Intrinsic Millisecond Kinetics of Polyethylene Pyrolysis via Pulse-Heated Analysis of Solid Reactions
Intrinsic Millisecond Kinetics of Polyethylene Pyrolysis via Pulse-Heated Analysis of Solid Reactions
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DOI：
10.1021/acs.chemmater.3c00256
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发表时间：
2023-05
影响因子：
8.6
通讯作者：
Isaac Mastalski;Nathan Sidhu;A. Zolghadr;S. Maduskar;Bryan A. Patel;S. Uppili;Tony Go;Ziwei Wang;M. Neurock;Paul J. Dauenhauer
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作者：
Isaac Mastalski;Nathan Sidhu;A. Zolghadr;S. Maduskar;Bryan A. Patel;S. Uppili;Tony Go;Ziwei Wang;M. Neurock;Paul J. Dauenhauer
.聚烯烃的持续需求可以通过在热解反应器中通过热裂解将塑料材料再循环回其组成单体乙烯和丙烯来满足。在热解过程中，饱和聚烯烃链断裂碳-碳和碳-氢键，在400-800 °C的温度下产生烷烃、烯烃、芳香族化学品、轻质气体和固体炭残留物的分布。为了设计优化化学以获得最大轻质烯烃产率的热解反应器，需要详细描述化学机理和相关动力学。为此，低密度聚乙烯（LDPE）的等温膜的反应动力学已经通过“固体反应的脉冲加热分析”或PHASR的方法测量，该方法允许通过等温反应控制的实验条件来量化本征动力学。LDPE膜在五种温度（550、575、600、625 ℃）下从20毫秒到2.0秒的演变
. Continued demand for polyolefins can be met by recycling plastic materials back to their constituent monomers, ethylene and propylene, via thermal cracking in a pyrolysis reactor. During pyrolysis, saturated polyolefin chains break carbon-carbon and carbon-hydrogen bonds, yielding a distribution of alkanes, alkenes, aromatic chemicals, light gases, and solid char residue at temperatures varying from 400-800 °C. To design a pyrolysis reactor that optimizes the chemistry for maximum yield of light olefins, a detailed description of the chemical mechanisms and associated kinetics is required. To that end, the reaction kinetics of isothermal films of low-density polyethylene (LDPE) have been measured by the method of ‘Pulse-Heated Analysis of Solid Reactions,’ or PHASR, which allows for quantification of intrinsic kinetics via isothermal reaction-controlled experimental conditions. The evolution of LDPE films from 20 milliseconds to 2.0 seconds for five temperatures (550, 575, 600, 625