Polyethylene high-pressure pyrolysis: Better product distribution and process mechanism analysis

doi:10.1016/j.cej.2019.123866

	Polyethylene high-pressure pyrolysis: Better product distribution and process mechanism analysis
	Cheng, Leilei 1,2,3,4; Gu, Jing 1,2,3; Wang, Yazhuo 1,2,3; Zhang, Jun 1,2,3; Yuan, Haoran 1,2,3; Chen, Yong 1,2,3
刊名	CHEMICAL ENGINEERING JOURNAL
	2020-04-01
卷号	385 页码:11
关键词	Polyethylene High-pressure pyrolysis Microscopic mechanism Radical
ISSN号	1385-8947
DOI	10.1016/j.cej.2019.123866
通讯作者	Yuan, Haoran(yuanhr@ms.giec.ac.cn)
英文摘要	Pyrolysis is currently an effective way to recycle plastics. High-pressure conditions can change the pyrolysis product component distribution, but the microscopic mechanism has not been well elucidated. To explore the relationship of product distribution versus pressure and explain the microscopic mechanism of polyethylene high-pressure pyrolysis, experiments under a large initial pressure range from 1 bar to 51 bar at initial temperatures of 330-380 degrees C were carried out in an autoclave. In the process of polyethylene high-pressure pyrolysis, the temperature within the reactor exceeded the set temperature by 100 degrees C at a rate of 150 degrees C/min. The thermal runaway phenomenon was caused by the polymerization of concentrated olefins in liquid form, which was initiated by hydrocarbon radicals. As the pressure increased, the reaction peak temperature was risen and more small molecules were produced. Under an initial temperature of 340 degrees C and high-pressure conditions, polyethylene was completely converted into liquid and gas products. The experimental results also revealed that high-pressure conditions led to the production of aromatic compounds and isoparaffins, as well as more cycloalkanes and fewer olefins in the liquid product, making the product characteristics closer to the fuel standard. Finally, this paper proposes the radical microscopic mechanisms of polyethylene thermal degradation under atmospheric-pressure and high-pressure conditions.
资助项目	National Key Research and Development Program of China[2018YFC1901200] ; National Natural Science Foundation of China[51606202] ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)[GML2019ZD0101] ; Science and Technology Planning Project of Guangzhou[201904010351] ; Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences[ISEE2018YB04]
WOS关键词	CATALYTIC FLASH PYROLYSIS ; THERMAL/CATALYTIC CRACKING ; PLASTIC WASTE ; HYDROCARBONS ; DEGRADATION ; MICROPLASTICS ; EVOLUTION ; RECOVERY ; OLEFINS ; REACTOR
WOS研究方向	Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000507465200117
资助机构	National Key Research and Development Program of China ; National Natural Science Foundation of China ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) ; Science and Technology Planning Project of Guangzhou ; Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.giec.ac.cn/handle/344007/26334]
专题	中国科学院广州能源研究所
通讯作者	Yuan, Haoran
作者单位	1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Peoples R China 2.CAS Key Lab Renewable Energy, Guangzhou 510640, Peoples R China 3.Guangdong Prov Key Lab New & Renewable Energy Res, Guangzhou 510640, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Cheng, Leilei,Gu, Jing,Wang, Yazhuo,et al. Polyethylene high-pressure pyrolysis: Better product distribution and process mechanism analysis[J]. CHEMICAL ENGINEERING JOURNAL,2020,385:11.
APA	Cheng, Leilei,Gu, Jing,Wang, Yazhuo,Zhang, Jun,Yuan, Haoran,&Chen, Yong.(2020).Polyethylene high-pressure pyrolysis: Better product distribution and process mechanism analysis.CHEMICAL ENGINEERING JOURNAL,385,11.
MLA	Cheng, Leilei,et al."Polyethylene high-pressure pyrolysis: Better product distribution and process mechanism analysis".CHEMICAL ENGINEERING JOURNAL 385(2020):11.