METHOD OF CONVERTING A HEAVY HYDROCARBON FEEDSTOCK, INVOLVING SELECTIVE DE-ASPHALTING UPSTREAM FROM CONVERSION STEP

摘要

FIELD: chemistry.;SUBSTANCE: invention relates to a method of converting a heavy hydrocarbon fraction having a boiling point of at least 300 °C. Method includes the following stages: a) at least one stage of selective deasphalting of heavy hydrocarbon feedstock by means of liquid extraction, providing separation of at least one asphalt fraction, at least one deasphalted oil fraction, wherein at least one of said deasphalting steps is carried out using a mixture of at least one polar solvent and at least one apolar solvent, wherein volume ratio of polar solvent in mixture of polar solvent and apolar solvent is from 0.1 to 95 %, wherein the polar solvent is selected from pure aromatic or naphthenic aromatic solvents, wherein the polar solvents contain hetero-elements or mixtures thereof. At that, the apolar solvent contains a solvent consisting of a saturated hydrocarbon containing a number of carbon atoms higher than or equal to 2, wherein deasphalting steps are carried out in subcritical conditions of used mixture of solvents. Temperature ranges from 50 to 350 °C, preferably from 90 to 320 °C, and pressure ranges from 0.1 to 6 MPa, b) one step of hydrofracturing the deasphalted oil fraction in the presence of hydrogen in at least one three-phase reactor, wherein said reactor contains at least one hydroconversion catalyst and operates in a fluidised bed with an upward flow of liquid and gas and comprises at least one catalyst discharge device from said reactor and at least one fresh catalyst feed device to said reactor, in conditions allowing to obtain an effluent stream containing a gas fraction containing for the most part H₂ and H₂S, and liquid fraction with reduced content of carbon according to Conradson, metals, sulphur and nitrogen, c) one step of separating the effluent from step b) to obtain a gas fraction containing for the most part a compound H₂ and H₂S, and a liquid fraction with reduced content of carbon according to Conradson, metals, sulphur and nitrogen.;EFFECT: use of the proposed invention increases flexibility and functionality of the raw material conversion scheme according to the invention.;21 cl, 6 tbl, 3 ex