Patent ID: 8845881
Filing Date: 2014-09-30
Classification: C10G

Abstract:
1. A process for the production of middle distillates from a paraffinic feedstock that is produced by Fischer-Tropsch synthesis, comprising contacting said feedstock with a hydrocracking/hydro-isomerization catalyst that comprises at least one hydro-dehydrogenating metal of group VIB or group VIII of the periodic table, and a substrate that comprises at least one zeolite that has at least one series of channels whose opening is defined by a ring with 12 oxygen atoms, said catalyst having been modified before combination with a matrix by a) introducing at least one alkaline cation of group IA or IIA of the periodic table, b) depositing on inside and outside surfaces of said zeolite at least one molecular compound that contains at least one silicon atom, c) at least one partial exchanging of said alkaline cations by NH 4 + cations such that the content of alkaline cations remaining in the modified zeolite at the end of c) is such that the alkaline cation/aluminum molar ratio is between 0.2:1 and 0.01:1, and d) at least one heat treatment.