METHOD FOR PRODUCING middle distillates hydroisomerization and hydrocracking of heavy fractions of the products produced by the process Fischer-Tropsch

摘要

1. A method for producing middle distillates from a paraffinic load obtained by Fischer-Tropsch synthesis comprising the following successive steps: a) separation of at least one light fraction boot sole to obtain the so-called heavy fraction with an initial boiling point component 120-200 ° C, b) may hydrotreating said heavy fraction, optionally followed by step (c) removing at least a portion of the water, d) passing at least a portion of said fraction, optionally hydrotreated, through amorphous hydroisomerization catalyst / hydrocracking, and this catalyst conversion products with boiling points above or equal to 370 ° C into products with boiling points below 370 ° C, greater than 80 wt.%, e) distilling hydrocracked / hydroisomerized fractions to obtain middle distillates, and returning to step d ) of the residual fraction boiling above said middle distillyatov.2. A method according to claim 1 in which said light fraction separated and carried on a steam kreking.3. A method according to claim 1 or 2, wherein at least one of kerosene fractions, gas oil of step (e) is partially recycled to step (d) .4. A method according to claim 3, wherein the catalyst phase (d) does not contain additional galogena.5. A method according to claim 4, wherein the catalyst phase (d) is not ftorirovan.6. Installation for producing middle distillates comprising at least one fractionation zone boot produced in a Fischer-Tropsch synthesis, having at least one inlet for input loading, at least one outlet for removing a heavy fraction with an initial boiling point equal to a temperature of 120-200 ° C, and at least one outlet for removing at least one lighter fraction than said heavy fraction, optionally at least one hydrotreatment zone provided with one line for entering the heavy fraction, at least one zone containing a hydrocracking catalyst / hydroisomerisation provided with one connection for inputting at least a portion of the heavy fraction, optionally hydrotreated, the at least one distillation column provided with nozzles for discharging middle distillates and a nozzle for discharging a residual fraction boiling above the middle distillates, at least one line for recycling the residual fraction to the zone containing the catalyst hydrocracking / hydroisomerization of at least one input line for the light fraction in the steam krekinga.7 . Apparatus according to claim 6, comprising at least one line for recycling part of the middle distillyatov.8. Installation according to one of claims 6 or 7, comprising a water separating zone located between zones hydrotreating and hydrocracking / hydroisomerization.