Detergent-dispersants of high alkalinity for lubricating oils and process for their preparation

摘要

New detergent-dispersants of high alkalinity useful as additives for lubricating oils and a novel process for their preparation are provided. The novel detergent-dispersant additives are prepared by: (1) sulfurizing an alkylphenol in the presence of an alkylbenzene sulfonate of low or zero T.B.N., an alkaline earth base and an alkylene glycol; (2) precarbonating the mixture thus obtained; (3) super-alkalinizing and carbonating the resultant precarbonated mixture by means of an alkaline earth base, CO2, and an alkylene glycol; and (4) eliminating the excess alkylene glycol. These detergent-dispersant additives improve the detergent-dispersant power of lubricating oils.