PROCESS FOR PRODUCING MEDIUM DISTILLATE FROM FISCHER TROPSCH WAXES USING ZEOLITHE CATALYST MODIFIED BY BASIC TREATMENT

摘要

The present invention describes a process for producing middle distillates from a paraffinic feedstock produced by Fischer-Tropsch synthesis, using a hydrocracking / hydroisomerization catalyst comprising at least one hydro-dehydrogenating metal chosen from the group formed by metals. of group VIB and group VIII of the periodic table and a support comprising at least one dealuminated Y zeolite having an initial overall silicon to aluminum atomic ratio of between 2.5 and 20, a weight fraction of extra-lattice aluminum atom initial concentration greater than 10%, based on the total mass of aluminum present in the zeolite, an initial mesoporous volume measured by nitrogen porosimetry greater than 0.07 ml.g-1, and an initial crystalline parameter a0 of the elemental mesh between 24.38 Å and 24.30 Å, said zeolite being modified by a) a basic treatment step consisting of mixing said dealuminated Y zeolite with a basic aqueous solution, and at least one c) heat treatment step.