Process for debromination of novel brominated flame retardants using Zn-based additives

Abstract

There is disclosed a process for debromination of novel brominated flame retardants (NBFRs) through co-pyrolysis with zinc oxide (ZnO) and franklinite (ZnFe2O4) to effectively restrict brominated species emission from NBFRs during thermal degradation. The method addresses environmental concerns by converting tetrabromobisphenol A 2,3-dibromopropyl ether (TBBPA-DBPE) and tetrabromobisphenol A diallyl ether (TBBPA-DAE) into bromine-free hydrocarbons. Utilizing Zn-based metal oxides from electrical arc furnace dust (EAFD), this process transforms them into metal bromides, facilitating selective zinc extraction. Thermogravimetric analysis guides pyrolysis at up to 500° C., revealing ZnO's efficacy in capturing ˜92% of HBr gas and producing minimal brominated compounds (relative area, 0.83%). Phenol emerges as a significant condensable product, while inorganic gases and methane dominates the non-condensable fraction. The retained metal bromides in pyrochar and <8% HBr gas emissions underscore ZnO's debromination potential. This method also suggests ZnO's application for dehalogenating other polymers and using spinel ferrites in combating brominated polymers.

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