AN IMPROVED RESIDUAL CONVERSION METHOD INTEGRATING DEEP HYDROCONVERSION STEPS INTO A DRIVEN BED AND A DISASPHALTAGE STEP

摘要

The invention relates to a process for converting heavy hydrocarbon feedstocks at least 50 wt% at a temperature of at least 300 ° C, and in particular residues under vacuum. The feeds are subjected to a first step a) of deep hydroconversion into a driven bed, possibly followed by a step b) of separation of a light fraction, and a heavy residual fraction obtained from step b) is obtained. at least 80% by weight of which has a boiling point of at least 250 ° C. Said fraction resulting from step b) or the effluent resulting from step a) is then subjected to a second step c) deep hydroconversion into a driven bed. The overall hourly space velocity for steps a) to c) is less than 0.1 hr-1. The effluent from step c) is fractionated to separate a light fraction. The heavy fraction obtained, 80% by weight of which is at a temperature of at least 300 ° C., is sent to a deasphalting step e). The deasphalted fraction DAO is then preferably converted into a step f) chosen from bubbling bed hydroconversion, fluidized bed catalytic cracking and fixed bed hydrocracking.