Formation of hydrogen bromide and organobrominated compounds in the thermal degradation of electronic boards

Degradation of brominated flame retardant in computer housing plastic by supercritical fluids

“…1 shows the bromine balance of waste computer housing plastic after sc-methanol, isopropanol and water treatments. No inorganic bromine was detected in the gaseous phase in all experiments which was different from pyrolysis results that HBr mostly existed in gaseous phase [22,23]. After sc-methanol and isopropanol treatments, almost all the Br was transferred into the oils in the form of hydrogen bromide, since HBr could dissolve in alcohol and it adhered to oil when methanol and isopropanol evaporated.…”

Kinetics of tetrabromobisphenol A (TBBPA) reactions with H2SO4, HNO3 and HCl: Implication for hydrometallurgy of electronic wastes

“…Similar transformation pathway has been observed in the photochemical behavior of TBBPA reported by Eriksson et al [25]. Barontini et al [26] investigated the thermal decomposition pathways of TBBPA and also proposed simultaneous occurrence of debromination reactions and ␤-cleavage reactions in thermal degradation of TBBPA. The hydroxyl radical generated by UV/Fenton could also cause the sequential debromination of TBBPA and ␤-cleavage of TBBPA to produce less brominated BPA and bromophenols [21].…”

Pyrolysis and combustion of electronic wastes

“…In this case the decomposition took place in the range 400-550 8C (673-823 K), a little wider than that of the residues considered in this paper. Barontine and Cozzani [17] used the TG for simulating pyrolysis and combustion of dynamic runs, using electronic boards. The shape of the curves and the decomposition ranges were similar to those presented in this paper.…”

“…In this case, where the bromine is a main element in the elemental analysis of the samples, polybrominated dibenzodioxins can be more important than the chlorine isomers. Some authors are studying the relation between PBDD/F emissions and some brominated compounds that are identified as precursors in the formation of these dioxins [17][18][19][20][21][22]. Following the studies of these authors, the identification of dibromophenol and tribromophenol, On the other hand, polychlorinated dioxins and furans and dioxin like PCBs were analysed in the raw samples and in the combustion and pyrolysis runs.…”