期刊
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
卷 92, 期 1, 页码 131-136出版社
ELSEVIER
DOI: 10.1016/j.jaap.2011.05.005
关键词
Waste printed circuit boards (WPCBs); Brominated flame retardants (BFRs); Hydrothermal decomposition
资金
- National Key Technology R&D Program of China [2008BAC46B02]
- Key Research Project of Shanghai in China [09dz1204402]
- Jiangsu Province Key Laboratory of Environmental Materials and Engineering [K090024]
Brominated flame retardant (BFR), which containing in printed circuit boards (WPCBs), brings a series of environmental and health problems. Hydrothermal technology was applied to decompose brominated epoxy resin in WPCBs at subcritical or supercritical water conditions. The brominated epoxy resin was decomposed into oil and the environmental influence of BFR was eliminated. The experiment was carried out in a 5.7 ml tube reactor and heated by a salt-bath. The variation of degradation rate of brominated epoxy resin with reaction temperature, time and additives were studied. The compositions of liquid products were analyzed by gas chromatography-mass spectrometry (GC-MS). When reaction temperature exceeded 300 degrees C, retention time stayed over 30 min and alkaline additive existed, more than 80% brominated epoxy resin could be mainly decomposed into phenol, which can be used as chemical material. Two different hydrothermal decomposition pathways were discussed according to the characterization of products. The results indicated that brominated epoxy resin in WPCBs could be handled effectively by hydrothermal decomposition. (C) 2011 Elsevier B.V. All rights reserved.
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