| 主权项 |
1. A process for converting a high-boiling hydrocarbon feedstock into lighter boiling hydrocarbon products, said lighter boiling hydrocarbon products being suitable as feedstock for petrochemical processes, said converting process comprising:
feeding a heavy hydrocarbon feedstock to a cascade of hydrocracking unit(s). cracking said feedstock in the hydrocracking unit(s), separating said cracked feedstock into a stream comprising hydrogen, a stream comprising a light boiling hydrocarbon fraction and a bottom stream comprising a heavier hydrocarbon fraction, feeding said bottom stream of such a hydrocracking unit as a feedstock, for a subsequent hydrocracking unit in said cascade of hydrocracking unit(s), wherein process conditions in each hydrocracking unit are different from each other, in which the hydrocracking conditions from a first to subsequent hydrocracking unit(s) increase from least severe to most severe, wherein a reactor type design of the last hydrocracking unit in said cascade of hydrocracking unit(s) is of a slurry phase type, and sending the light boiling hydrocarbon fractions from each hydrocracking unit(s) to petrochemicals processes, comprising at least a gas steam cracking unit and one or more units chosen from a pentane dehydrogenation unit, a propane dehydrogenation unit, butane dehydrogenation unit and a mixed propane-butane dehydrogenation unit. |
