Patent ID: 7250107

Claim:
A process for the production of oils and middle distillates from a charge containing more than 200 ppm by weight of nitrogen and more than 500 ppm by weight of sulphur, of which at least 20% by volume boils above 340° C., the charge comprises vacuum distillates produced by direct distillation of the crude or conversion units, hydrocracking residues, vacuum distillates produced by desulphuration or hydroconversion of atmospheric residues or vacuum residues; deasphalted oils or mixtures of these, comprising the following stages: (a) hydrorefining of the charge at a maximum conversion rate of 60% by weight, carried out at a temperature of 330° C.–450° C., under a pressure of 5–25 MPa, at a spatial velocity of 0.1–10h −1 , in the presence of hydrogen in the hydrogen/hydrocarbon volume ratio of 100–2000, in the presence of a catalyst consisting essentially of an amorphous support, at least one non-noble metal of Group VIII and at least one metal of Group VIB, and at least one doping element selected from phosphorus, boron and silicon, to effect hydro-denitrogenation, hydrodesulfuration, and hydrogenation of aromatics and cracking (b) from the effluent obtained in stage (a), separation of the gases followed by separation of the compounds with a boiling point below 150° C., and subjecting the fraction boiling above 150° C. to distillation to obtain a fraction having an initial boiling point above 340° C., (c) catalytic dewaxing of at least part of the fraction from stage (b), having an initial boiling point above 340° C., carried out at a temperature of 200–500° C., under a total pressure of 1–25 MPa, at an hourly space velocity of 0.05–50 h −1 , with 50–2000 l of hydrogen/l of charge, and in the presence of a catalyst comprising at least one hydro-dehydrogenating element and at least one molecular sieve, (d) hydrofinishing of at least part of the effluent from stage (c), carried out at a temperature of 180–400° C., under a pressure of 1–25 MPa, at an hourly space velocity of 0.05–100 h −1 , in the presence of 50–2000 l of hydrogen/l of charge, and in the presence of a hydrofinishing catalyst comprising an amorphous carrier, at least one hydro-dehydrogenating metal and at least one halogen, (e) separation of the effluent obtained in stage (d) to obtain at least one oil fraction.