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Conventional pyrolysis of waste plastics gives fuel oil of wide boiling ranges, which uses a tank reactor or a kiln. For the effective conversion of polyolefins into fuel gas, a new type of a thermal process using a moving-bed reactor has been developed. The gas production at 70-94 wt% was achieved in the operation research. The key points are the reactor design and the reaction control considering polymer-decomposition mechanism.
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| Photo : A bench scale plant of a moving-bed reactor |
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Figure: Yields and compositions of gaseous products from polypropylene under various conditions. The letters C and P designate catalytic decomposition and pyrolysis, respectively. The figures 500, 600, and 700 designate reactor temperatures (°C). The yields are weight percents to a feed polypropylene. C1: methane, C2: ethylene, ethane, C3: propylene, propane, C4: butanes, C5: pentanes, C6: hexanes.
Reaction conditions; As a feed, polypropylene (0.8 kg) was mixed with sand (7.2 kg) in pyrolysis, or mixed with sand (6.8 kg) and silica-alumina catalyst (0.4 kg) in catalytic decomposition. Residence time for all runs was 10 min. |
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| Relational Information |
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AIST TODAY Vol.5, No.7 (2005) p.22-23
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