Hydrocracking of Miike Coal Extract

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Miike coal extract was catalytically hydrotreated at 340-460°C, 0-90 min, 4.9-12.8 MPa (hydrogen initial pressure) in a batch autoclave.Sulfur and Nitrogen removal and yield (gas+oil+BS) were related to the experimental conditions.As expected, sulfur and nitrogen removal increased with reaction parameters, but nitrogen elimination was 46% at the most as compared with 70% of sulfur removal.Yield also increased, but had a tendency to decline by repolymerization of reaction product after the optimal condition.At the most severe condition, 460°C, 60 min, thermal cracking became predominant and total gas yield came up to 26%, then yield (gas+oil+BS) ostensibly increased again.Thus the reaction behavior was a little complicated in the absense of solvent.Optimal hydrotreating removed 70% of the sulfur and 34% of the nitrogen at 400°C, 30 min or 380°C, 60 min, then yield (gas+oil+benzene soluble part) was 79%.
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