| 摘要 |
The present invention is a catalytic hydrocracking process which minimizes the fouling of the process unit with 11+ ring heavy polynuclear aromatic compounds by means of hydrogenating and converting at least a portion or slipstream of the hydrocarbon effluent from the hydrocracking zone containing trace quantities of 11+ ring heavy polynuclear aromatic compounds in a 11+ ring heavy polynuclear aromatic compound conversion zone containing a hydrogenation catalyst having a hydrogenation component at hydrogenation conditions to selectively reduce the concentration of 11+ ring heavy polynuclear aromatic compounds before the hydrocracking zone effluent is cooled below about 400 DEG F. At least a portion of the effluent from the 11+ ring heavy polynuclear aromatic compound conversion zone is cooled and separated to produce at least a portion of the unconverted recycle stream.
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