Process for removing PCB's from electrical apparatus

Details Process for removing PCB's from electrical apparatus Process for removing PCB's from electrical apparatus

1984-07-18

1987-08-11

Yeung, George

Cleaning and liquid contact with solids

Processes

Including regeneration, purification, recovery or separation...

134 221, 134 31, 134109, B08B 500

Patent

active

046859721

ABSTRACT:
Disclosed is a process for removing polychlorinated biphenyls from electrical apparatus, particularly transformers, to achieve concentration levels of 50 ppm or less as required by the EPA. A dielectric fluid having a relatively low boiling point as compared to polychlorinated biphenyls and other contaminants and in which PCB's are soluble is selected. There is an external cooling loop through which the dielectric fluid is circulated maintaining the temperature and pressure of the transformer within its design limits. There is an external distillation loop where the liquid removed from the transformer is heated to boiling point of the selected dielectric fluid thereby vaporizing the dielectric fluid and leaving the polychlorinated biphenyls in liquid phase in the distillation vessel. The dielectric fluid vapor is then condensed and returned to solubilize remaining PCB's in the transformer.

REFERENCES:
patent: 3177126 (1965-04-01), Charreau
patent: 4341567 (1982-07-01), Roehl
patent: 4425949 (1984-01-01), Rowe, Jr.
patent: 4483717 (1984-11-01), Olmsted et al.

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