The detailed compositional analysis was performed by combining HPLC separation with GC and FIMS analysis. Raw coal liquids contained a large amount of polyaromatics and polars, and almost of them were hydrogenated to saturats and monoaromatics after the primary upgrading. The secondary upgrading of kerosene/gas oil fraction provided coal-derived diesel fuel which were composed of dicyclic (43-44%) and tricyclic (25-31%) naphthenes, and acyclic paraffins (12-14%).

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A biobriquette made by mixing low grade chinese coal and larch bark with Ca(OH)_2 as a desulphization agent was pyrolyzed up to 1173K in nitrogen and gasified with steam at 1173K to measure the gaseous sulfur evolution. H_2S removal depression by biobriquette were more effective at pyrolyzed. period than gasigied process.

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The effects of the cooling and/or air exposure of coal char on the gasification reactivity of the char were investigated in a fixed-bed flow reactor under some temperatures. The cooling was found to be the main respect degrading the gasification reactivity of the char. The results of TPD experiment show that the reactivity degradation could be attributed to the decrease in active sites of the char.

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