Process for converting heavy crude oil fractions, comprising an ebullating bed hydroconversion step and a hydrotreatment step

A process for hydrotreating a hydrocarbon feed comprising:

• treating the hydrocarbon feed in at least one three-phase reactor containing at least one ebullated bed of hydroconversion catalyst;
• sending a least a portion of the effluent from at least one three-phase reactor to at least one reactor containing at least one fixed bed of hydrotreatment catalyst;
• sending a least a portion of the effluent from at least one reactor containing at least one fixed bed of hydrotreatment catalyst to a distillation zone from which at least a diesel fraction and/or a fraction heavier than the diesel fraction are recovered;
• and
• recycling at least a portion of the diesel fraction and/or the fraction heavier than the diesel fraction to at least one three-phase reactor or at least one reactor containing at least one fixed bed of hydrotreatment catalyst.

The process for converting a hydrocarbon fraction with a sulphur content of at least 0.3%, an initial boiling point of at least 300° C., and an end point of at least 400° C., comprising:

• a) treating the hydrocarbon feed in a treatment section in the presence of hydrogen, said section comprising at least one three-phase reactor, containing at least one ebullated bed of hydroconversion catalyst the mineral support of which is at least partially amorphous, functioning in riser mode for liquid and gas, a line located near the bottom and in communication with the reactor for extracting catalyst from said reactor and a line located near the top and in communication with said reactor for adding fresh catalyst to said reactor;
• b) sending at least a portion of the effluent from a) to a section for treatment in the presence of hydrogen, said section comprising at least one reactor containing at least one fixed bed of hydrotreatment catalyst, the mineral support of which is at least partially amorphous, under conditions for producing an effluent with a reduced sulphur content and a higher middle distillates content;
• c) sending at least a portion of the effluent obtained from b) to a distillation zone c) wherein a gas fraction, a gasoline engine fuel fraction, a diesel engine fuel fraction and a liquid fraction heavier than the diesel fraction are recovered;
• and
• d) sending the liquid fraction heavier than the diesel fraction to a catalytic cracking section wherein the liquid fraction heavier than the diesel fraction is treated under conditions for recovering a gas fraction, a gasoline fraction, a diesel fraction and a slurry fraction.