| 摘要 |
PROBLEM TO BE SOLVED: To stably liquefy coal at a high efficiency by mixing the coal with a solvent and a catalyst, carrying out the hydrogenolysis of the resultant slurry, providing a liquefied oil, distilling the prepared liquefied oil, controlling the feed rates of a medium oil and a heavy oil obtained by the distillation, hydrogenating the oils, affording a solvent with a constant aromatic hydrocarbon fraction and circulating the solvent for use. SOLUTION: Coal 1 is mixed with a catalyst 2 for liquefying the coal 1 and a solvent 3 for liquefying the coal 1 to provide a slurry 4, which is then heated and pressurized in the presence of hydrogen 5 to carry out the pyrolysis and hydrogenolysis reactions. Thereby, a liquefied oil is obtained, distilled under atmospheric and reduced pressures and separated into a product oil and a liquefaction residue. The feed rates of a part or all of the resultant medium oil 11 and a heavy oil 12 are controlled with a feed pump 14, etc., so as to keep the aromatic hydrocarbon fraction (fa ) of the produced solvent 3 for liquefying the coal 1 constant and hydrogenolysis is conducted by using a catalyst for hydrogenating the solvent 3 to produce the solvent 3 for liquefying the coal 1 at a constant fa . The resultant solvent 3 for liquefying the coal 1 is circulated for use in slurrying of the coal 1. |
