Process for the preparation of detergent dispersants of high alkalinity for lubricating oils and the product obtained therefrom
US4302342A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 1979 |
| Grant date | Nov 24, 1981 |
| Priority date | — |
| Expiry date | Jun 19, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10M159/24
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process is provided for preparing detergent-dispersant compositions of a TBN of at least about 200, containing at least about 2 percent magnesium, by: PA1 (1) sulfurization by sulfur of an alkylphenol in the presence of a magnesium and/or calcium alkylbenzene-sulfonate of a TBN less than or equal to about 150, an alkaline-earth component selected from among lime, mixtures of magnesium oxide and lime, or a magnesium oxide and alkali hydroxide, and an alkylene glycol; PA1 (2) optionally precarbonation of the resultant mixture by means of CO.sub.2 ; PA1 (3) super-alkalinization and carbonation of the resultant mixture by means of magnesium oxide and possibly lime, CO.sub.2 and alkylene glycol; and PA1 (4) removal of the excess alkylene glycol. The detergent-dispersant compositions obtained are useful in the improvement of the detergent-dispersant properties of lubricating oils.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.