Hiroki Koyama, Eiichi Nagai, Hidenobu Torii, Hideaki Kumagai Japan Energy Corp. Kurashiki, Okayama, Japan In commercial trials at its Mizushima, Japan, refinery, Japan Energy Corp. found that improved liquid distribution in the resid desulfurization unit catalyst bed prevented the formation of hot spots. In addition, use of an appropriate catalyst combination prevented pressure-drop increase. Results of other testing indicated that controlling the residue conversion in each bed may minimize coke deactivation in the last bed. These solutions have enabled Japan Energy to maximize catalyst utilization in the fixed-bed reactor system and to increase cycle length to 6 months. This fir...

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