Process for preparing superalkalinized detergent-dispersant additives for lubricating oils
US5035816A · kind A · utility
6Cited by
7References
9Claims
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Key dates
| Filing date | Sep 20, 1988 |
| Grant date | Jul 30, 1991 |
| Priority date | — |
| Expiry date | Sep 20, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10M159/22
- WIPO fieldBiotechnology
- WIPO sectorChemistry
Abstract
A process for preparing alkylsalicylate superalkalinized detergent-dispersant lubricating oil additives: (a) by the acid catalyzed neutralization of C.sub.12 -C.sub.30 alkylphenol with alkaline earth base in the presence of an azeotropic solvent for the water of reaction; (b) by the carboxylation of the first product with CO.sub.2 to partially convert the alkylphenate to alkylsalicylate; and (c) by sulfurization-superalkalinization of the product in the presence of sulfur, alkaline earth base, azeotropic solvent and added CO.sub.2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.