PROCESS FOR DEEP CONVERSION OF RESIDUES MAXIMIZING PERFORMANCE IN GASOLINE

摘要

The invention relates to a method for deep conversion of a heavy hydrocarbon feedstock comprising the following steps: a) a first step of hydroconversion into a bubbling bed of the feedstock, b) a step of separation of at least a part of the feedstock. hydroconverted liquid effluent from step a), c) i) a step of hydrotreating at least a portion of the gas oil fraction and the vacuum gas oil fraction from step b), ii) a first hydrocracking step of at least a portion of the gas oil fraction and of the vacuum gas oil fraction resulting from step b), d) a step of fractionation of at least a portion of the effluent resulting from the step c) i) or step c) ii), e) a step of recycling at least a portion of the unconverted vacuum gas oil fraction from step d) fractionation in said first step a) of hydroconversion, f) a second step of hydrocracking at least a portion of the gas oil fraction resulting from step d) of fract ionisation, g) a step of recycling all or part of the effluent from step f) in fractionation step d).