Process for regenerating exhausted oils
US4233140A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 1978 |
| Grant date | Nov 11, 1980 |
| Priority date | — |
| Expiry date | Dec 18, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10M175/005
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
For refining spent motor oils in order to recover lubricating bases to be reused, the stock to be refined is first stripped of water and light hydrocarbons, then a first extraction with a solvent (preferably a lower paraffin), heating the oil stripped of the solvent, distilling it under vacuum to separate light, medium and heavy lubricating bases, heating the heavier lubricating base and then extracting it with the same solvent as aforesaid, and sending the lubricating bases, separately and individually, to a hydrofinishing stage. The recycle to solvent extraction of the heavy bases affords the advantage of important heat savings and the possibility of adopting blander working conditions in the hydrofinishing of the heavier lubricating bases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.