Capturing approach for the toxic bromides generated in low-temperature pyrolysis of brominated resin
2022
Zhu, Jie | Yao, Zichun | Huang, Zhihao | Xiong, Siyaxuan | Tang, Yetao | Hsu, Chen-Min | Ruan, Jujun
In order to avoid secondary pollution during recovery of brominated resin, additives had been proposed for capturing bromine in high-temperature (700 °C) pyrolysis of brominated resin. However, the capture capacity and mechanism of CaCO₃ and activated carbon to the generated micromolecule bromides was still unknown in the low-temperature (300 °C) pyrolysis process, in which brominated resin could realize debromination. This paper accurately analyzed the capture capacity and mechanism of CaCO₃ and activated carbon to bromides by quantum chemistry calculation and wet experiments. CH₃Br was considered as the main bromide in the low-temperature pyrolysis. The capture process of CaCO₃ to CH₃Br turned to be physisorption, and one CaCO₃ particle with the size of 0.5 μm could captured 4.53 × 10⁻²² mol CH₃Br. The capture capacity of CaCO₃ to CH₃Br is only 2.37 × 10⁻⁹ mol/g. Furthermore, the capture capacity of activated carbon to CH₃Br was 8.50 × 10⁻⁵ mol/g. The mass of activated carbon needed to capture 4.03 × 10⁻⁴ mol CH₃Br generated of 1 g brominated resin in low-temperature pyrolysis was 3.68 g. This paper contributes scientific information and approach to the safe resource recovery of waste brominated resin.
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