Process for the conversion of heavy charges such as heavy crude oils and distillation residues

摘要

A process for converting a heavy charge such as a heavy crude oil, a tar from oil sand and a distillation residue, by combining a hydroconversion with catalysts in slurry phase process, a distillation or flash process, and a deasphalting process, wherein the three processes operate on mixed streams consisting of fresh charge and recycled streams.

主权项

1. A process for the conversion of heavy charges selected from heavy crude oils, distillation residues, “heavy oils coming from catalytic treatment, “thermal tars”, tars from oil sands, various kinds of coals and other high-boiling charges of a hydrocarbon origin known as “black oils”, by the combined use of the following three process units: hydroconversion with catalysts in slurry phase (HT), distillation or flash (D), deasphalting (SDA), characterized in that the three units operate on mixed streams consisting of fresh charge and recycled streams, with the use of the following steps:
sending at least one fraction of the heavy charge to a deasphalting section (SDA) in the presence of hydrocarbon solvents obtaining two streams, one consisting of deasphalted oil (DAO), the other of asphalts; mixing the asphalt with a suitable hydrogenation catalyst and with the remaining fraction of the heavy charge not sent to the deasphalting section and sending the mixture obtained to a hydro-treatment reactor (HT) into which hydrogen or a mixture of hydrogen and H2S is charged; sending the stream containing the hydro-treatment reaction product and the catalyst in dispersed phase to one or more distillation or flash steps (D) whereby the most volatile fractions are separated, among which the gases produced in the hydro-treatment reaction; recycling at least 60% by weight of the distillation residue (tar) or liquid leaving the flash unit, containing the catalyst in dispersed phase, rich in metallic sulfides produced by demetallation of the heavy charge, to the deasphalting zone.