To provide a method for producing ashless coal at low cost even if the ashless coal is produced through solvent extraction.
This method for producing the ashless coal comprises: a separation step S1 of mixing coal and a solvent capable of dissolving coal and separating the obtained mixture into ashless coal which is soluble in the solvent and residual coal which is insoluble in the solvent and contains ash; and an ashless coal recovery step S2 of recovering the separated ashless coal. The method further comprises: an oil content recovery step S3 of heat treating the residual coal separated in the separation step S1 at a temperature of 400°C or higher and recovering oil content generated; and an addition step S4 of adding all or a part of the oil content recovered in the oil content recovery step S3 to the solvent.
SHISHIDO TAKAHIRO
SAKAI KOJI
OKUYAMA NORIYUKI
INOUE TOSHINORI
Etsuo Tada
Tetsuo Tomita