Abstract
A series of experiments was conducted to examine the effectiveness of hydrogenated Athabasca bitumen for the liquefaction of an Alberta subbituminous coal. Hydrogenated bitumens were prepared by treatment with hydrogen and an alumina supported Ni/Mo catalyst under a variety of process conditions. Bitumen hydrogenated at 440 °C was shown to be a better coal liquefaction solvent, both in terms of coal conversion and distillate yields, than bitumen hydrogenated at 400 °C. Over 90 wt% of an Alberta subbituminous coal was solubilized at 440 °C using a 30 min residence time and a hydrogen pressure of 6.9 MPa in bitumen solvent that had been prepared by hydrogenation at 440 °C. Of the 72 wt% (based on total feed) distillate obtained from this experiment, 76% boiled below 343 °C and had S and N contents of 860 and 2300 ppm, respectively. Coal solubilization temperature was shown to have a significant effect on coal conversion.
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