Improved process of production of base oils and middle distillates with a conversion-hydroisomerization followed by catalytic dewaxing.

摘要

Process for the production of oils from a hydrocarbon charge, said process comprising the following successive steps: (a) conversion of the charge with simultaneous hydroisomerization of at least part of the n-paraffins of the load, said loads a sulfur content less than 1,000 ppm by weight, a nitrogen content of less than 200 ppm by weight, containing less metal to 50 ppm by weight and an oxygen content of at most 0, 2%, developing said step a a temperature of 200-500 under a pressure of 2-25 MPa, with a space velocity of 0, 1 to 10 h-1 in the presence of hydrogen and in the presence of a catalyst containing at least one noble metal deposited on a amorphous acid support, the noble metal dispersion being between 20 and 100%; (B) catalytic dewaxing of at least part of the effluent from step (a), conducted at a temperature of 200-500 under a pressure of 1-25 MPa, with an hourly volumetric flow rate of 0, 05-50 h -1,