Reclaiming used lubricating oils
US4151072A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 3, 1977 |
| Grant date | Apr 24, 1979 |
| Priority date | — |
| Expiry date | Oct 3, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10M175/0016
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An integrated process universally applicable for the reclaiming of used lubricating oils, regardless of the contaminants or previous additive systems contained therein, is provided to produce an intermediate low-ash oil or a high-grade lube oil stock which comprises (a) contacting the used oil with an aqueous ammonium salt treating agent, (b) removing a major portion of water, (c) separating the oil phase from the resulting residual product, (d) subjecting the resulting separated oil to hydrotreating and thereafter (e) stripping the resulting hydrotreated lube oil stock. Optionally the low-ash product of step (c) can be recovered for use as a fuel oil, in grease formulations, or in the preparation of some types of lubricating oil formulations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.