Removal of polychlorinated biphenyls by solvent extraction

Details Removal of polychlorinated biphenyls by solvent extraction Removal of polychlorinated biphenyls by solvent extraction

C - Chemistry, Metallurgy

10

M

196/263

C10M 175/00 (2006.01) C10G 21/00 (2006.01) C10G 21/28 (2006.01)

Patent

CA 1265086

ABSTRACT A method is provided for continuous removal of poly- chlorinated biphenyl compounds (PCB) from oil contamin- ated therewith, comprising the steps of continuously extracting PCB compounds from contaminated oil with a PCB-selective solvent in the stripping section of a multistage extraction zone, partially distilling the extract from the extraction zone in a distillation zone, cooling and separating the bottom residue into a solvent phase and an oil/PCB phase, continuously recycling a major portion of the oil/PCB phase as extract reflux to the enriching section of the extraction zone where PCs compounds are extracted from the recycled portion by the solvent phase produced in the stripping section of the extraction zone to increase the PCB content of the extract, and withdrawing a minor portion of the oil/PCB phase from the separation step as a disposable PCB residue.

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