2013-2-1 · The experiment to separate the WPCBs was conducted using a 0.5 L, four-neck flask equipped with a nitrogen gas inlet. Fig. 1 depicts a schematic diagram of the reactor. WPCBs was treated in DMSO in the presence of nitrogen gas following the condition: the WPCBs area of 16 mm 2, 64 mm 2, 144 mm 2, 256 mm 2, and 400 mm 2, the temperature of 105, 125, and 145 °C, the solid to liquid .