| 摘要 |
FIELD: petroleum processing. ^ SUBSTANCE: at least part of heavy feed is supplied to deasphalting section in presence of hydrocarbon solvents to form two streams, of which one stream is composed of deasphalted petroleum products and the other of asphalts. The latter is mixed with hydrogenation catalyst and optionally with the rest of heavy feed not directed to deasphalting section. Resulting mixture is fed to hydrofining reactor, to which also hydrogen or H2/H2S mixture is supplied. Stream containing hydrofining reaction product and dispersed catalyst is routed to one or more distillation or evaporation stages, by means of which most volatile fractions, including hydrofining gases, are separated. At least 60 wt % of bottom residue (goudron) or liquid leaving evaporation unit containing dispersed catalyst, sulfide-rich metals obtained in feed demetallization stage, and optionally coke is recycled to deasphalting zone. ^ EFFECT: simplified technology. ^ 11 cl, 2 dwg, 4 tbl, 3 ex |
