Effects of moisture content on liquefaction of victorian brown coal.

概要

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Since Victorian brown coal contains about 60wt.% moisture, it is necessary to remove the water from the coal before liquefaction. The effects of mois-ture content on liquefaction of the coal dewatered in a recycling solvent (DW-coal) were studied using an autoclave with iron oxide/sulfur catalyst under the following conditions: temperature of 430°C, initial hydrogen pressure of 6MPa and hold time of 1h. When moisture content of the coal decreased, distillate (b.p.<420°C) yield and H2 gas consumption increased, and heavy product (b.p.>420°C) and naphtha (b.p.<180°C) yields decreased. Gaseous product yields and reaction pressure also de-pended on the moisture content of the coal. Specifically CO/CO2 ratio was strongly affected by the moisture content, which indicated that CO shift reaction occurred and affected the H2 gas consumption. The coal dried with a tubular dryer (TD-coal) was liquefied under the same con-ditions as the DW-coal to compare the coals in reactivity. The reactivity of the TD-coal was lower than that of the DW-coal. According to these results, it is shown that the dewatering in the solvent is profitable for brown coal liquefaction.
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