| 摘要 |
The present invention is provided with a step for preheating coal, a step for heating an extraction solvent, a step for mixing the preheated coal and the extraction solvent heated to a higher temperature than the preheated coal and thereby heating the coal, a step for separating a solution in which a coal component is dissolved from the mixture of the coal and the extraction solvent, and a step for evaporating and separating the extraction solvent from the solution. |
