The Pilot Plant Test Of Dephenolized Phenol Oil Hydrorefining To Clean Fuel

Dephenolized phenol oil is produced from coal tar. Coal tar is separated into a number of fractions by distillation. The fraction seething between 170℃ and 210℃ is phenol oil, which contains abundant phenolic substance. When the phenolic substance are removed from phenol oil, dephenolized phenol oil is obtained. Dephenolized phenol oil seethes from 70℃ to 208℃, according with the National Standard of the People’s Republic of China for gasoline. After hydrotreated, dephenolized phenol oil can be used as gasoline blend oil. The industrialization of the hydrorefining of dephenolized phenol oil will affect the energy strategy of China. But the researches are still staying in bench scale. The further research is needed. This work tries to hydrotreat the dephenolized phenol oil on pilot plant, which is the essential step before industrialization.For high sulfur and nitrogen composition in dephenolized phenol oil, the process of desulphurization and denitrification is an important step in the hydrorefining. The commercial NiMo/Al2O3 was used as the catalyst of the hydrorefining, which was made in our laboratory. Based on the result of the bench scale, this work tried to hydrotreat the dephenolized phenol oil on pilot plant, testing the effect of the catalyst and the reaction condition on the desulphurization and denitrification. Hydrorefining process contained two pieces of hydrogenation. First hydrogenation was processed under 160℃ to remove the dienes that were easy coking. Second hydrogenation was processed under 360℃ to remove sulfur and nitrogen. Both hydrogenation reactors were filled with 200 mL catalyst. The hydrogen pressure was 8 MPa and the hydrogen purity was about 99.999%. The space velocity was 0.5 h-1 and the hydrogen-oil ratio was 1200:1. Hydrorefining products were detected that the contents of sulfur and nitrogen were reduced to 140 ppm and 62 ppm respectively. The distillation range of the product was 45℃～210℃. The octane number was 87. The product could be used as gasoline blend oil. Keep hydrorefining device running for 2000 h to test the stability of the catalyst. The result revealed that the stability of the catalyst was satisfactory. The sulfur mass balance and nitrogen balance were calculated to check the concentration of sulfur and nitrogen in outlet gases. The result showed that the major sulfur and nitrogen were entered into waste water. Calculate the hydrogen consumption in the process of the hydrorefining of dephenoliztion phenol oil. The hydrogen consumption was 3.31% and chemical hydrogen consumption was 3.28%. According to the test, dephenolized phenol oil was perfectly hydrotreated under pilot plant test. Sulfur and nitrogen were reduced to a low level. The hydrogenation of partial unsaturated aromatic ring was in favor of combustion performance of the product. The product can be used as the gasoline blend oil. The test revealed that the hydrorefining process of the dephenolized phenol oil could meet the requirement of industrialization.