Impacts of Pyrolytic Interactions during the Co-pyrolysis of Biomass/Plastic: Synergies in Lignocellulose-Polyethylene System
Impacts of Pyrolytic Interactions during the Co-pyrolysis of Biomass/Plastic: Synergies in Lignocellulose-Polyethylene System
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DOI：
10.3775/jie.98.202
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发表时间：
2019-09-01
影响因子：
0.2
通讯作者：
Yoshioka, Toshiaki
中科院分区：
文献类型：
--
作者：
Kumagai, Shogo;Fujita, Kohei;Yoshioka, Toshiaki
采用一种新的方法对纤维素-半纤维素-木质素-聚乙烯体系的多重热解相互作用进行了深入的研究，该方法通过产物回收试验和放出气体分析-质谱仪对热解产物的现场监测来评价热解相互作用的影响。纯净纤维素的快速热解。木聚糖，磨碎的木质素。山毛榉木材、聚乙烯和它们的混合物在650摄氏度下使用联合方法进行。纤维素/聚乙烯、木聚糖/聚乙烯中的相互作用。磨木木素/聚乙烯体系促进CO和C-2-C-3碳氢化合物的生成，同时抑制重焦油、蜡和焦炭等固体物质的生成。聚乙烯作为生物质注入后的分散剂，其气化性能的改善主要是由于富氢聚乙烯裂解产物与气相中含碳自由基之间的氢交换增强。结果表明，生物质组分(纤维素-半纤维素-木质素)在与聚乙烯接触之前优先发生热解相互作用，然后山毛榉木材热解产物进一步与聚乙烯热解产物相互作用。因此，这种新的方法可以对热解相互作用进行高级评估，并可以应用于纤维素-赫尼纤维素-木质素-塑料体系中不同的组合和组成。这将有助于了解共热解体系的性质，并预测共热解在实际能源和化工原料生产中的意义。
Multiple pyrolytic interactions in the cellulose-hemicellulose-lignin-polyethylene system were thoroughly investigated using a novel approach, which evaluates the pyrolytic interaction impacts through product recovery tests and the in-situ pyrolysate monitoring by evolved gas analysis-mass spectrometry. Fast pyrolysis of neat cellulose. xylan, milled wood lignin. beech wood, polyethylene, and their mixtures was conducted at 650 degrees C using the combined approach. Interactions in the cellulose/polyethylene, xylan/polyethylene. and milled wood lignin/ polyethylene systems enhanced the production of CO and C-2-C-3 hydrocarbons, and simultaneously inhibited that of solids such as heavy tar, wax, and coke. Polyethylene worked as a dispersant of biomass upon injection, and the improved gasification was mainly due to the enhanced hydrogen-exchange between hydrogen-rich polyethylene pyrolysates and carbon-centered radicals in vapor phase. The results suggested that pyrolytic interactions in the biomass components (cellulose-hemicellulose-lignin) occur preferentially before contact with polyethylene, and then the beech wood pyrolysates further interact with the polyethylene pyrolysates. Thus, this novel approach allowed advanced evaluation of pyrolytic interactions and can be applied to different combinations and compositions in the cellulose-hernicellulose-lignin-plastic system. It will help understand the nature of co-pyrolysis systems and predict the significance of co-pyrolysis in practical energy and chemical feedstock production.