Soler Aurora, Conesa Juan A, Ortuño Nuria
Department of Chemical Engineering, University of Alicante, P.O. Box 99, E-03080, Alicante, Spain.
Department of Chemical Engineering, University of Alicante, P.O. Box 99, E-03080, Alicante, Spain.
Chemosphere. 2017 Nov;186:167-176. doi: 10.1016/j.chemosphere.2017.07.146. Epub 2017 Jul 30.
Degradation of brominated flame retardants present in printed circuit boards (PCBs) was tested using subcritical water in a high pressure reactor. Debromination experiments were carried out in a batch stirred reactor at three different temperatures (225 °C, 250 °C and 275 °C) keeping a solid to liquid (S/L) ratio of PCB:water = 1:5 during 180 min. Results indicated that debromination efficiency was increased with temperature (18.5-63.6% of bromine present in the original PCB was removed). Thermal decomposition of the debrominated materials was studied and compared with that of the original PCB. Thermogravimetric analyses were performed at three different heating rates (5, 10 and 20 K min), studying both the pyrolysis (inert atmosphere) and combustion (in air). Pyrolysis runs of the debrominated materials were also performed in a quartz horizontal laboratory furnace at 850 °C, in order to study the emission of pollutants. More than 99% of the bromine was emitted in the form of HBr and Br. Emissions of polycyclic aromatic hydrocarbons (PAHs) and bromophenols (BrPhs) decreased with the increase in the treatment temperature; naphthalene (10,800-18,300 mg kg original sample) and monobrominated phenols (12.8-16.9 mg kg original sample) were the most abundant compounds.
在高压反应器中使用亚临界水测试了印刷电路板（PCB）中存在的溴化阻燃剂的降解情况。在间歇搅拌反应器中于三个不同温度（225℃、250℃和275℃）进行脱溴实验，在180分钟内保持PCB与水的固液（S/L）比为1:5。结果表明，脱溴效率随温度升高而增加（去除了原始PCB中18.5 - 63.6%的溴）。研究了脱溴材料的热分解情况，并与原始PCB的热分解情况进行了比较。在三种不同加热速率（5、10和20 K min）下进行热重分析，研究热解（惰性气氛）和燃烧（空气中）过程。还在石英卧式实验室炉中于850℃对脱溴材料进行热解实验，以研究污染物的排放情况。超过99%的溴以HBr和Br的形式排放。多环芳烃（PAHs）和溴酚（BrPhs）的排放随处理温度的升高而降低；萘（10,800 - 18,300 mg kg原始样品）和单溴酚（12.8 - 16.9 mg kg原始样品）是最主要的化合物。
