废轮胎热解油加氢精制硫氮脱除特性研究

Characteristics of the removal rate of sulfur and nitrogen by hydrofining for oil from pyrolysis of scrap tires in pilotscale rotary kiln was investigated．The effectw of reaction temperature (240℃~390℃), pressure (2.0MPa~3.0MPa), volume airspeed (1.0h-1~2.0h-1) and hydrogen oil volume ratio (800〖DK〗∶1~1200∶1) were examined. Reaction temperature has a remarkable influence on the removal rate of sulfur and nitrogen. Reaction pressure does not show obvious impact on the removal rate for light fraction pyrolytic oil. However, higher reaction pressure improves the removal rate for middle fraction pyrolytic oil, especially denitrogenation rate. Lower volume airspeed and higher hydrogen oil volume ratio increase the removal rate of both sulfur and nitrogen. The optimum condition is acquired for light fraction pyrolytic oil, that is 360℃, 3.0MPa，volume airspeed of 2.0h-1, and hydrogen oil volume ratio of 800∶1. The rate of desulfurization and denitrogenation are over 97%. Under this condition the mass content of sulfur after hydrofining is 0.025%, reaching national standard of automobile unleaded gasoline for sulfur which is lower than 0.1%. For middle fraction pyrolytic oil, when reaction temperature is 390℃ and other parameters just like light fraction oil, the removal rate of sulfur and nitrogen could reach 94% and 79%, respectively.