Patent ID: 6127299
Filing Date: 2000-10-03
Classification: B01J,C10G

Abstract:
A process for preparing a catalyst which is suitable for the hydroprocessing of heavy hydrocarbon feeds and comprises 0.01-0.12 mole of Group VI hydrogenation metal comprising one or both of molybdenum and tungsten per 100 grams catalyst and 0.004-0.08 mole of Group VIII hydrogenation metal comprising one or both of nickel and cobalt per 100 grams catalyst on a refractory oxide carrier, which process comprises the steps of(i) subjecting a used hydroprocessing catalyst containing carbonaceous and sulfurous deposits to a thermal treatment in an oxygen-containing atmosphere at a temperature of 300-600.degree. C. for a period of 0.1-48 hours to remove carbonaceous and sulfurous deposits, with the used hydroprocessing catalyst comprising a Group VI hydrogenation metal component comprising one or both of molybdenum and tungsten and a Group VIII hydrogenation metal component comprising one or both of nickel and cobalt on a refractory oxide carrier,(ii) grinding the material obtained in step (i),(iii) mixing the ground material obtained in step (ii) with a binder and, optionally, one or more additives, and(iv) shaping the mixture to form a new catalyst, followed by drying and calcination, wherein the thermal treatment of step (i) is conducted prior to grinding of the used hydro processing catalyst, and wherein the loss on ignition of the catalyst composition mixture at any point in the steps (ii), (iii), and (iv) is not higher than 70%.