PROCESS FOR PRODUCTION OF MIDDLE DISTILLATE FROM CONVENTIONAL HEAVY FEEDSTOCK INCLUDING STEP FOR SELECTIVE HYDROGENATION OF EX FCC HCO CUT

摘要

FIELD: chemistry.;SUBSTANCE: invention relates to a method of converting heavy hydrocarbon feedstock. Method uses catalytic cracking unit (FCC – fluid catalytic cracking), followed by one or more units for selective hydrogenation. In method feedstock for selective hydrogenation of unit consists of heavy distillate fraction, coming out of FCC, called HCO fraction, consisting of triaromatic compounds more than 60 wt% and characterised by a boiling point in range of 320 °C to 490 °C, preferably, 360 °C to 440 °C. Selectively processed HCO fraction is re-fed into reaction zone of FCC unit. Selective hydrogenation unit operates at pressure from 15 to 50 bar and at temperature ranging from 325 °C to 360 °C in presence of a hydrotreatment catalyst, containing from 1 to 10 wt% nickel, preferably, from 1 to 5 wt% nickel (expressed on nickel oxide NiO) in combination with 1–30 wt% molybdenum, preferably, 5–20 wt% molybdenum (expressed on molybdenum oxide MoO₃) on a substrate of aluminium oxide.;EFFECT: technical result: improvement of efficiency and selectivity on middle distillate.;6 cl, 1 dwg, 3 ex, 8 tbl