Distillation: processes – separatory – With disparate physical separation – Utilizing liquid-liquid extracting of distillation product
Patent
1987-12-16
1988-08-16
Lacey, David L.
Distillation: processes, separatory
With disparate physical separation
Utilizing liquid-liquid extracting of distillation product
208262, 208317, 208318, 208321, 210634, C10G 2128, C10G 2112
Patent
active
047642564
ABSTRACT:
A method is provided for continuous removal of polychlorinated biphenyl compounds (PCB) from oil contaminated 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 PCB 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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Electric Power Research Institute Inc.
Hastings K. M.
Lacey David L.
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