Patent ID: 7381321

Claim:
A process for transforming a gas oil fraction, said process comprising: at least one hydrorefining stage during which a gas oil fraction having an initial boiling point of at least 180° C. and a final boiling point of at most 370° C. is brought into contact with a catalyst, in the presence of hydrogen and at a temperature TR1, whereby said catalyst 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 of the periodic table, and at least one promoter element that is ef phosphorus, boron, silicon or fluorine, and b) at least one subsequent hydrocracking stage during which at least a portion of the products that are obtained from the hydrorefining stage are brought into contact with a catalyst in the presence of hydrogen and at a temperature TR2, whereby said catalyst comprises: at least one Y zeolite of FAU structure, an NU-86 zeolite or a beta zeolite of BEA structure, a mineral binder, and at least one non-noble metal of group VIII, wherein the conversion of products that have a boiling point that is less than 150° C. is, throughout the two stages of hydrocracking and hydrorefining, less than 40% by weight and, for the hydrorefining stage, between 1 and 15% by weight, and in that the temperature, TR2, of the hydrocracking stage, is less than the temperature, TR1, of the hydrorefining stage, and in that the variation between temperatures TR1 and TR2 is between 5 and 70° C.