Process for the extraction of oil or polychlorinated biphenyl from electrical parts through the use of solvents and for distillation of the solvents
US4879004A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 4, 1988 |
| Grant date | Nov 7, 1989 |
| Priority date | — |
| Expiry date | May 4, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/909
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
In order to dissolve oil or PCB which exists in the electrical insulation of parts to be cleaned, a solvent is evaporated during a heating phase by an evaporator located with the parts in an autoclave. The solvent vapor condenses on the parts and penetrates into the electrical insulation to form an oil or PCB-solvent mixture. In the heating phase, a plurality of intermediate pressure reductions are carried out in the autoclave, and during each intermediate pressure reduction the solvent is simultaneously distilled out of the oil or PCB-solvent mixture, directly from the autoclave. That is, during each of the pressure reductions, the solvent supply is discontinued and the mixture circulated through a circulating line. Following the completion of each intermediate pressure reduction, the pure oil or PCB present in a condensate vessel is pumped out by an intermediately located feed pump through a connecting line and into a reservoir.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.