Abstract
A new method is proposed to obtain oil from coal under mild reaction conditions. This method consists of coal anionization by molten potassium metal under refluxing THF with the aid of ultrasonic energy and alkylation of the coal anion by alkyl iodide. Butylated and ethylated Yubari coals, prepared by 6 h of anionization time with 1.33 potassium to coal (weight) ratio, gave oil (n-hexane soluble portion) with 53 and 51 wt.% yields, respectively. The effects of reaction variables on the extent of the reaction were investigated, such as amount of potassium metal, anionization time, kinds of reaction solvent, alkyl groups, and raw coals. The structural parameters of a series of oils indicate that highly effective depolymerization and alkylation of the present reaction result in the conversion of much of the condensed aromatic portion of the coal to oil.
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