Experimental study on the hydrogenation of coal tar light oil to clean fuel

Because of the shortage of petroleum in China,it has great significance to produce fuel oil and fine chemicals from the hydrogenation of considerable amount of coal tar.Three kinds of mixed oil from light distillated oil were used as raw feedstocks to carry out the hydro-refining experiment in a fixed bed hydro-refining unit.The influence of reaction pressure and temperature,liquid volume space velocity,hydrogen/oil ratio on the produced oil properties were investigated.The results indicate that the nitrogen content,sulfur content and aromatic content of products decrease with the increase of reaction temperature,pressure and hydrogen/oil ratio,but increase significantly with the rising of liquid volume space velocity.Under the optimum condition of the reaction temperature at 360 ℃,reaction pressure at 16 MPa,liquid volume space velocity at 0.25 h~(-1) and the ratio of hydrogen/oil at 1 800,the yield of the produced oil is up to 98. 03%.The produced oil is distilled to obtain naphtha <170 ℃ and diesel oil >170 ℃.The naphtha fraction has a density of 776.9 kg/m~3 at 20 ℃,no sulfur and nitrogen are detected,and the latent content of aromatics is 67.6%.It can be used as a high quality catalytic reforming raw materials.Diesel fuel has low aromatics content,without sulfur nitrogen,high flash point,low condensation point and is suitable for distillation,thus it can be used as a blend of diesel oil.