| Summary: | 碩士 === 輔英科技大學 === 環境工程與科學系碩士班 === 107 === The studied PCB is FR-4 material. PCB was planed, crushed and sorted to obtain the non-metallic part of PCB. The pyrolysis onto non-metallic part of PCB was carried out in a microwave pyrolysis furnace. The effects of distinct particle size, NaOH addition, NaOH dose, residence time and temperature on pyrolysis characteristics were investigated. After pyrolysis, the solid residues and liquid oils were analyzed to evaluate their potential use as adsorbents and alternative fuels, respectively.
The experimental results indicated that the solid product decreased and the gas product increased, with increasing in pyrolysis temperature. For raw PCB pyrolysis, the lowest solid residue yield and the highest liquid oil yield can be found at pyrolysis temperature of 600 °C. For the pyrolysis with PCB added NaOH, which resulted in a reduction in liquid oil production and also increases the bromine content of the solid residues. In other words, almost no Br was released to the liquid oil and gas under pyrolysis with NaOH addition.
Compared to the pyrolysis of the raw PCB, the NaOH addition improved pore development, increasing the solid residue specific surface area and total pore volume to 16.69 m2/g and 0.034 cm3/g, respectively. For pyrolysis of the raw PCB, the chemical composition of liquid oil indicates that the carbon number of the compound species was in the range of C6-C12, with phenol, 4-isopropylphenol, 4-phenylphenol and 3-bromophenol, 4-bromo-2,6-xylidine as the main species. After NaOH addition, the brominated compounds such 3-bromophenol, 4-bromo-2,6-xylidine could not be detected in pyrolysis liquid oil.
Keywords: Pyrolysis, Printed circuit board, Brominated epoxy
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