METHOD OF PRODUCING LOW-TEMPERATURE BASES OF HYDRAULIC OILS Russian patent published in 2019 - IPC C10G65/04 C10M101/00 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing low-solidification bases of low-viscosity and medium-viscosity hydraulic oils, in which petroleum feedstock is subjected to catalytic hydrocracking at a pressure of not less than 13.5 MPa, temperature from 380 to 430 °C, raw material feed rate volume from 0.5 to 1.5 h^-1 with degree of conversion of not less than 75 % to obtain non-converted residue of hydrocracking, containing not less than 90 wt% saturated hydrocarbons, including isoparaffin hydrocarbons of not less than 30 wt%, which is subjected to series: hydrofining, catalytic dewaxing (hydroisomerisation), hydrofinishing, fractionation with separation of fraction 275 °C – FB and vacuum distillation with separation of fractions 275–370 °C and 370 °C – FB as stiffening bases of low-viscous hydraulic oils with kinematic viscosity at 40 °C from 9.0 to 22.0 mm²/s and medium viscous hydraulic oils with kinematic viscosity at 40 °C from 22.01 to 50.6 mm²/s, respectively, and their compounding, wherein hydroprocesses are carried out at pressure less than 6.0 MPa.

EFFECT: simultaneous production of low-viscous and medium viscosity low-solidification bases of hydraulic oils corresponding to viscosity classes of 10, 15, 22, 32, 46 and higher according to GOST 17479.3-85.

1 cl, 10 tbl