Patent ID: 7872165

Claim:
A method of hydrotreating a feed comprising a mixture consisting of an oil of vegetable or animal origin (1 to 99% by volume) and of a petroleum cut (99 to 1% by volume) so as to obtain a fuel base at least containing less than 50 mg/kg sulfur, said process comprising: a) a first hydrotreatment stage in a fixed-bed reactor HDT 1 with at least one catalyst at a temperature of 180° C. to 360° C., a total pressure of 0.5 to 20 MPa, an hourly space velocity of 0.1 to 20 h −1 and in the presence of 50 to 2000 Nl hydrogen per liter of feed, b) an intermediate stripping stage to eliminate carbon monoxide (CO), carbon dioxide (CO 2 ), water (H 2 O), hydrogen sulfide (H 2 S) and ammonia (NH 3 ) formed during the first hydrotreatment stage, c) a second hydrotreatment stage in a fixed-bed reactor HDS 2 with at least one catalyst at a temperature of 180° C. to 450° C., a total pressure of 0.5 to 30 MPa, an hourly space velocity of 0.1 to 20 h −1 and in the presence of 50 to 2000 Nl hydrogen per liter of feed; wherein the first hydrotreatment stage (a) is conducted at a lower temperature that the second hydrotreatment stage (c).