| abstract |
Process for hydrotreating a load from renewable sources to produce paraffinic hydrocarbons in the presence of hydrogen in excess of the theoretical hydrogen consumption and under hydrotreating conditions in a fixed-bed reactor with a plurality of catalytic zones arranged in series and comprising a catalyst of hydrotreatment, characterized in that: a) the flow of the total charge F is divided into a certain amount of different partial flows F1 to Fn equal to the number of catalytic zones n in the reactor, the first partial flow F1 is injected into the first catalytic zone, the second partial flow F2 is injected into the second catalytic zone and so on, if n is greater than 2, the different partial flows are injected into the successive catalytic zones in increasing proportions, so that F1 / F is lower or equal to F2 / F, in turn less than or equal to F3 / F, and so on until F (n-1) / F is less than or equal to Fn / F, so that the s outlet temperatures of the different zones follow an ascending profile, to produce an effluent containing paraffinic hydrocarbons, b) said effluent is subjected to at least one separation stage that allows the separation of a gaseous fraction containing hydrogen, CO, CO2, H2S , water and light gases and a liquid fraction containing paraffinic hydrocarbons, c) at least a part of said liquid fraction containing paraffinic hydrocarbons is recycled in the first catalytic zone so that the mass ratio between the flow of said recycling sent to the first catalytic zone and the partial flow F1 introduced in the first catalytic zone is greater than or equal to 10. |