2001 Fiscal Year Final Research Report Summary
Supercritical Chemical Recycling of plastics with Continuous Mixture Kinetics
| Project/Area Number |
11694170
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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) |
HIROSE Tsutomu FACULTY OF ENGINEERING, KUMAMOTO UNIVERSITY, PROF., 工学部, 教授 (40037841)
KODAMA Akio FACULTY OF ENGINEERING, KUMAMOTO UNIVERSITY, ASSOCIATE, PROF., 工学部, 助手 (30274690)
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| Project Period (FY) |
1999 – 2001
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| Keywords | Supercritical fluid / Chemical recycling / Continuous mixture kinetics / Molecular weight distribution / Monomerizaton / Kinetic analysis / Supercritical methanol / Supercritical water |
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| Research Abstract |
Experiments and the data analysis for decomposition of polymers such as PET and Nylon were carried out in supercritical fluid by using theoretical development of continuous mixture kinetics and theoretical calculation with computer software. As a theoretical study, molecular weight distribution was expressed by continuous distribution function. Continuous kinetics theory was developed to analyze the decomposition behavior. The theory includes molecular weight distribution (MWD) change of polymer by random and specific scissions and secondary reactions for monomer components. Change of MWD and monomers as a function of time was simulated by the continuous kinetics with Gamma distribution for MWD.
To develop chemical recycling technology of plastics, degradation of plastics in supercritical water or methanol was studied. High pressure batch reactor or continuous flow reactor were used. As a sample of plastics, PET was adopted which is most recycled condensation polymerization plastics. Degradation of PET in supercritical methanol and supercritical water was investigated, to develop a chemical recycling process of waste plastics. Continuous kinetics analysis was applied to the experimental data. The MWD of the products was obtained as a function of reaction time. The yields of monomer components of the decomposition products including by-products were measured to clarify the reaction mechanism. Degradation of nylon 6 in supercritical water was also studied. Addition polymerization plastics as well as condensation polymerization plastics were decomposed in supercritical water. Continuous mixture kinetics were successfully applied to the analysis and simulation for plastics degradation in supercritical fluids.
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