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Supercritical Chemical Recycling of plastics with Continuous Mixture Kinetics

利用连续混合动力学进行塑料超临界化学回收

基本信息

批准号：
11694170
负责人：
GOTO Motonobu
金额：
$ 3.52万
依托单位：
Kumamoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

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.

利用连续混合动力学的理论发展和计算机软件的理论计算，在超临界流体中进行了PET和尼龙等聚合物分解的实验和数据分析。作为理论研究，分子量分布用连续分布函数来表示。发展了连续动力学理论来分析分解行为。该理论包括通过随机和特定断裂以及单体组分的二次反应来改变聚合物的分子量分布（MWD）。通过MWD的Gamma分布连续动力学模拟了MWD和单体随时间的变化。为了开发塑料的化学回收技术，研究了塑料在超临界水或甲醇中的降解。使用高压间歇反应器或连续流动反应器。作为塑料样品，采用了最可回收的缩聚塑料PET。研究了PET在超临界甲醇和超临界水中的降解情况，开发了废塑料的化学回收工艺。对实验数据应用连续动力学分析。获得产物的MWD作为反应时间的函数。测量包括副产物在内的分解产物的单体组分的产率以阐明反应机理。还研究了尼龙 6 在超临界水中的降解。加成聚合塑料以及缩聚塑料在超临界水中分解。连续混合物动力学成功应用于超临界流体中塑料降解的分析和模拟。