| 摘要 |
PCT No. PCT/JP81/00134 Sec. 371 Date Sep. 23, 1982 Sec. 102(e) Date Sep. 23, 1982 PCT Filed Jun. 9, 1981 PCT Pub. No. WO82/04441 PCT Pub. Date Dec. 23, 1982.A process for hydrocracking hydrocarbons for residuum conversion in the presence of a fluidized catalyst, which is characterized by extracting at least part of the fluidized catalyst from the reaction system as a spent catalyst, subjecting at least part of the spent catalyst to hydrotreatment for solubilizing toluene-insoluble carbonaceous materials deposited on the catalyst thereby regenerating the spent catalyst, and recycling the regenerated catalyst to the hydrocracking step. According to this process, the spent catalyst is recycled to the hydrocracking step in a highly activated state after the regenerative hydrotreatment, so that it becomes possible to suppress the coke production within the reactor to a considerable degree, to maintain the coke level of the catalyst below a predetermined value and to preclude the contamination of the reactor walls with coke. The process of the invention which regenerates the spent catalyst by a hydrotreatment, in contrast to the conventional catalyst regeneration by oxidative roasting, eliminates all the difficult problems as encountered in the oxidative roasting methods.
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