| abstract |
The present invention relates to a process for converting a heavy hydrocarbon feedstock comprising at least 50% of a fraction having a boiling point of at least 300°C and containing sulfur, Conradson carbon residues, metals and nitrogen, the process comprising at least two successive hydroconversion steps, and at least one step of deasphalting the heavy ends of the effluent produced by the hydroconversion, the hydroconversion steps may be separated by an intermediate separation step, wherein the first hydroconversion step Downstream of the deasphalted oil (DAO) at least a portion of the deasphalted oil (DAO) is recycled in the hydroconversion process. DAO is recycled at its outlet from the deasphalted gas, or after passing through a fractionation step that produces a heavy fraction of DAO, which in turn constitutes that portion of DAO that is recycled. This method can simultaneously improve the conversion rate and the stability of the liquid effluent. |