PROCESS FOR PREPARING ALKYLSALICYLATE ADDITIVE TO LUBRICATING OILS Russian patent published in 1994 - IPC

FIELD: chemical industry. SUBSTANCE: alkylsalicylate additives to lubricating oils are prepared by reacting alkyl-C₁₄-C₁₈-salicylic acids with potassium hydroxide and carbon dioxide at 80-140 C and at a residual pressure of 0,01-1 kg/cm² in the presence of a promoter. The promoter is ethylene glycol or methyl(ethyl)cellusolve in an amount of 10-20 wt % per the reaction mixture. Potassium hydroxide may be used in an amount by 1.3-1.5 times exceeding the stoichiometric amount. EFFECT: improved properties of the additive. 2 cl, 1 tbl