Patent ID: 11898108
Assignee: AXENS
Field: Chemical engineering (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A process for hydrocracking a petroleum feedstock (1) comprising at least 10% by volume of compounds that boil above 340° C., said process comprising:
(a) at least one step of hydrocracking the feedstock in order to obtain a hydrocracked effluent;
(b) a step of liquid/gas separation of the hydrocracked effluent in order to obtain a gaseous effluent (5) and a liquid effluent (9);
(c) a step of fractionating said liquid effluent (9), in at least one fractionating column (12), at a pressure P1 at the bottom of the column, to produce at least a first distillate (13, 14) and a first residue (15),
(d) a step of recycling a first portion (18) of said first residue (15) to the hydrocracking step and/or at least one of the hydrocracking steps,
(e) a step of rectifying a second portion (20) of the first residue (15) obtained in the fractionating step, carried out in at least one column (21), at a pressure P2 at the top thereof which is at least 0.05 MPa lower than pressure P1, to obtain at least a secondary distillate (23), a secondary residue (16) and a vapor stream (22),
(f) a step of purging at least one portion or all of the secondary residue (16),
(g) a step of recycling all or part of said secondary distillate (23) to the hydrocracking step or to at least one of the hydrocracking steps, after an optional gas separation step.