Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1985-06-10
1988-04-19
Spear, Frank
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
210909, B01D 1104
Patent
active
047387807
ABSTRACT:
Method of replacing a PCB-containing coolant in electrical induction apparatus having a vessel containing said PCB-containing coolant, an electrical winding and porous solid cellulosic electrical insulation immersed in, and impregnated with, said PCB-containing coolant with a substantially PCB-free high boiling dielectric permanent coolant into which any residual PCBs elute at no greater than a selected target rate comprising steps of (a) draining the PCB-containing coolant from the vessel, (b) filling the vessel with an interim dielectric coolant, (c) electrically operating the apparatus, (d) removing interim coolant containing eluted PCB, (e) repeating steps (b), (c) and (d) a sufficient number of times until the PCB elution rate does not exceed 5 times a selected target rate, (f) filling the vessel with PCB-free high boiling dielectric silicone oil as coolant, (g) electrically operating the apparatus, (h) thereafter removing the silicone oil coolant containing eluted PCB, (i) repeating steps (f), (g) and (h) a sufficient number of times until the PCB elution rate into the silicone oil is less than the selected target rate, and refilling the vessel with a substantially PCB-free dielectric cooling liquid.
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Union Carbide Product Information, "An Environmentally Acceptable and Less Flammable Dielectric Fluid for Transformers", 12/81-3M, pp. 1-12.
Bresch Saul R.
Lewzzi Paul W.
Spear Frank
Union Carbide Corporation
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