METHOD FOR OBTAINING BASIS OF FLAME-RETARDANT OIL Russian patent published in 2018 - IPC C10M105/74 C10G51/00 C10M111/00 C10N40/08 

FIELD: technological processes.

SUBSTANCE: invention relates to organic synthesis and relates to a process for preparing a flame retardant triaryl phosphate oil base. Process is carried out by mixing triphenyl phosphate with para-t-butylphenol in a molar ratio of 1:(0.45–0.55) and a catalyst with potassium carbonate. Resulting mixture is heated, gradually increasing the temperature to 200 °C, under vacuum at a residual pressure of 10–15 mm Hg, driving off the phenol. After distilling off the phenol, the reaction mixture is cooled to a temperature of 40–45 °C and the catalyst is neutralized with hydrochloric or sulfuric acid. Precipitate is filtered off, the filtrate is subjected to vacuum fractional distillation at a residual pressure of 10–15 mm Hg, while during distillation of excess triphenyl phosphate, the temperature is maintained in the boiling range of triphenyl phosphate. Moreover, 0.5–1.0 wt. % potassium carbonate based on triphenyl phosphate.

EFFECT: proposed process conditions provide the desired product corresponding to the commercial mixtures of phenyl/para-tert-butylphenylphosphates meeting the requirements for use as a base for a flame-retardant turbine oil and in hydraulic control systems, simplifying the process of obtaining it and increasing the yield.

3 cl, 2 tbl, 8 ex