Method for producing middle distillates by the...

C - Chemistry – Metallurgy – 10 – G

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C10G 45/10 (2006.01)

Patent

CA 2605400

The invention relates to a method for producing middle distillates from a paraffinic feedstock produced by Fischer-Tropsch synthesis using a hydrocracking/ hydroisomerization catalyst that comprises 0.2 to 2.5 % by weight of oxide of a doping element selected among boron, phosphorous, silicon, at least one hydro-dehydrogenating element selected from the group formed by the noble elements of group VIII of the periodic table, a non-zeolitic support based on silica-alumina containing a quantity greater than 5 % by weight and less than or equal to 95 % by weight of silica (SiO2), an average pore diameter, measured by mercury porosimetry, ranging from 20 to 140 Å, a total pore volume, measured by mercury porosimetry, ranging from 0.1 ml/g to 0.6 ml/g, a total pore volume, measured by nitrogen porosimetry, ranging from 0.1 to 0.6 ml/g, a BET specific surface area ranging form 100 to 550 m2/g, a pore volume, measured by mercury porosimetry, in the pores having a diameter greater than 140 Å and less than 0.1 ml/g, a pore volume, measured by mercury porosimetry, in the pores having a diameter greater than 160 Å less than 0.1 ml/g, a pore volume, measured by mercury porosimetry, in the pores having a diameter greater than 200 Å less than 0.1 ml/g, a pore volume, measured by mercury porosimetry, in the pores having a diameter greater than 500 Å less than 0.1 ml/g and an X-ray diffraction pattern that contains at least the principal lines characteristic of at least one of the transition aluminas contained in the group composed of the alpha, rho, chi, eta, gamma, kappa, theta and delta aluminas.

L'invention concerne un procédé de production de distillats moyens à partir d'une charge paraffinique produite par synthèse Fischer-Tropsch, utilisant un catalyseur d'hydrocraquage/hydroisomérisation qui comporte de 0,2 à 2,5 % poids d'oxyde d'un élément dopant choisi parmi bore, phosphore, silicium, au moins un élément hydro-déshydrogénant choisi dans le groupe formé par les éléments nobles du groupe VIII de la classification périodique, un support non zéolitique à base de silice- alumine contenant une quantité supérieure à 5% poids et inférieure ou égale à 95% poids de silice (SiO2), un diamètre moyen poreux, mesuré par porosimétrie mercure, compris entre 20 et 140 A, un volume poreux total, mesuré par porosimétrie mercure, compris entre 0,1 ml/g et 0,6 ml/g, un volume poreux total, mesuré par porosimétrie azote, compris entre 0,1 ml/g et 0,6 ml/g, une surface spécifique BET comprise entre 100 et 550 m2/g, un volume poreux, mesuré par porosimétrie mercure, compris dans les pores de diamètre supérieurs à 140 A inférieur à 0,1 ml/g, un volume poreux, mesuré par porosimétrie mercure, compris dans les pores de diamètre supérieurs à 160 A inférieur à 0,1 ml/g, un volume poreux, mesuré par porosimétrie mercure, compris dans les pores de diamètre supérieurs à 200 A inférieur à 0,1 ml/g, un volume poreux, mesuré par porosimétrie mercure, compris dans les pores de diamètre supérieurs à 500 A inférieur à 0,1 ml/g et un diagramme de diffraction X qui contient au moins les raies principales caractéristiques d'au moins une des alumines de transition comprise dans le groupe composé par les alumines alpha, rhô, chi, eta, gamma, kappa, thêta et delta.

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