| 摘要 |
PURPOSE:To provide a method of hydrocracking liquefied coal which enables the hydrocracking to be continuously conducted for a long period of time with excellent catalytic activity and selectivity while suppressing the deposition of a carbonaceous substance on a catalyst, by conducting the hydrocracking of liquefied coal in the presence of a specific hydrocracking catalyst. CONSTITUTION:An activated alumina powder such as gamma-alumina or an activated alumina precursor powder such as a hydrated alumina powder, e.g. boehmite powder is mixed with water and a forming assistant (e.g. nitric acid or a basic nitrogen compound) and, if necessary, 10-120wt% of carbon black. The mixture is formed into a spherical shape having a diameter of 0.5-3mm or a cylindrical shape having a diameter of 0.5-3mm and dried. The product is calcined at 500-1,000 deg.C for 1hr to 1 day to obtain a (porous) activated alumina to be used as a supporting material. On the activated alumina are supported 1-50% (by weight in terms of oxide; the same applies hereinafter) of a metal belonging to Group VI A of the periodic table and 0.1-20% of Ni or Co, or 0.01-10% (in terms of metal) of a platinum group metal etc. to obtain a hydrocracking catalyst. A liquefied coal which has been obtained as a secondary hydrocracking reaction product of a two-stage hydrocracking reaction of coal is decomposed to make more volatile in the presence of the hydrocracking catalyst under an H2 pressure of 50-300kg/cm<2>G at a temperature of 250-500 deg.C and a liquid space velocity of 0.1-5hr<-1>.
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