METHOD OF HYDROGENATION REFINING OF RESIDUAL OIL STOCK Russian patent published in 2019 - IPC C10G65/04 C10G45/38 C10G45/50 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil refining. Invention relates to a method for hydrogenation refining of residual oil stock on stationary layers of catalysts, involving the following stages: hydrodemetallisation of petroleum feedstock, subsequent hydrogenation desulphurisation and rectification of the obtained hydrogenated product with separation of distillate fractions and residue, returning a portion of the recovered gas-oil distillate fraction for mixing with the feedstock. Hydrodemetallisation stage is carried out in two parallel located alternating reactors, loaded with a catalyst system, which is layers arranged in a sequence starting from the distribution device of the pre-reactor: 1st layer is an inert ceramic material with a free volume fraction of not less than 55 %, 2nd layer – alumina nickel-molybdenum catalyst with specific surface area of not less than 100 m²/g, containing not less than 60 % of total porous pore volume with diameter of 17–25 nm and more than 5% of total porous pore volume with diameter of more than 50 nm, 3rd layer – alumina nickel-molybdenum catalyst with specific surface area of not less than 150 m²/g, containing not less than 40% of total porous pore volume of diameter of 10–17 nm, with ratio of layers of 20:(30÷35):( 45÷50) % of volume, with duration of operation cycle of each foreactor from 3,000 to 4,000 hours. Further, a hydrodeodisation step is carried out in a reactor loaded with an alumino-nickel-molybdenum-tungsten catalyst, a modified phosphorus, with specific surface area of not less than 200 m²/g, containing not less than 40% of total porous volume of pore with diameter of 5–10 nm. Subsequent step of hydrogenation desulphurisation is carried out in a reactor loaded with alumo-cobalt-molybdenum-tungsten catalyst, modified with phosphorus, with specific surface area of not less than 250 m²/g, containing not less than 60% of total porous pore volume with diameter of 3–8 nm. 50–80 wt% is directed to mixing with the raw material obtained after fractionation of gas-oil distillate fraction, remaining portion of gas-oil distillate fraction is removed as component of marine fuel or is supplied for mixing with rectification fraction, and the rectification fraction or the rectification fraction in the mixture with the rest of the gas-oil distillate fraction is separated as residual marine fuel with sulfur content of not more than 0.5 wt%.

EFFECT: obtaining marine fuel with sulfur content less than ½ wt% corresponding to RMG180 and RME180 (GOST 32510-2013).

4 cl, 1 dwg, 3 ex