A procedure for the production of diesel oil with a low sulfur content, fuel-oil with a low content in sulfur and hydrocarbons c1-c4. (Machine-translation by Google Translate, not legally binding)

摘要

A process for the production of diesel oil with a low sulfur content, fuel oil with a low sulfur content and C1-C4 hydrocarbons, which procedure consists of: (a) contacting a hydrocarbon liquid filler material, containing sulfur, and hydrogen, in a hydrodesulfurization zone, with a hydrodesulfurization catalyst under conditions suitable for effecting the reduction of the sulfur content of said filler material, these conditions being such that practically all the components that boil under the diesel oil remain in a vapor state, (b) passing said steam from said hydrodesulfurization zone as the first vaporized effluent to a hydrocracking zone, (c) contacting said first vaporized effluent, in said hydrocracking zone, with a hydrocracking catalyst under conditions suitable for effecting the conversion of said vaporized effluent into hydrocarbons boiling below the gasoline range, said conditions comprising in the step (c), a reaction temperature lower by 50-150ºF (27.8-83.5ºC) than the temperature of step (a), (d) recover a fraction of hydrocarbons and lighter ones from the effluent from the hydrocracking zone, (e) recovering a fraction of hydrocarbons and lighter ones from the liquid effluent from the hydrodesulfurization zone, (f) separating the remaining liquid effluents from steps (d) and (e) into fractions comprising: (i) a fraction of gasoline, (ii) a diesel oil fraction with a sulfur content substantially lower than that of the diesel oil fraction of the filler and (iii) a fuel oil fraction with a sulfur content substantially lower than that of the fuel oil fraction of the filler material and (g) passing said fraction of gasoline to stage (a) or stage (c) as feed thereof. (Machine-translation by Google Translate, not legally binding)