| 摘要 |
The process for the conversion of a heavy hydrocarbon fraction with a Conradson C content of at least 10, a minimum metal content of 50 ppm, asphaltic C7s at least 1% and S at least 0.5%, is affected by the following stages :- (a) treatment of the charge in a hydroconversion stage in the presence of H2, comprising a triphase reactor containing a hydroconversion catalyst in a fluidised bed, functioning in ascending liquid-gas current with means for withdrawal and supply of fresh catalyst, in conditions giving a liquid charge with reduced Conradson C , metals and sulphur ; (b) part of the hydroconverted liquid effluent from (a) is sent to a an atmospheric distillation zone from which a distillate and residue are obtained ; (c) part of the residue from (b) is sent to a vacuum distillation zone from which a vacuum distillate and a vacuum residue are obtained ; (d) part of the vacuum residue from (c) is de-asphalted by solvent extraction to give a de-asphalted hydrocarbon cut and residual asphalt ; and (e) part of the de-asphalted cut from (d) is hydro-treated in the presence of H2 giving products of reduced Conradson C , metal and sulphur contents and after separation a gaseous, fuel and heavy liquid fractions : the unit comprises a triphasic reactor functioning as in (a) with a hydro-treatment catalyst in a fluidised bed.
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