PROCESS FOR REFINING A HYDROCARBON FEEDSTOCK OF THE VACUUM RESIDUE TYPE USING SELECTIVE DEASPHALTING, A HYDROTREATMENT AND A CONVERSION OF THE VACUUM RESIDUE FOR PRODUCTION OF GASOLINE AND LIGHT OLEFINS

摘要

The invention relates to a method for refining a heavy feedstock of the vacuum residue type. The present invention comprises the steps of a) selectively deasphalting the feedstock by a single-stage liquid/liquid extraction in an extractant, the extraction being conducted by means of a mixture of at least one polar solvent and at least one apolar solvent, so as to obtain an asphalt phase and a deasphalted oil (DAO) phase, the proportions of the polar solvent and the apolar solvent in the solvent mixture being adjusted according to the properties of the feedstock, according to the desired yield of asphalt and/or according to the desired quality of the DAO, the deasphalting step being conducted under the subcritical conditions for the mixture of solvents; b) hydrotreating at least part of the deasphalted oil (DAO) phase originating from step a); d) catalytically cracking at least part of effluent originating from step b) in at least one fluidized-bed reactor under conditions allowing a gasoline fraction and/or a light olefins fraction to be produced.