METHOD OF HYDRO-DESULFURIZATION OF OLEFIN GASOLINE Russian patent published in 2021 - IPC C10G45/02 C10G65/04 C10G65/16 

FIELD: fuel industry.

SUBSTANCE: present invention concerns a method for processing gasoline containing sulfur-containing compounds, olefins and diolefins, including the following steps: а) fractionation of gasoline into at least: fraction of light gasoline LCN; the primary intermediate fraction of gasoline MCN; and the primary fraction of heavy gasoline HCN; where step a) is carried out in two stages of fractionation: а1) fractionation of gasoline into a fraction of light gasoline LCN and an intermediate fraction of heavy gasoline HCN; а2) fractionation of an intermediate fraction of heavy gasoline HCN into at least one primary intermediate fraction of gasoline MCN and a primary fraction of heavy gasoline HHCN; b) desulphurization (desulphurization) of only the primary intermediate fraction of gasoline MCN in the presence of a hydro-desulphurization catalyst and hydrogen, at a temperature in the range from 160 to 450°С, at a pressure in the range from 0.5 to 8 MPa, with a volumetric flow rate in the range from 0.5 to 20 hr^-1, and with the ratio between the flow rate of hydrogen, expressed in normal m³ per hour, and the flow rate of processed raw materials, expressed in m³ per hour under standard conditions, in the range from 50 under n.c.m³/m³ and 1,000 under n.c.m³/m³, with obtaning at least partially desulfurized primary intermediate fraction of gasoline MCN; c) desulfurization of only the primary fraction of heavy gasoline HHCN in the presence of a hydrodesulfurization catalyst and hydrogen at a temperature within the range from 200 to 450 C, at a pressure in the range from 0.5 to 8 MPa, with the volumetric flow rate in the interval from 0.5 to 20 hr^-1, and the ratio between the hydrogen flow, expressed in normal m³ per hour, and the consumption of processed raw material, expressed in m³ per hour under standard conditions, in the range from 50 under n.c.m³/m³ and 1,000 under n.c.m³/m³, with obtaning at least partially desulfurized primary fraction of heavy gasoline HHCN; d) feeding as a mixture of partially desulfurized primary intermediate fraction of gasoline MCN, not subjected to further processing of Stage b), and partly desulfurized primary heavy fraction HHCN, not subjected to further processing at Stage c), into a separation column with the release of gaseous stream containing hydrogen and H₂S, the secondary intermediate fraction of MCN gasoline with low sulfur and mercaptans and the secondary fraction of heavy gasoline HHCN containing sulfurous compounds, including recombination mercaptans; е) desulphurization of the secondary fraction of heavy gasoline HHCN, coming out from Stage d), containing sulfurous compounds, including recombination mercaptans, in the presence of a hydro-desulphurization catalyst and hydrogen, at a temperature in the range from 200 to 450°С at a pressure in the range from 0.5 to 8 MPa, with a volumetric flow rate in the range from 0.5 to 20 h^-1, and with the ratio of hydrogen consumption expressed in normal m³ per hour, and the consumption of processed raw materials, expressed in m³ per hour under standard conditions, in the range from 50 under n.c.m³/m³ and 1,000 under n.c.m³/m³.

EFFECT: effective method is provided to improve oil products quality by desulphurization.

11 cl, 2 tbl, 1 ex, 2 dwg