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A bituminous coal liquefaction process, called the NEDOL process, is under development by the New Energy and Industrial Technology Development Organization (NEDO). Important features of this process include the capacity to produce hydrogen-donatable solvents, obtained by hydrogenation of middle distillates of coal derived oils, and to recycle these solvents to a liquefaction stage as hydrogen-donatable solvents. The following items have been investigated in this study: (1) comparison of the hydrogenation reactivity of the recycled solvents derived from Illinois No. 6, Battle River, and Wandoan coals, obtained from a 1t/day PDU; (2) characteristics changes of the solvents during storage and the influence of catalytic activities on hydrogenation; (3) a comparision of catalyst performance on hydrogenation between newly developed and commercial catalysts, based on the result of storage stability test. Results indicated that the hydrotreating test of recycled solvents can be sufficiently performed at milder conditions using the newly developed catalyst. Further, since it was found that plugging was the primary cause of catalyst deactivation, varying the catalyst pore size was studied. The catalyst life was improved by enlarging the size of pore.

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Studies on Catalytic Hydrotreating of Recycled Solvents from Coal Liquefaction Process(Part 3) Investigation of Storage Stabilities of Recycled Solvents.