Graduate School of Environmental Studies, Tohoku University, 6-6-07 Aoba, Aramaki-aza, Aoba-ku, Sendai, Miyagi, 980-8579, Japan.
JEOL RESONANCE, Inc., 3-1-2 Musashino, Akishima, Tokyo, 196-8558, Japan.
Sci Rep. 2019 Feb 13;9(1):1955. doi: 10.1038/s41598-018-37146-w.
Recycling wood/plastic composites in municipal and industrial wastes currently represents a challenge which needs to be overcome. In this work, we considered the concept of independent pyrolysis of wood and plastic in wood/plastic mixtures for enabling a versatile catalytic process design which is capable of producing recoverable final products from both components. In order to reveal the influence of plastic on wood pyrolysis, the pyrolysis of beech wood (BW, wood material) in a polyethylene (PE) melt (polyolefin material) was performed at 350 °C. The combined use of thermogravimetric analysis, product recovery studies, in situ radical characterisations, and microscopic analysis revealed the influence of the PE melt on the BW pyrolysis. More specifically, a physical prevention of the intermolecular condensation and hydrogen abstraction from PE pyrolysates in the liquid/solid phase was observed. These interactions enhanced the production of levoglucosan and methoxyphenols by factors of 1.7 and 1.4, respectively, during the BW pyrolysis in the PE melt. Based on these results, we concluded that the observed synergistic effects could potentially control the yield and quality of useful products, as well as the utilisation of mixed wood/plastic wastes, which cannot be effectively recycled otherwise.
目前，在城市和工业废物中回收木塑复合材料是一个需要克服的挑战。在这项工作中，我们考虑了在木塑混合物中独立热解木材和塑料的概念，以实现一种多功能的催化过程设计，能够从两种组分中生产可回收的最终产品。为了揭示塑料对木材热解的影响，在 350°C 下进行了山毛榉木（BW，木材材料）在聚乙烯（PE）熔体（聚烯烃材料）中的热解。热重分析、产物回收研究、原位自由基特性和微观分析的综合使用揭示了 PE 熔体对 BW 热解的影响。具体来说，观察到在液/固相中 PE 热解产物的分子间缩合和从 PE 热解产物中提取氢被物理阻止。在 PE 熔体中进行 BW 热解时，这些相互作用分别将左旋葡聚糖和甲氧基苯酚的产量提高了 1.7 倍和 1.4 倍。基于这些结果，我们得出结论，观察到的协同效应有可能控制有用产品的产量和质量，以及混合木塑废物的利用，否则这些废物无法有效回收。
