METHOD OF PRODUCING LOW-ASH ALKYLSALICYLATE DETERGENT-DISPERSING OIL ADDITIVE Russian patent published in 2017 - IPC C10M159/20 C10M159/22 C10M129/54 C10N30/06 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil refining. Method involves obtaining low-ash alkylsalicylate detergent-dispersing magnesium additive by neutralisation of alkyl(C_8-18)salicylic acid with a calculated amount of magnesium oxide MgO in presence of water, straight-run gasoline with boiling intervals 80–180 °C and oil M-6 at temperature 70–80 °C for 1–2 hours. Magnesium oxide used is its active form, characterised by iodine number not less than 75 mg-eq I₂/100 g MgO. Reaction mixture is fed into a carbonator reactor, where after adding a promoter – methanol and gasoline-solvent at 60 °C while stirring, carbonation of mixture fed into reactor with carbon dioxide occurs (molar ratio of MgO:CO₂=1:1). After carbonation reaction mixture is held for 30–120 minutes at temperature 45–65 °C, after which temperature in reactor is gradually increased to 90 °C and from reaction mass at low pressure promoter and water are distilled off. Further, reaction mass is purified from unreacted MgO by centrifuging at speed. Gasoline-solvent is removed by distillation in a vacuum.

EFFECT: method of producing detergent-dispersing additive is characterised by simplicity, manufacturability and low waste yield, and obtained product has high alkaline number with low ash content and is characterised by a system of improved antiwear properties of oil-base.

1 cl, 1 tbl, 1 ex