Tetrahydroquinoline hydrogen donor

Pyrite has been shown to catalyze the hydrogenation of quinoline to tetrahydroquinoline (THQ) at 325°C and a 30 minute residence time (19). It has been known that THQ is a good hydrogen donor solvent for coal liquefaction (13). In experiments with Kentucky coal and quinoline, it was found that pyrite was required to maintain a sufficient concentration of THQ and prevent retrogressive reactions (19). It appears, therefore, that pyrite catalyzes the in situ regeneration of hydrogen donors, and allows more efficient hydrogen uptake from the gas phase to the solvent at lower temperatures than would be possible in the absence of pyrite. 

A method developed by the Kyushu Industrial Research lnstitute(known as Kyukoshi in Japan), utilized hydrogenation of a coal tar pitch, which was first de-ashed, followed by distillation as required and then hydrogenated in the presence of a hydrogen donor solvent such as tetrahydroquinoline ... 

In one of the methods developed in the Kyushu Industrial Research Institute, the feed pitch is first de-ashed and distilled and then subjected to hydrogenation using hydrogen-donor solvents, such as tetrahydroquinoline, and hydrogen gas as a catalyst. The hydrogenated pitch is filtered to remove the hydrogenation catalyst and then heated, to remove the low temperature volatile matter, which is... 

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