Steam gasification of epoxy circuit board in the presence of carbonates |
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Authors: | Shangzhong Zhang Kunio Yoshikawa Hideki Nakagome Tohru Kamo |
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Institution: | 1. Department of Environmental Science and Technology, Tokyo Institute of Technology, G5-8, 4259 Nagatsuta, Midori-ku, Yokohama, Kanagawa, 226-8502, Japan 2. Tokyo Institute of Technology, Frontier Research Center, G5-8, 4259 Nagatsuta, Midori-ku, Yokohama, Kanagawa, 226-8502, Japan 3. Faculty of Engineering, Chiba University, 1-22 Yayoi-cho, Inage-ku, Chiba, Chiba, 263-8522, Japan 4. National Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba, Ibaraki, 305-8569, Japan
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Abstract: | To recover useful metals from end-of-life electronic devices and to convert plastic components from these devices into clean fuel gas, steam gasification of epoxy board samples was carried out at 600–700?°C and 0.1?MPa pressure in the presence of a ternary eutectic carbonate (lithium carbonate, sodium carbonate, and potassium carbonate). Hydrogen and carbon dioxide were the main products, and methane and carbon monoxide were detected as minor products. The gasification proceeded in two steps: an initial rapid pyrolysis followed by secondary steam gasification of char produced from the pyrolysis. The ternary eutectic carbonate accelerated not only the latter steam gasification but also the initial rapid pyrolysis. The activation energy for the steam gasification of epoxy board samples in the presence of the carbonate was 122?kJ/mol. |
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