Patent ID: 8581014

Claim:
A process for producing a hydrocarbon fraction, comprising: hydrotreating a mixture of biological origin comprising esters of fatty acids and, optionally, free fatty acids, in the presence of a catalytic composition comprising: A) an amorphous support of acidic nature selected from the group consisting of: (1) an amorphous silica-alumina having a SiO 2 /Al 2 O 3 molar ratio greater or equal to 5, and (2) a porous solid material comprising silicon, aluminum, phosphorus and oxygen bonded together so as to form an amorphous mixed oxide constituting a single phase, having a Si/Al atomic ratio of from 15 to 250, a P/Al ratio of from 0.1 to 5, a total pore volume of from 0.5 to 2.0 ml/g, an average pore diameter of from 3 nm to 40 nm and a specific surface area of from 200 to 1,000; and B) a metallic component comprising at least one metal of group VIII, optionally, in admixture with at least one metal of group VIB, wherein the catalytic composition, when formed by the amorphous silica-alumina (1) and Pt, is pretreated with a hydrocarbon comprising from 7 to 16 carbon atoms, when the amorphous silica-alumina (1) is a completely amorphous, micro-mesoporous silica-alumina (1a) having a SiO 2 /Al 2 O 3 molar ratio of from 30 to 500, a surface area greater than 500 m 2 /g, a pore volume of from 0.3 to 1.3 ml/g, and an average pore diameter smaller than 40 Å, and wherein, in the hydrotreating, hydrogenation, deoxygenation, and isomerization of the mixture of biological origin is conducted contemporaneous in one step.