2004 Fiscal Year Final Research Report Summary
Total recycle of waste plastics by combined process using supercritical fluids as extraction and reaction media
| Project/Area Number |
14350420
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
反応・分離工学
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| Research Institution | Kumamoto University |
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Principal Investigator |
GOTO Motonobu Kumamoto University, Dept of Applied Chemistry and Biochemistry, Professor, 工学部, 教授 (80170471)
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| Co-Investigator(Kenkyū-buntansha) |
SASAKI Mitsuru Kumamoto University, Associate Professor, 工学部, 助教授 (40363519)
HIROSE Tsutomu Kumamoto University, Professor, 工学部, 教授 (40037841)
SAKATA Masayo Kumamoto University, Assistant Professor, 工学部, 助手 (60187391)
NAGAOKA Shoji Kumamoto Industrial Research Institute, Researcher, 材料開発部, 研究者
GENTA Minoru Mitsubishi Heavy Industries, Ltd., Kobe Shipyard & Machinery, Researcher, 神戸造船所・環境プラント部, 研究者
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| Project Period (FY) |
2002 – 2004
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| Keywords | Supercritical fluid / Chemical recycle / Depolymerization / Hydrolysis / Methanolysis / Extraction / Flame retardant |
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| Research Abstract |
Fundamental technology for the recycle process of waste plastics by using supercritical fluids was developed. For depolymerization of PET in supercritical methanol, reaction mechanism was revealed and kinetics was analyzed. Monomerization from low molecular polymer was rate-limiting step in whole depolymerization process from polymer to monomers. The influence of mass transfer between polymer melt and supercritical fluid phase is shown and the importance of agitation is indicated. Kinetic analysis based on consecutive reaction gave the reaction rate constants. In collaboration with Industry, the depolymerization in pilot scale was successfully demonstrated, where recycled PET bottle produced from depolymerizaed monomers from waste PET bottle was shown to be similar quality to virgin one. Monomerization of nylon 6 and nylon 12 was studied in supercritical water. It was shown that the monomerization proceed in supercritical water by hydrolysis and cyclodehydration. The reaction conditions were optimized and the reaction mechanism was revealed. For FRP(fiber reinforced plastics), decomposition in supercritical water and sub- and supercritical DGMM, it was found that unsaturated polyester in FRP can be decomposed to dissolve in solvent and fiber can be recovered. For phenoric resin used in electric printed board, supercritical water was able to decompose into monomers such as phenols and cresols. As an extraction process, supercritical carbon dioxide was used to extract flame retardant contained in electric circuit board. Triphenyl phosphate which is one of the flame retardant, was easily extracted and the extraction behavior was analyzed.
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Research Products
(5 results)
