Formation and secondary decomposition of n-paraffins in coal liquefaction.

概要

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Coal liquefaction has been performed in tetralin with hematitesulfur catalyst to clarify the relation between the formation of n-paraffins and the reaction temperature. The yield of C4-C30 n-paraffins in the liquid product has been determined by using a gas chromatograph. In the case of Wandoan coal the yield of n-araffins increased with an increase of the reaction temperature and reached to 4.5 wt% (maf) at 450°C, while the secondary decomposition of n-araffins was observed at rather higher temperature. Comparing the yields of nparaffins between the reactions of seven coals, both Wandoan coal and Taiheiyo coal gave the highest value and Illinois No.6 coal the lowest. The cracking of eicosane, C20 n-paraffin, in tetralin or 1-methylnaphthalene has been investigated in the presence or absence of coal. In the case of no solvent, the cracking was observed at temperatures over 400°C and the value of its conversion reached to 70% at the temperature of 450°C, while in the case of using solvent the conversion of eicosane at 450°C was less than 20%. The effect of coal and hematite-sulfur catalyst on the conversion of eicosane was very small in the presence of tetralin.
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