| 摘要 |
PURPOSE:To stably prepare mesophase pitch in a continuous manner for a long period of time, by heat-treating desludged coal tar, conducting evaporation or distillation to remove a gaseous product and a low b.p. fraction, and hydrogenating the treated product. CONSTITUTION:Coal tar is treated by filtration separation at 50-350 deg.C under a pressure of 1-15kg/cm<2> to desludge the coal tar, thereby reducing the content of quinoline insolubles to 200ppm or less. The treated coal tar is led to a heating oven, where it is heat treated at 300 deg.C or above to decompose chlorinated compounds into Cl2 and HCl gas, etc. The heat-treated coal tar is then evaporated or distilled to separate and remove a gaseous decomposition product and a low b.p. coal tar fraction. The coal tar soft pitch thus obtd. is hydrogenated in the presence of a hydrogenation catalyst having an average catalyst pore diameter of 90-160Angstrom , a total pore volume of pores having a pore diameter of 35Angstrom or more of 0.4-1.0cc/g and a total surface area of 100m<2>/g or more and comprising a porous inorganic carrier composed mainly of Al2O3 and, supported thereon, 10-30wt.% first catalyst metal component composed of Mo, 1-6wt.% second catalyst metal component composed of Ni and/or Co under conditions of a hydrogen pressure of 50-180kg/cm<2>, a temperature of 300-420 deg.C, a liq. space velocity of 0.1-2.0H<-1>, and an H2 to oil ratio of 100-2,000Nl/l.
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