Xu Jialin, Zhou Kuo, Qin Linlin, Tan Zaiming, Huang Shijing, Duan Peigao, Kang Shimin
Engineering Research Center of None-Food Biomass Efficient Pyrolysis and Utilization Technology of Guangdong Higher Education Institutes, Guangdong Provincial Key Laboratory of Distributed Energy Systems, Dongguan University of Technology, Dongguan 523808, China.
School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, China.
Polymers (Basel). 2023 Jan 12;15(2):413. doi: 10.3390/polym15020413.
The chemical recycling of end-of-life polylactic acid (PLA) plays roles in mitigating environmental pressure and developing circular economy. In this regard, one-pot tandem alcoholysis and hydrogenation of PLA was carried out to produce 1,2-propanediol, which is a bulk chemical in polymer chemistry. In more detail, the commercially available Raney Co was employed as the catalyst, and transformation was conducted in ethanol, which acted as nucleophilic reagent and solvent. Single-factor analysis and Box-Behnken design were used to optimize the reaction conditions. Under the optimized condition, three kinds of PLA materials were subjected to degradation. Additionally, 74.8 ± 5.5%, 76.5 ± 6.2%, and 71.4 ± 5.7% of 1,2-propanediol was yielded from PLA powder, particle, and straws, respectively, which provided a recycle protocol to convert polylactic acid waste into value-added chemicals.
废弃聚乳酸（PLA）的化学循环利用在缓解环境压力和发展循环经济方面发挥着作用。在这方面，进行了聚乳酸的一锅串联醇解和氢化反应以生产1,2 - 丙二醇，1,2 - 丙二醇是聚合物化学中的一种大宗化学品。更详细地说，使用市售的雷尼钴作为催化剂，并在乙醇中进行转化，乙醇作为亲核试剂和溶剂。采用单因素分析和Box - Behnken设计来优化反应条件。在优化条件下，对三种聚乳酸材料进行降解。此外，聚乳酸粉末、颗粒和秸秆分别产生了74.8±5.5%、76.5±6.2%和71.4±5.7%的1,2 - 丙二醇，这提供了一种将聚乳酸废料转化为增值化学品的回收方案。
