Process for removing polychlorinated biphenyls from transformer-

Details Process for removing polychlorinated biphenyls from transformer- Process for removing polychlorinated biphenyls from transformer-

1985-01-18

1986-03-25

Cintins, Ivars

Liquid purification or separation

Processes

Ion exchange or selective sorption

210674, 210677, 210690, 210909, B01D 1500

Patent

active

045781940

ABSTRACT:
Process for the long-duration removal of polychlorinated biphenyls (PCB) from transformer-insulating liquids when substituting insulating liquids, particularly silicon oils, for PCB oils. The PCB contaminants can be removed continuously or substantially continuously from the transformer-insulating liquids using an adsorption resin, thus preventing PCB from accumulating in the transformer-insulating liquid. The insulating liquid is passed substantially continuously through the adsorption resin; adsorption resin, after enrichment with PCB oil, is washed with a solvent for PCB oils; and the washed resin is freed from residual solvent by rinsing it with a gas prior to reusing the thus regenerated resin to adsorb additional PCB oil.

REFERENCES:
patent: 4042498 (1977-08-01), Kennedy
patent: 4197195 (1980-04-01), Ochsenfeld et al.
patent: 4303531 (1981-12-01), Kawabata et al.
patent: 4477354 (1984-10-01), Fessler
patent: 4526677 (1985-07-01), Grantham et al.

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