METHOD OF PRODUCING SULFOPHENOLATE ADDITIVES Russian patent published in 2025 - IPC C10M159/22 C10M159/24 

FIELD: petrochemistry.

SUBSTANCE: invention relates to petrochemistry, to methods of producing alkaline alkylphenol (sulfophenolate) additives for lubricating oils. Invention relates to a method of producing sulfophenolate additives, involving reaction at elevated temperature of C₈-C₁₈ alkylphenol, sulphur and calcium oxide or hydroxide in the presence of ethylene glycol, a neutralization reaction at a first step, reaction of the obtained product with an additional amount of calcium oxide or hydroxide and ethylene glycol in a second step, followed by treatment with carbon dioxide, wherein the first stage of the process is carried out by introducing a diluent oil, which is used as esters of terephthalic acid in amount of 60-67% of the weight of alkylphenol, wherein first, when heated to temperature of 115-120 °C suspension of esters of terephthalic acid with calcium oxide or hydroxide, ethylene glycol and sulphur is prepared, then alkylphenol C₈-C₁₈ is added to the obtained mixture.

EFFECT: development of a method of producing an additive for lubricating oils, which enables to improve colloidal stability of solutions of additives, antioxidant and antifriction properties of commercial lubricants containing the additive.

2 cl, 1 tbl, 9 ex