Cleaning and liquid contact with solids – Processes – Including application of electrical radiant or wave energy...
Patent
1987-11-30
1989-05-02
Pal, Asok
Cleaning and liquid contact with solids
Processes
Including application of electrical radiant or wave energy...
134 251, 134 32, 134 34, 134 42, B08B 312
Patent
active
048265381
ABSTRACT:
A method for removing an insulating fluid containing polychlorinated biphenyl (PCB) which was used as an insulating medium, from the pores of a porous solid electrical insulating part which had been immersed in PCB-containing insulating fluid of an electrical apparatus from the group consisting of electrical transformers, chokes and capacitors includes the steps of removing the insulating part from the electrical apparatus and subsequently immersing the insulating part in a bath containing at least one fluid solvent for PCB selected from the group consisting of aliphatic, aromatic, chlorinated and fluorinated hydrocarbons. The insulating part is moved within the bath for a period of from 8-60 minutes at a speed of from 0.02 to 0.5 meters per second, and the solvent of the bath is heated during the movement of the insulating part from the ambient temperature to a final temperature of from 5.degree. to 25.degree. C. below the boiling temperature of the solvent at the pressure prevailing in the bath. The solvent is subjected to ultrasonic waves having a frequency of from 15 to 40 kHz.
REFERENCES:
patent: 2860646 (1958-11-01), Zucker
patent: 3001532 (1961-09-01), Plassmeyer
patent: 4055507 (1977-10-01), Dastur et al.
patent: 4425949 (1984-01-01), Rowe
patent: 4483717 (1984-11-01), Olmsted et al.
patent: 4685972 (1987-08-01), Fowler
Sanders Gerhard
Wessling Erwin
BBC Brown Boveri Aktiengesellschaft
Greenberg Laurence A.
Lerner Herbert L.
Pal Asok
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