme>diglyme. At 130°C, Aroclor 1016 can be dechlorinated in NaBH 4/LiCl/tetraglyme in 4 h. 2-Chlorobiphenyl and 2,2′-dichlorobiphenyl were the least reactive congeners in dechlorinations with NaBH 4/LiCl in diglyme. Competitive dechlorinations with NaBH 4/LiCl in diglyme showed 3-chloro- and 4-chlorobiphenyl reacted faster than 2-chlorobiphenyl at 130°C. The reactions were clean with no solvent decomposition in the range of 120–162°C.
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