| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing ashless coal, comprising extracting coal with a solvent to obtain the solvent-soluble component and then separating the component to obtain the ashless coal, by which the solvent can more easily be recovered and recycled than by conventional methods. SOLUTION: This method for producing the ashless coal, comprising a process for mixing a solvent with coal to prepare the slurry, a process for heating the slurry at 300 to 420°C in the presence of an inert gas to extract a solvent-soluble coal component, a separation process for separating a solvent-insoluble coal component from the obtained slurry, a process for separating and recovering the solvent attached to the separated solvent-insoluble coal component, a process for recovering the solvent from the solvent-soluble coal component obtained by the above separation process to obtain the ashless coal, and a process for circulating the recovered solvent to the slurry-preparing process, is characterized by using a coal-originated oil having a boiling point range from a boiling point (selected from 180 to 200°C) to a boiling point (selected from 300 to 330°C) as the solvent in the slurry-preparing process. COPYRIGHT: (C)2005,JPO&NCIPI
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