Two-stage thermal gasification of polyolefins |
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Authors: | Toshiro Tsuji Yoshiki Tanaka Hironori Itoh |
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Institution: | (1) Graduate School of Engineering, Hokkaido University, N13W8 Kita-ku, Sapporo 060-8628, Japan Tel./Fax +81-11-706-6552 e-mail: ttsuji@eng.hokudai.ac.jp, JP |
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Abstract: | Plastic pellets of polyethylene (PE), polypropylene (PP), and polystyrene (PS) were gasified in a two-stage thermal degradation
process. The first stage is the conversion of polyolefins to distilled oils using a melting vessel. In the second stage, the
oils from the first stage are gasified using a tubular reactor. The distilled oil yields of PE, PP, and PS in the first stage
were 84, 89, 92 wt%, respectively, each at 470°C. The total gas yields of PE, PP, and PS in the second stage were 80, 74,
and 6.2 wt%, respectively, each at 800°C. The main components of the product gas for PE and PP were methane and olefins such
as ethene and propene. Some aromatic oils, including benzene, toluene, and xylene, were also produced as by-products. The
amount of carbonaceous residue, or coke, was very low (less than 1 wt%). By dividing the process into two stages, the coking
rate was considerably reduced compared with direct gasification of the polyolefins.
Received: July 19, 2000 / Accepted: September 17, 2000 |
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Keywords: | Waste plastics Pyrolysis Degradation Polymer |
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