Patent ID: 7655136
Filing Date: 2010-02-02
Classification: B01J,C10G

Abstract:
1. In a process for producing middle distillates, comprising contacting a paraffinic feed under sufficient catalytic hydrocracking and hydroisomerization conditions so as to produce said middle distillates, said paraffinic feed comprising a cut produced directly or indirectly by Fischer-Tropsch synthesis, the catalyst being a hydrocracking/hydroisomerization catalyst comprising: at least one hydrodehydrogenating element selected from elements from group VIB and group VIII of the periodic table; and a non-zeolitic support comprising alumina-silica; said alumina-silica having the following characteristics: the improvement wherein said catalyst comprises 0.01% by weight to 6% by weight of P 2 O 5 as a doping element, and wherein the concentration of P 2 O 5 as a doping element is sufficient to provide an increased yield of middle distillate compared to the same catalysts having a content of P 2 O 5 below 0.01% by weight and above 6% by weight.