The Thermal Decomposition of Coal in Hydrogen Under Pressure

概要

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Coal was decomposed thermally in pressurized nitrogen and hydrogen atmosphere to examine the effect of hydrogen on the decomposition. The thermal decomposition of coal was measured by thermogravimetry from room temperature to 900°C under the pressure of 1, 25 and 70 atm.<BR>To obtain more detailed information products of the decomposition at 600°C under the pressure between 1 and 125 atm. were examined. The yield of the carbonization products was determined from their weight. The moleculer weight of the produced tar was measured by the method of melting point depression and the amount of the low boiling material of the tar was analysed by gaschromatography. Gas analysis was also applied on the produced gas.<BR>In the thermogravimetry, it was shown that hydrogen had the effect above 500°C, and that the increase of volatile substance at 600°C was 10-15%. From the measurement of the yield and the analysis of the decomposition products, it was also shown that the yield of coke reduced and that of tar and gas increased, and the amount of methane in the produced gas increased remarkablly, in addition, the lower moleculer substances increased remarkablly, in addition, the lower moleculer substances increased in the produced tar.<BR>From these results, the possibility of pressurized hydrogasfication of coal was suggested.
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