| abstract |
The invention concerns an improved process for producing very high quality base stock and for simultaneously producing high quality middle distillates, comprising successive hydroisomerisation and catalytic dewaxing steps. n Hydroisomerisation is carried out in the presence of a catalyst containing at least one noble metal deposited on an amorphous acidic support, the dispersion of the metal being 20%-100%. The support is preferably an amorphous silica-alumina. n Catalytic dewaxing is carried out in the presence of a catalyst containing at least one hydrodehydrogenating element (group VIII) and at least one molecular sieve selected from ZBM-30, EU-2 and EU-11. |