Thermal pyrolysis of high density polyethylene (HDPE) in a novel fixed bed reactor system for the production of high value gasoline range hydrocarbons (HC)
Thermal pyrolysis of high density polyethylene (HDPE) in a novel fixed bed reactor system for the production of high value gasoline range hydrocarbons (HC)
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DOI：
10.1016/j.psep.2019.05.008
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发表时间：
2019-07-01
影响因子：
7.8
通讯作者：
Al-Salem, S. M.
中科院分区：
文献类型：
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作者：
Al-Salem, S. M.
热解是从塑料固体废物中高产率回收有价值的石油和轻烃的一种很有前途的热解技术。本工作在一种新型固定床(间歇)反应器中进行了高密度聚乙烯(HDPE)的热裂解反应，目的是生产汽油馏分烃油。HDPE在500至800摄氏度之间，在氮气作为惰性载气介质的情况下进行热解，以产生液体燃料油、气态产品和固体焦。获得最大石油产品产率(70%)的最佳温度为550℃。对液体和气体产品进行了全面的气相色谱(GC)分析，以定量高相对分子质量的单个HC组分。此外，还鉴定了组成气态组分的轻分子量Hc。对裂化反应进行了化学动力学分析，探讨了裂化反应生成最大油品的反应机理。回收的油品中脂肪族碳氢化合物比例较高，特别是在C-8~C-12范围内，而芳香族碳氢化合物所占比例较低。结果表明，随着操作温度的升高，裂解油的碳数呈比例增加。气态产物中C-2到C-4HC的比例较高(>；70%)，这归因于C/C(C-C)断链反应的高活性。(C)2019年化学工程师学会。爱思唯尔出版，版权所有。
Pyrolysis is a promising thermolysis technique to recover valuable oils and light hydrocarbons (HC) with high yields from plastic solid waste (PSW). In this work, thermal pyrolysis of high density polyethylene (HDPE) with the aim of producing gasoline range hydrocarbon oils, has been carried out in a novel fixed bed (batch) reactor. The pyrolysis of HDPE has been conducted between 500 to 800 degrees C in the presence of nitrogen as an inert carrier gas media to produce liquid fuel oil, gaseous products and solid char. The optimum temperature of obtaining maximum oil product yield (70%) was 550 degrees C. A comprehensive gas chromatography (GC) analysis of the liquid and gaseous products was conducted to quantify high molecular weight individual HC components. Moreover, light molecular weight HC constituting the gaseous fraction were identified. A chemical kinetic analysis of the cracking reactions, was performed to investigate the reaction mechanism of yielding the maximum oil product. The oil product recovered had a high proportion of aliphatic HC especially in the range of C-8 to C-12, whilst aromatic HC were of lower proportion. The carbon number of the pyrolysis oil was noted to increase proportionally with the increasing operating temperature. The gaseous product had a high percentage (> 70%) of C-2 to C-4 HC, which was attributed to the high activity of carbon/carbon (C-C) chain scission reaction. (C) 2019 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.