Debromination of tris (tribromophenoxy) trizine by pyrolysis with calcium hydroxide

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Metal oxides and hydroxides reduce the emission of brominated compounds during pyrolysis of plastics containing brominated
flame retardants (BFR). Calcium hydroxide is very effective when used with legacy BFR but is yet to be tested with novel BFR. This
study investigates the effectiveness of calcium hydroxide in capturing bromine from 2,4,6-tris-(2,4,6-tribromophenoxy)-1,3,5-triazine
(TTBP-TAZ) across a range of pyrolytic temperatures. We combine the thermogravimetric analysis with differential scanning
calorimetry and record infrared spectra of the evolved gases and the solid residues. The results demonstrate significant differences in
the decomposition of TTBP-TAZ with and without Ca(OH)2. The volatilisation of neat TTBP-TAZ proceeds mainly in one dominant
step, whereas that with Ca(OH)2 comprises three stages. Calcium hydroxide captures all HBr produced in the pyrolysis of TTBP-TAZ
and greatly reduces the emission of brominated phenols, capturing 67 % Br initially present in TTBZ-TAZ as CaBr2.

Original languageEnglish
Title of host publicationAustralian Combustion Symposium 2023 26-29 November 2023, Darwin
Subtitle of host publicationTowards Clean Combustion and Decarbonisation
Place of PublicationDarwin
PublisherCharles Darwin University
Number of pages4
Publication statusE-pub ahead of print - 2023


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