| 摘要 |
A process is provided for preparing detergent-dispersant compositions of high alkalinity by: 1. Carbonation, at a temperature of between about 100 DEG C. and 250 DEG C., with carbon dioxide of a reaction medium comprising a sulfurized alkylphenate of an alkaline-earth metal having a TBN of between about 1 and 170, an alkaline-earth metal alkylbenzene sulfonate having a molecular weight of more than about 300 and a TBN of less than or equal to about 150, an alkaline-earth metal compound, an alkylene glycol, and a dilution oil; 2. Removal of the alkylene glycol; and 3. Separation of the superalkalinized metallic detergent-dispersant thus obtained. The metallic detergent-dispersant compositions obtained are useful in improving the detergent-dispersant power of lubricating oils. |
