Process for refining electric insulating liquids
US4358379A · kind A · utility
Inventor
Key dates
| Filing date | Nov 21, 1980 |
| Grant date | Nov 9, 1982 |
| Priority date | — |
| Expiry date | Nov 21, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G32/02
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of efficiently eliminating impurities, particularly of low molecular weight and low concentration, from electric insulating liquids by means of applying an electric field to the electric insulating liquid to charge the contaminant particles therefrom and then contacting the thus-treated liquid with at least one absorbent to remove the charged contaminant particles from said liquid by means of an absorbent having ion-radicals in its structure, such as zeolite, and then eliminating the rough particles therefrom by means such as a percolator, centrifuge or precipitation tank. In certain cases wherein a large amount of contaminants which interfere with the insulating properties of the electric insulating liquid are present, the electric insulating liquid is first heated and subsequently contacted with an absorbent prior to the step of applying an electric field to preliminarily remove contaminants therefrom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.