Patent ID: 6620311
Filing Date: 2003-09-16
Classification: C10G

Abstract:
A process for converting a hydrocarbon feed with a sulphur content of at least 0.05% by weight, an initial boiling point of at least 300Â° C., and an end boiling point of at least 400Â° C., comprising the following steps:step (a): treating the hydrocarbon feed in the presence of hydrogen, in a first treatment section comprising at least one three-phase reactor, containing at least one hydroconversion catalyst containing an at least partially amorphous mineral support, in an ebullated bed, operating in liquid and gas riser mode, said reactor comprising at least one means (17) for withdrawing catalyst from said reactor located close to the reactor bottom and at least one means (16) for supplying fresh catalyst to said reactor located close to the top of said reactor so as to produce an effluent EF0; step (b): sending at least a portion of the effluent EF0 from step a) to a separation section (2) operating at a pressure and temperature substantially identical to the pressure and temperature of the treatment section of step a), said separation section (2) producing a fraction F1 containing at least a portion of gas, gasoline and atmospheric gas oil contained in effluent EF0, and a fraction F2 principally containing compounds with boiling points that are higher than that of the atmospheric gas oil and a proportion of compounds with boiling points lower than those of the atmospheric gas oil; (b1) sending at least a portion of the fraction F2 from step (b) to a fractionation column from which a gas fraction is obtained, a light fraction F3 is obtained, at least a portion of which is sent to the treatment section of step (c), and a heavy fraction F4 is obtained, at least a portion of which is sent to the catalytic cracking section of step d) after expansion; step (c): sending at least a portion of the fraction F1 from step b) to a second treatment section, said treatment being carried out in the presence of hydrogen, said section comprising at least one reactor containing at least one fixed bed hydrodesulphurisation catalyst different than said hydro conversion catalyst wherein a mineral support is at least partially amorphous, under conditions enabling an effluent EF1 with a reduced sulphur content to be obtained; and step (d): after expansion, sending at least a portion of the fraction F2 from step b) to a catalytic cracking section in which it is treated under conditions that produce a cracking effluent EF2.