Abstract: The steam cracking performance of the mixture was studied by using the mixture of foots oil and hydrocracking tail oil as feedstock of steam cracking unit for producing ethylene, on a steam cracking simulation test device. The effects of foots oil amount, cracking temperature and water/oil mass ratio on the yield of target olefins were investigated. The results show that the optimum steam cracking conditions are as follows: the mass fraction of foots oil is 20%, the cracking temperature is 820 ℃, and the water/oil mass ratio is 0.75. Under these conditions, the yields of ethylene and propylene were 34.3% and 14.65%, respectively.

Key words: foots oil, hydrocracking tail oil, pyrolysis simulation, synergism effect, ethylene