Patent ID: 7332071

Claim:
A process for transforming a gas oil fraction that comprises: a) at least one hydrorefining stage during which the gas oil fraction is brought into contact with a catalyst, in the presence of hydrogen and at a temperature TR1, whereby said catalyst consists of: an amorphous mineral substrate, at least one metal of group VIB of the periodic table, at least one non-noble metal of group VIII, and at least one promoter element that is phosphorus, boron, silicon or fluorine, and b) at least one subsequent stage during which at least a portion of the products that are obtained from the hydrorefining stage are brought into contact in the presence of hydrogen and at a temperature TR2 with a catalyst that comprises: an amorphous mineral substrate, at least one metal of group VIB of the periodic table, at least one non-noble metal of group VIII, and, at least one promoter element that is phosphorus, boron, silicon or fluorine, or: at least one mixed oxide that is amorphous silica-aluminas, silica-alumina-titanium or silica-alumina-zirconia, at least one metal of group VIB of the periodic table, at least one non-noble metal of group VIII, and optionally a mineral binder, wherein the conversion of products that have a boiling point that is less than 150° C. is, for the hydrorefining stage, between 1 and 15% by weight, and the temperature, TR2, of the subsequent stage is less than the temperature, TR1, of the hydrorefining stage, and the variation between temperatures TR1 and TR2 is between 0 and 80° C.