Detailed kinetic modeling of pyrolysis of tetrabromobisphenol A

Mechanism of Thermal Decomposition of Tetrabromobisphenol A (TBBA)

“…3 Several experimental studies have been carried out to address the decomposition of either pure TBBA or TBBA immersed in polymeric matrices, under pyrolytic or oxidative conditions; typically in the range of 300 o C to 600 o C . [4][5][6][7][8][9][10][11] Major products from the pyrolysis of TBBA include HBr, brominated phenols and benzenes, in addition to char and a wide range of brominated aromatics. Almost half of the initial bromine in the parent TBBA was found to transform into HBr.…”

“…8,[12][13][14] Suggested mechanisms for decomposition of TBBA involve loss of HBr, successive C-Br bond fission, cleavage of the isopropylidene linkage, cross-linking condensation reaction and bimolecular reactions involving radicals and TBBA. 9 Several kinetic models were constructed to account for the overall decay of TBBA and the formation of the experimentally observed products. 15 It was proposed that, debromination and scission reactions, yielding brominated phenols, dominate the overall decomposition of TBBA.…”

“…Marongiu et al 9 validated their semi-detailed kinetic model against several sets of experimental data. More recently, Font et al 6 simplified the model of Marongiu et al 9 and…”

“…Thermochemical and kinetic data of this model were frequently carried over from those of analogous species and corresponding reactions. For instance, Marongiu et al 9 derived rate constants for the prominent reactions in their comprehensive kinetic model from the analogous gas phase reactions.…”

Transformation of tetrabromobisphenol A in the presence of different solvents and metals

“…Subsequently, the metallic fractions, which often contain 12-18% of plastics (Hou et al, 2010), are further upgraded in incinerators or melting furnaces to recover pure metals, and the plastic fractions are thermally treated to allow the recovery of gases, oils and chars as fuels or feedstocks. It is highly desirable to remove BFRs before thermal processing (e.g., incineration, combustion, and pyrolysis) of both metal-rich and plastic fractions because BFRs can form polybrominated dibenzop-dioxins/dibenzofurans (PBDDs/Fs) and other toxic brominated phenols (Wichmann et al, 2002;Barontini et al, 2004;Marongiu et al, 2007) at relatively high temperature conditions. It is known that PBDDs/Fs have toxicities similar to polychlorinated dibenzop-dioxins/dibenzofurans that are classified as carcinogenic compounds to human (Birnbaum et al, 2003).…”