Studies on the Liquefaction of Coal with Carbon Monoxide and Water (II)

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Abstract
SYNOPSIS: The liquefaction of Soya Koishi coal with carbon monoxide and water was studied using an autoclave at 400°C. The yield, chemical structure and molecular weight of the product and the reaction rate were examined. The reaction behavior and mechanism of liquefaction with carbon monoxide and water were compared with that with hydrogen.The results were summarized as follows.(1) The rate of reaction with carbon monoxide and water was faster than that with hydrogen.(2) In the reaction with carbon monoxide and water, the direct production of oil from coal and the consecutive reaction of coal-Tyridine soluble-, asphaltene-oil took place in parallel. The rates of both reactions were rapid. On the other hand, in the reaction with hydrogen, the direct production of oil from coal proceeded mainly in the initial stage (up to the reaction time of 20min) and the rate was rapid. A consecutive reaction took place in the later stage and the rate was slow. It was ascertained that coal liquefaction wifn carbon monoxide and water proceeded more readily than that with hydrogen.(3) It was considered that coal liquefaction with carbon monoxide and water was due to hydrogenation with activated hydrogen produced by the water-gas shift.(4) From the results of analysis of chemical structure of reaction products, it became apparent that the main reaction in the liquefaction was the destruction of ether- oxygen-bond between the structural units. The ring-opening reaction of aromatic rings did not take place. In addition, it was found that an introduction of alkyl groups into the reaction products also took place.(5) The mean number of aromatic condensed rings of the structural unit of the main portion of Soya Koishi coal was 2-3.

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