A high activity hydrodesulfurization catalyst, a method of...

B - Operations – Transporting – 01 – J

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B01J 21/04 (2006.01) B01J 23/75 (2006.01) B01J 23/755 (2006.01) B01J 23/85 (2006.01) B01J 27/18 (2006.01) C10G 45/04 (2006.01)

Patent

CA 2580451

A method of making a high activity catalyst composition suitable for use in the hydrodesulfurization of a middle distillate feed, such as diesel fuel, having a high concentration of sulfur, to thereby provide a low sulfur middle distillate product. The method comprises heat treating aluminum hydroxide under controlled temperature conditions thereby converting said aluminum hydroxide to gamma-alumina to give a converted aluminum hydroxide, and controlling the fraction of said converted aluminum hydroxide that is gamma- alumina by controlling said controlled temperature conditions to within a calcination temperature range of from 850 ~F (454 ~C) to 950 ~F(510 ~C) so that essentially all of said aluminum hydroxide is converted to a transition alumina but less than a material amount of the converted aluminum hydroxide is converted to a transition alumina other than gamma-alumina. A catalytic component is incorporated into said converted aluminum hydroxide to provide an intermediate, which is heat treated to provide said high activity catalyst composition.

L'invention concerne un procédé de fabrication d'une composition de catalyseur de haute activité, utilisé dans l'hydrodésulfuration d'une charge de distillat moyen, tel que le carburant diesel, qui présente une concentration élevée en soufre, pour obtenir un produit de distillat moyen à faible teneur en soufre. Ce procédé consiste d'abord à thermotraiter l'hydroxyde d'aluminium dans des conditions de température contrôlée afin de transformer ledit hydroxyde d'aluminium en alumine-gamma et obtenir ainsi un hydroxyde d'aluminium transformé; et à contrôler ensuite la fraction dudit hydroxyde d'aluminium transformé, c.-à-d. l'alumine-gamma, en maîtrisant les conditions de température contrôlée dans une plage de température de calcination comprise entre 850 °F (454 °C) et 950 °F( 510°C) de sorte que sensiblement tout l'hydroxyde d'aluminium soit transformé en aluminium de transition mais qu'une quantité de matière inférieure à l'hydroxyde d'aluminium transformé soit transformée en alumine de transition autre que l'alumine-gamma. Par ailleurs, un composant catalytique est incorporé à l'hydroxyde d'aluminium transformé pour former un intermédiaire, lequel est thermotraité pour obtenir ladite composition de catalyseur à haute activité.

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