METHOD OF PRODUCING HIGH-INDEX COMPONENTS OF BASE OILS Russian patent published in 2016 - IPC C10G21/00 C10G45/00 C10G47/00 C10G65/12 C10G67/04 C10G7/00 C10G71/00 C10G73/02 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing high-index base oil components corresponding to group II and III on API, and can be used in oil refining industry for producing high-index base oil components from unconverted residue of hydrocracking using dewaxing processes with selective solvents and catalytic hydrofining. Method is implemented by catalytic hydrocracking of oil stock at pressure not less than 13.5 MPa, temperature of 380-430 °C, volume rate of supply of raw material from 0.5 to 1.5 h^-1 with degree of conversion of not less than 75 % to produce unconverted hydrocracking residue, containing at least 90 wt% of saturated hydrocarbons, including isoparaffin hydrocarbons not less than 30 wt%, with its further fractionation and extraction of target fractions, which are subjected to dewaxing with selective solvents and hydrofining, characterised by that after fractionation, three narrow target fractions are extracted, as hydrocracking raw material along with straight-run raw material - vacuum gasoil, and product of secondary processing - coking gasoil, used are by-products of process of selective purification of: residual extract of selective purification of asphalt-free oil in amount of 4-6 wt%, and dewaxing: product dewaxing residual raffinate - petrolatum - from 1 to 3 wt%, which raises temperature of end boiling point of composite material of hydrocracking to 586 °C.

EFFECT: method enables to obtain high viscosity components of base oil with viscosity index of up to 126 points, with sulphur content of less than 30 ppm (0,0030 wt%) and content of saturated hydrocarbons of not less than 90 wt%, with kinematic viscosity at 100 °C from 3,88-7,56 mm²/s, which enables to vary range in production of commercial oil.

1 cl, 5 tbl