Orogil

Savino Leone

Henri Gaessler

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.

Process for preparing superalkalinized detergent-dispersant additives

Alkylsalicylate-containing detergent-dispersant additives for lubricating oils are obtained by (a) neutralizing an alkylphenol by means of an alkali metal hydroxide; (b) carboxylation of the product with carbon dioxide for maximum conversion of the initial alkali metal alkylphenate into alkali metal alkylsalicylate; (c) sulfurization-superalkalinization of the product in the presence of an alkaline earth base followed by carbonation of the product with carbon dioxide.

Detergent-dispersant additives based on salts of alkaline-earth and

Disclosed are detergent-dispersant additives useful in lubricating oils prepared by neutralizing an alkylphenol sulfonic acid, followed by sulfurizing/over-alkalinizing the salt obtained and then carbonating the resultant salt. Lubricating compositions comprising a lubricating oil and from about 1 to about 30% by weight of the final composition of a detergent-dispersant additive of the invention are also disclosed.

Growing community of inventors

Tassin Dela Demi-Lune, France

Savino Leone