PROCESS FOR CONVERTING PETROLEUM FEEDSTOCKS COMPRISING A STAGE OF FIXED-BED HYDROTREATMENT, A STAGE OF EBULLATING-BED HYDROCRACKING, A STAGE OF MATURATION AND A STAGE OF SEPARATION OF THE SEDIMENTS FOR THE PRODUCTION OF FUEL OILS WITH A LOW SEDIMENT CONTENT

摘要

The invention relates to a process for treating a hydrocarbon-containing feedstock comprising the following stages: a) a stage of fixed-bed hydrotreatment, b) an optional stage of separation of the effluent originating from the hydrotreatment stage a), c) a stage of hydrocracking of at least a part of the effluent from stage a) or of at least a part of the heavy fraction originating from stage b), d) a stage of separation of the effluent originating from stage c), e) a stage of maturation of the heavy liquid fraction originating from the separation stage d), f) a stage of separation of the sediments from the heavy liquid fraction originating from the maturation stage e).

主权项

1. Process for treating a hydrocarbon-containing feedstock containing at least one hydrocarbon fraction having a sulphur content of at least 0.1% by weight, an initial boiling temperature of at least 340° C. and a final boiling temperature of at least 440° C. for obtaining a liquid hydrocarbon-containing fraction having a sediment content after ageing of less than or equal to 0.1% by weight, said process comprising the following stages:
a) a fixed-bed hydrotreatment stage, in which the hydrocarbon-containing feedstock and hydrogen are brought into contact on a hydrotreatment catalyst, b) an optional stage of separation of the effluent originating from the hydrotreatment stage a) into at least one light hydrocarbon fraction containing fuel bases and a heavy fraction containing compounds boiling at at least 350° C., c) a stage of hydrocracking of at least a part of the effluent originating from stage a) or of at least a part of the heavy fraction originating from stage b), in at least one reactor containing a supported ebullating-bed catalyst, d) a stage of separation of the effluent originating from stage c) in order to obtain at least one gaseous fraction and at least one heavy liquid fraction, e) a stage of maturation of the heavy liquid fraction originating from the separation stage d) making it possible to convert a part of the potential sediments to existing sediments, carried out for a duration comprised between 1 and 1500 minutes, at a temperature between 50 and 350° C., and a pressure of less than 20 MPa, f) a stage of separation of the sediments from the heavy liquid fraction originating from the maturation stage e) in order to obtain a liquid hydrocarbon-containing fraction having a sediment content after ageing of less than or equal to 0.1% by weight.