Studies on bromination and evaporation of antimony oxide during thermal treatment of tetrabromobisphenol A (TBBPA)

Michał Rzyman, Mariusz Grzegorz Grabda, Sylwia Oleszek-Kudlak, Etsuro Shibata, Takashi Nakamura

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

In this paper the bromination reaction between antimony oxide (Sb2O3) and hydrobromic acid, originating from the thermal decomposition of tetrabromobisphenol A (TBBPA), under inert and oxidative atmospheres was investigated using differential scanning calorimetry (DSC) analysis and a laboratory-scale furnace. The results indicate that the bromination follows the decomposition of the TBBPA and takes place below 340 °C in the furnace and around 280 °C during DSC analysis. During thermal treatment of a mixture of TBBPA and Sb2O3 (2.82:1, w/w), it was observed that volatilization of the SbBr3 began immediately after its formation occurred at about 340 °C. The maximum amount of antimony converted into SbBr3 (above 60%) was obtained from runs conducted at temperatures between 440 and 650 °C. The main intermediate products found in the solid residue were Sb4O5Br2 and Sb8O11Br2, which then decompose to more stable compounds such as Sb2O3 at temperatures above 440 °C. Finally, when a temperature of 650 °C is reached, Sb2O3 undergoes a carbothermic reduction into metallic antimony. Additional experiments conducted at selected temperatures under an oxidative atmosphere (He + 5%O2) indicated that the presence of oxygen has only a small influence on the bromination reaction, however, these conditions may enhance the decomposition of TBBPA at 340 °C, which may result in enhanced evaporation of the formed SbBr3 at 340 °C.

Original languageEnglish
Pages (from-to)14-21
Number of pages8
JournalJournal of Analytical and Applied Pyrolysis
Volume88
Issue number1
DOIs
Publication statusPublished - 2010 May 1
Externally publishedYes

Keywords

  • Antimony recovery
  • TBBPA decomposition
  • Thermal processes
  • Waste recycling
  • WEEE

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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