Frans L. Plantenga Akzo Chemicals BV Amersfoort The Netherlands Yoshimasa Inoue, Naoyuki Torihara Nippon Ketjen Co. Ltd. Tokyo Feedstock contaminants, as well as maldistribution of oil and incorrect catalyst loading in the guard reactor, can lead to serious malperformance of hydrotreaters and hydrocrackers. However, proper liquid distribution, catalyst loading, and selection of catalyst-in particular, a novel iron and scale-removal catalyst-can improve the operation of hydroprocessing units. In the past, many resid units in Japan have been operated with heavy feeds at very high severity. High levels of contaminants...

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