METHOD FOR PRODUCING MIDDLE DISTILLATES BY HYDROISOMERISATION AND HYDROCRACKING OF A HEAVY FRACTION FROM A FISCHER-TROPSCH EFFLUENT

摘要

The invention relates to a method in which the paraffin effluent from a Fischer-Tropsch synthesis unit is separated in order to obtain a C5+ heavy fraction, said heavy fraction being then hydrogenated in the presence of a hydrogenation catalyst at a temperature of between 100°C and 180°C, at a global pressure of between 0.5 and 6 MPa, at an hourly volumetric rate of between 1 and 10h-1, and at a hydrogen flow rate corresponding to a volumetric hydrogen/hydrocarbon ratio of between 5 and 80 Nl/l/h, the liquid hydrogenated effluent being then contacted with a hydroisomerisation / hydrocracking catalyst without any preliminary separation step, the hydroisomerised/hydrocracked effluent being then distilled for obtaining the middle distillates and optionally oil bases.