Abstract—In this study, a method is presented to reduce the halogen concentration in the oil produced upon pyrolysis of acrylonitrile–butadiene–styrene (ABS) resins containing brominated flame retardants. More specifically, hydrotalcite was added to a predetermined amount of ABS in a glass reactor, and subjected to pyrolysis at 400 °C in nitrogen atmosphere. The bromine content in the product oil, residue, and gas released upon pyrolysis was analyzed. The main components of the product oil following pyrolysis of ABS in the absence of hydrotalcite additive were toluene, ethylbenzene, styrene, 1-bromomethyl-4-methylbenzene, phenol, n-butyl benzene, 1-methoxy-1-methylethyl benzene, and bromine compounds 2-bromophenol, 4-benzyloxy bromobenzene, 2,6 dibromophenol, and 2-bromotoluene. In contrast, the content of bromine in the product oil decreased when hydrotalcite was added to ABS. Moreover, negligible amounts of bromine were detected when the amount of added hydrotalcite was greater than 8 g. The reduced content of bromine in the product oil was attributed to the efficient trapping of bromine in the hydrotalcite matrix (as determined by the content of bromine in the residue).
Index Terms—Acrylonitrile-Butadiene-Styrene (ABS), halogen, hydrotalcite, pyrolysis.
N. Morita is with the Department of Urban Environment Systems, Graduate School of Engineering, Chiba University, Japan (e-mail: Naoyuki_Morita@chiba-u.ne.jp).
M. Nakayasu is with the Tokyo Metropolitan Tama High School of Science and Technology, Japan (e-mail: Masami_1_Nakayasu@education.metro.tokyo.jp).
A. T. Saito, T. Wajima, and H. Nakagome are with Chiba University, Japan (e-mail: atsaito@r07.itscom.net, wajima@tu.chiba-u.ne.jp, nakagome@tu.chiba-u.ne.jp).
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Cite: N. Morita, M. Nakayasu, T. Wajima, A. T. Saito, and H. Nakagome, "Effect of Hydrotalcite on Bromine Content in Oil Produced from the Pyrolysis of Acrylonitrile-Butadiene-Styrene Plastics," International Journal of Chemical Engineering and Applications vol. 7, no. 4, pp. 249-253, 2016.
