Process and device for extracting oil or polychlorinated biphenyl from impregnated electrical components by means of a solvent, and for distillation of the solvent

摘要

In a heating-up phase, a solvent evaporates in an evaporator (2) located in an autoclave (1), and the solvent vapour condenses on the components, heats the latter and penetrates the electrical insulation in order to dissolve out the oil or polychlorinated biphenyl (PCB). In the heating-up phase, several intermediate reductions in pressure are carried out in the autoclave (1) and, during each intermediate pressure reduction, the solvent from the oil/solvent mixture or PCB/solvent mixture is distilled directly out of the autoclave (1), the solvent feed being isolated each time and the mixture being circulated via a circulation line (d-9-d-10-d-e). After the end of each intermediate pressure reduction, the pure oil or polychlorinated biphenyl present in the condensate container (9) is pumped out via a condensate discharge line (d) with an interposed conveying pump (10) and via a connecting line (g) into a stock tank (13). <IMAGE>