METHOD OF PRODUCING MIDDLE DISTILLATES BY HYDROISOMERIZATION AND HYDRO­CRACKING OF FEEDSTOCKS COMING FROM THE FISCHER-TROPSCH PROCESS

摘要

The invention relates to a method of producing middle distillates from a paraffinic feedstock produced by Fischer-Tropsch synthesis, employing a hydroisomerization/hydrocracking catalyst comprising at least one hydro-dehydrogenating metal chosen from the group formed by the metals of group VIB and group VIII of the Periodic Table and a support comprising at least one silica-alumina and at least one zeolite chosen from the group formed by TON, FER and MTT structural zeolites and ZBM-30, ZSM-48 and COK-7 zeolites taken individually or as a mixture, said method operating at a temperature between 270 and 400°C, with a pressure of between 1 and 9 MPa, a space velocity of between 0.5 and 5 h-1 and a hydrogen flow rate adjusted so as to obtain a ratio of 400 to 1500 normal litres of hydrogen per litre of feedstock.