Hiroki Koyama, Eiichi Nagai, Hidenobu Torii, Hideaki KumagaiJapan Energy Corp. Kurashiki, Okayama, Japan In response to problems experienced in its resid hydrodesulfurization (HDS) unit, Japan Energy Corp. conducted commercial trials involving several operational changes. These changes solved the problems of pressure-drop increase, catalyst deactivation, and formation of hot spots in the catalyst bed. Part 1 of this series described the unit's operating problems and the cold-flow model tests that evaluated potential solutions (OGJ,Nov. 13, p. 82). This article concludes the series by describing the effects of the courses of action taken in the resid HDS unit. COMMERCIAL TRIA...

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