The debrominated and lightweight oil generated from two stage pyrolysis of WPCBs by using compound chemical additives

[Display omitted] •Proposed application of compound agents for the catalytic pyrolysis of WPCBs.•Compound agents assessed significantly decrease the bromine content of pyrolytic oil.•Compound agents increased light oil fractions, while decreasing oil bromine content. The effect of employing compound additives were investigated for application to the catalytic pyrolysis of waste printed circuit boards (WPCBs), in order to recycle low brominated and lightweight oils. The study included the analysis of three-phase product yields; organic and inorganic bromine distributions; oil content; and the boiling point of experimental product fractions. Bromine distributions were analyzed using ion chromatography (IC) and oxygen bomb calorimeter, with oil products analyzed using gas chromatography-flame ionization (GC/FID) and gas chromatography-mass spectrometry(GC/MS). Results show that the pyrolysis liquid up to 27.04wt.% by using CaCO3+4A; the total bromine content(include organic and inorganic) of pyrolysis liquid was reduced to 4.68wt.% through Fe3O4+4A; Using Fe3O4+Al2O3 can increase the water content(68.76wt.%) of pyrolysis liquid; the application of Fe3O4+4A can cut down the organic bromine to 1.59wt.%; Fe3O4+5A can increase the 150–200°C fraction(gasoline) to 53.25%; the phenol fraction can be increased to 46.01% applied Fe3O4+5A; the bromophenol less than1.30% and bisbromophenol was not detected. Thererfore, using Fe3O4+5A to recycle the low brominated and lightweight pyrolysis oil have a huge significance,which can use as potential fuel.