| abstract |
PROBLEM TO BE SOLVED: To reduce the consumption of hydrogen gas and reduce liquefaction as compared with the conventional coal liquefaction method by suppressing undesired reactions resulting from the thermal decomposition of coal. Provided is a coal liquefaction method capable of obtaining oil at a high yield. SOLUTION: A coal liquefaction method including a hydrogenation step of hydrogenating coal such as lignite in the presence of a solvent and a catalyst, By using an iron compound that converts to pyrolotite at a temperature of 250 ° C. or less as a catalyst, and then performing low-temperature hydrogenation at a temperature of 250 to 400 ° C., and then performing high-temperature hydrogenation at a temperature higher than the temperature at the low-temperature hydrogenation, A coal liquefaction method characterized by hydrogenation. |