Abstract: Chlorine in the pyrolysis oil of waste plastics directly affects the subsequent catalytic cracking and hydrogenation processes，because in these processes, if the chlorine content in the raw materials exceeds the standard, the formed HCl will corrode the equipment,resulting in pitting and perforation,which seriously affect safety production.The chlorinated compounds in the pyrolysis oil of waste plastics are almost entirely organic chlorine in the form of chlorinated hydrocarbons. Through the analysis of the forms of chlorine in the light fractions of plastic pyrolysis oil, it was found that chlorine exists in the forms of 1,2-dichloropropane, tetrachloroethylene, 4-chlorotoluene, 2-chloroethyl acetate, 2-chloroethyl benzoate, etc. The experiment investigated the effect of solvent extraction dechlorination, and simulated oil was prepared using the above-mentioned chlorinated compounds and white oil. Transition metal T-based and activated carbon supported NL-based nanocatalysts were used as catalysts to investigate the catalytic dechlorination effect, and dechlorination tests were conducted on actual plastic pyrolysis oil. The results showed that the combination of solvent extraction and activated carbon loaded NL-based nanocatalyst had better dechlorination effect, with a maximum single removal rate of 99.9% for the model oil. The mass fraction of chlorine in the oil phase of actual waste plastic pyrolysis oil can be reduced to below 10 μg/g.

Key words: waste plastic pyrolysis oil, extractive dechlorination, catalytic dechlorination, solvent