Synergistic effects during co-pyrolysis of milled wood lignin and polyolefins at the gas phase and liquid/solid phase contacting modes
Synergistic effects during co-pyrolysis of milled wood lignin and polyolefins at the gas phase and liquid/solid phase contacting modes
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DOI：
10.1016/j.cej.2021.134030
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发表时间：
2022-03-01
影响因子：
15.1
通讯作者：
Yoshioka, Toshiaki
中科院分区：
文献类型：
--
作者：
Ma, Chuan;Xie Shengyu;Yoshioka, Toshiaki
生物质和废塑料的共热解是提高燃料和有价值化学品生产的首选技术。本文采用热重分析（TG）、逸出气体分析-质谱（EGA-MS）和产物回收试验研究了不同质量比的木质素（MWL）与聚乙烯（PE）和聚丙烯（PP）的共热解。采用液/固相（LSP）和气相（GP）接触两种反应模式，研究了熔融聚合物对气化中间体间相互作用的物理阻止作用。热重分析结果表明，MWL/PE共混物的失重略有变化，MWL/PP共混物的热分解有所延迟，而EGA-MS分析表明，MS检测到更多的汽化产物。固定床实验表明，随着共混物中PE或PP比例的增加，液体产率大大提高。主要是由于由聚烯烃形成低级低聚烃。在GP模式下，MWL分别与PE和PP共热解，汽油和煤油的产率显著增加。这些结果表明，MWL热解产物在GP反应模式下可以促进PE中间体的裂解，而在LSP反应模式下可以抑制PP中间体的重排反应，使更多的蜡产物转化为液体。本文提供了一个更好地了解详细的协同效应，在生物质和塑料共热解。
Co-pyrolysis of biomass and waste plastics is the preferred technology for enhancing the production of fuels and valuable chemicals. Here, we studied the co-pyrolysis of milled wood lignin (MWL) with polyethylene (PE) and polypropylene (PP) at various weight ratios by thermogravimetry (TG), evolved gas analysis-mass spectrometry (EGA-MS), and product recovery tests using a fixed-bed reactor. Two reaction modes, liquid/solid phase (LSP) and gas phase (GP) contacting modes, were applied to investigate the physical prevention of melted polymers on the interactions between the vapored intermediates. The TG results showed that the weight losses were slightly altered in the MWL/PE and the decomposition was delayed in MWL/PP blends, whereas the EGA-MS analysis indicated that more vaporized products from the blends were detected by MS. The fixed-bed experiments showed that the yield of liquid was largely enhanced by the higher proportion of PE or PP in the blends, primarily due to the formation of lower oligomeric hydrocarbons from polyolefins. The yields of gasoline and kerosene were significantly increased in the GP mode from the co-pyrolysis of MWL with PE and PP, respectively. These results suggest that the MWL pyrolysates could enhance the cracking of PE intermediates in the GP reaction mode, whereas the rearrangement reactions of PP intermediates may be inhibited in the LSP reaction mode, converting more wax products into liquid. This paper provides a better understanding of the detailed synergistic effects during biomass and plastics co-pyrolysis.