Abstract—In recent years, chemical recycling technologies
related to the pyrolysis of plastics into fuels have received
increasing attention under the circular economy agenda with
respect to resource depletion. Herein, a method is presented to
reduce halogen compounds in the product oil derived from the
pyrolysis of polystyrene with tetrabromobisphenol A. Analysis
was undertaken to identify the bromine compounds present in
the residue after the pyrolysis treatment. Pyrolysis was
conducted in the presence of hydrotalcites as a function of the
Mg and Al additive composition ratio (type 1; KW-1000 and
type 2; K W-2000). The bromine compounds identified in the
oil after pyrolysis at 400 °C were determined as 2-bromophenol,
4- bromophenol, 2,4-dibromophenol, 1- bromomethylbenzene,
2- bromomethylbenzene, and 3,6-dibromo-2,5-xylidine. In the
absence of hydrotalcite, bromine compounds were still detected
in the product oil, residue and gas, whereas the addition of
KW-2000 reduced the concentration of bromine compounds in
the product oil. The reduced concentration of the bromine
compounds in the product oil is suggested to be related to the
trapping of bromine by the added hydrotalcite during the
pyrolysis of the plastic.
Index Terms—Brominated flame retardants, hydrotalcite,
polystyrene, pyrolysis.
Kimi Hanazawa, Moemi Toritsuka, and Naoyuki Morita with with Tokyo
Metropolitan High School of Science and Technology, Japan (e-mail:
kimi.hanazwa@gmail.com, moemi.toritsuka@gmail.com,
Naoyuki_Morita@education.metro.tokyo.jp).
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Cite: Kimi Hanazawa, Moemi Toritsuka, and Naoyuki Morita, "Effects ofAdding Hydrotalcite with Different Compositional Ratios in the Pyrolysis Treatment of Brominated Plastics," International Journal of Chemical Engineering
and Applications vol. 12, no. 1, pp. 7-11, 2021.
