Improved process for converting a heavy charge into middle distillates using a chain of hydrocracking units, catalytic cracking of naphtha and oligomerization

摘要

The present invention relates to a process for the production of middle distillates comprising a hydrotreatment step followed by the hydrocracking of a VGO type hydrocarbon feed, separation of the effluent from the hydrocracking step, and the dispatch separate light effluent having a final boiling point below 250 ° C in an olefin production stage, that is to say a stage of NCC or catalytic cracking of naphthas. At least part of the effluent from the olefin production step is then sent to an oligomerization step followed by an olefin hydrogenation step obtained to produce middle distillates. Figure 1 to be published