Method for reclaiming waste lubricating oils
US4073720A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 22, 1976 |
| Grant date | Feb 14, 1978 |
| Priority date | — |
| Expiry date | Oct 22, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10M175/005
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method for purifying and reclaiming used lubricating oils containing additives such as detergents, antioxidants, corrosion inhibitors, extreme pressure agents and the like and other solid and liquid contaminants by preferably first vacuum distilling the used oil to remove water and low-boiling contaminants, and treating the dried oil with a solvent mixture of butanol, isopropanol and methylethyl ketone which causes the separation of a layer of sludge containing contaminants, unspent additives and oxidation products. After solvent recovery, the desludged oil is then subjected to conventional lubricating oil refining steps such as distillation followed by decolorization and deodorization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.