Patent ID: 8968554
Filing Date: 2015-03-03
Classification: C07C,C10G

Abstract:
1. A process for converting a heavy hydrocarbon feedstock having improved selectivity for middle distillate (LCO) with a distillation range in the range 220° C. to 360° C. comprising: cracking a feedstock using a catalytic cracking unit (FCC) to obtain a heavy distillate cut (HCO), wherein said (HCO) comprises triaromatics in an amount of more than 60% by weight, and has a distillation range of 320° C. to 490° C., selectively hydrogenating said HCO with at least one selective hydrogenation unit, reintroducing said HCO cut into a reaction zone of the FCC unit, wherein the at least one selective hydrogenation unit is operated at a pressure of 15 to 50 bar, and at a temperature of 325° C. to 360° C. and in the presence of a hydrotreatment catalyst comprising 1% to 10% by weight of nickel, associated with 1% to 30% by weight of molybdenum, on an alumina support; and wherein the catalytic cracking unit (FCC) comprises: two distinct upflow reactors comprising a first processing of the heavy hydrocarbon feedstock under the following conditions: reactor outlet temperature (ROT1) in the range 450° C. to 650° C., and a C/O ratio in the range 2 to 20 and a second processing of the hydrotreated heavy distillate cut (HCO) under the following conditions: reactor outlet temperature (ROT2) in the range 500° C. to 600° C., a C/O ratio in the range 2 to 20 and, wherein the process results in a lower concentration of LPG than HCO.