METHOD OF OBTAINING DETERGENTS FOR LUBRICANTS

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FIELD : chemistry. SUBSTANCE : invention relates to improved method of salicylates of alkaline earth metals for application as detergents for lubricating materials. Method of obtaining alkylated salicytates of alkaline earth metals includes following stages : A) alkylating salicylic acid with linear α-olefin, containing, at last, 14 carbon atoms, in presence of water-free methane sulfonic acid with formation of oil-soluble alkylated salicylic acid; B) neutralisation of oil-soluble alkylated salicylic acid; C) excessive alkalisation of oil-soluble alkylated salicylic acid by carboxylating lime by means of CO2 in presence of oxygen-containing organic solvent and surface-active substance; D) filtration of stage (C) product; and E) removal of solvent by distillation. Alternatively, alkylsalicylic acid can be subjected to interaction with preliminary processed with alkali highly-alkaline sulfonate of earth alkaline metal, for instance, with calcium sulfonate, in order to obtain salicylate salts of earth alkaline metals with different per cent content of dispersed salts of alkaline earth metals carbonates. In claimed method it is not necessary to filter end product which is preferable doe industry. EFFECT : obtaining salicylates of alkaline earth metals for application as detergents for lubricating materials. 8 cl, 4 ex