Depolymerization of End-of-Life Poly(lactide) to Lactide via Zinc-Catalysis
Depolymerization of End-of-Life Poly(lactide) to Lactide via Zinc-Catalysis
复制标题
DOI：
10.1002/slct.202003979
复制
发表时间：
2020-12-11
期刊：
影响因子：
2.1
通讯作者：
Enthaler, Stephan
中科院分区：
文献类型：
--
作者：
Alberti, Christoph;Enthaler, Stephan
研究了聚丙交酯的化学循环利用，特别是解聚的初始步骤。高分子量聚乳酸在锌催化剂存在下解聚为丙交酯，丙交酯是合成高分子量聚乳酸的工业相关化学品，因此，不需要解聚试剂，高效回收是可行的。观察到醋酸锌(II)的优良性能，在200-210℃下，转化频率高达260小时(-1)。值得注意的是，丙交酯通过反应蒸馏分离出高纯度。此外，醋酸锌催化剂最多可循环使用五次。
The chemical recycling of poly(lactide) (PLA), especially the initial depolymerization step was studied. High molecular weight PLA was depolymerized in the presence of zinc catalyst to lactide, the industrial relevant chemical for the synthesis of high molecular weight PLA; therefore, an efficient recycling is feasible without the need for depolymerization reagents. An excellent performance was observed for zinc(II) acetate with turnover frequencies of up to similar to 260 h(-1) at 200-210 degrees C. Noteworthy, the lactide was isolated in high purity by reactive distillation. Furthermore, the zinc(II) acetate catalyst was recycled up to five times.