De-ashing lubricating oils
US4247389A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 1979 |
| Grant date | Jan 27, 1981 |
| Priority date | — |
| Expiry date | Nov 7, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G2400/10
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for the production of an essentially ash-free oil stock from a lubricating oil containing ash-forming components comprising PA1 (a) contacting said lubricating oil with an aqueous ammonium salt treating agent; PA1 (b) removing a major portion of the water from the mixture resulting from combining said aqueous solution and said lubricating oil; PA1 (c) heating at least a portion of the product resulting from step (b) at a temperature in the range of about 320.degree. to about 420.degree. C. for a period of time sufficient to decompose at least a portion of any ammonium salts of sulfonic acid and dialkyldithiophosphoric acid that are contained therein; PA1 (d) cooling the product from step (c) to a temperature in the range of about 150.degree. to about 180.degree. C.; and PA1 (e) separating the solids from the product of step (d), optionally with subsequent hydrotreating and stripping of the oil thus obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.