Study on mild cracking of polyolefins to liquid hydrocarbons in a closed batch reactor for subsequent olefin recovery

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	Study on mild cracking of polyolefins to liquid hydrocarbons in a closed batch reactor for subsequent olefin recovery
	Jing, Xiaodong 1,2; Yan, Guoxun 1,3; Zhao, Yuehong 1; Wen, Hao 1; Xu, Zhihong 1
刊名	POLYMER DEGRADATION AND STABILITY
	2014-11-01
卷号	109 期号:S1 页码:79-91
关键词	Mild cracking Polyolefins Monomer recovery Two-step method
ISSN号	0141-3910
其他题名	Polym. Degrad. Stabil.
中文摘要	The polyolefins mild cracking experiments have been carried out in a closed batch reactor under inert nitrogen atmosphere over a temperature range from 370 degrees C to 420 degrees C and the characterization of the mild cracking products has been investigated. The objective of this work is to study the cracking mechanism and reaction path for the mild cracking of polyolefins with lower heating rate (the isothermal and non-isothermal process), and to find the appropriate operating conditions (temperature and residence time) for optimal yield of liquid hydrocarbons (oils/waxes) as the suitable feedstock of olefin recovery. The advantages of this work can be summarized as high yield of light fraction, low aromatics content and mild cracking conditions. More viscosity-reducing and less volatiles-loss can be simultaneously achieved in mild cracking of polyolefins by selecting the reasonable residence time-temperature combination. The results confirm that chain scission reactions are significantly predominant in these experimental conditions. Intramolecular hydrogen transfer and intermolecular hydrogen transfer, which are responsible for the reduction in molecular weight of liquid products, can be improved in lower temperature and longer residence time, and intermolecular hydrogen transfer can also be enhanced in the PE/PP mixture cracking. For polyolefins mixture cracking, the cracking temperature can be reduced about 20 degrees C, or the cracking time can be shortened significantly, and so utilizing the whole polyolefins mixture without a need of further separation is very desirable in the chemical recycling. (C) 2014 Elsevier Ltd. All rights reserved.
英文摘要	The polyolefins mild cracking experiments have been carried out in a closed batch reactor under inert nitrogen atmosphere over a temperature range from 370 degrees C to 420 degrees C and the characterization of the mild cracking products has been investigated. The objective of this work is to study the cracking mechanism and reaction path for the mild cracking of polyolefins with lower heating rate (the isothermal and non-isothermal process), and to find the appropriate operating conditions (temperature and residence time) for optimal yield of liquid hydrocarbons (oils/waxes) as the suitable feedstock of olefin recovery. The advantages of this work can be summarized as high yield of light fraction, low aromatics content and mild cracking conditions. More viscosity-reducing and less volatiles-loss can be simultaneously achieved in mild cracking of polyolefins by selecting the reasonable residence time-temperature combination. The results confirm that chain scission reactions are significantly predominant in these experimental conditions. Intramolecular hydrogen transfer and intermolecular hydrogen transfer, which are responsible for the reduction in molecular weight of liquid products, can be improved in lower temperature and longer residence time, and intermolecular hydrogen transfer can also be enhanced in the PE/PP mixture cracking. For polyolefins mixture cracking, the cracking temperature can be reduced about 20 degrees C, or the cracking time can be shortened significantly, and so utilizing the whole polyolefins mixture without a need of further separation is very desirable in the chemical recycling. (C) 2014 Elsevier Ltd. All rights reserved.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Polymer Science
研究领域[WOS]	Polymer Science
关键词[WOS]	HIGH-DENSITY POLYETHYLENE ; FLUIDIZED-BED REACTOR ; THERMAL-DEGRADATION ; POLYPROPYLENE PP ; PLASTIC WASTES ; TEMPERATURE PYROLYSIS ; MIXED-PLASTICS ; LIGHT OLEFINS ; CO-PYROLYSIS ; PRODUCTS
收录类别	SCI
原文出处	://WOS:000345472900011
语种	英语
WOS记录号	WOS:000345472900011
公开日期	2015-04-01
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/11764]
专题	过程工程研究所_研究所（批量导入）
作者单位	1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Qingdao Univ Sci & Technol, Hitech Inst Petr & Chem Ind, Qingdao 266042, Shandong, Peoples R China
推荐引用方式 GB/T 7714	Jing, Xiaodong,Yan, Guoxun,Zhao, Yuehong,et al. Study on mild cracking of polyolefins to liquid hydrocarbons in a closed batch reactor for subsequent olefin recovery[J]. POLYMER DEGRADATION AND STABILITY,2014,109(S1):79-91.
APA	Jing, Xiaodong,Yan, Guoxun,Zhao, Yuehong,Wen, Hao,&Xu, Zhihong.(2014).Study on mild cracking of polyolefins to liquid hydrocarbons in a closed batch reactor for subsequent olefin recovery.POLYMER DEGRADATION AND STABILITY,109(S1),79-91.
MLA	Jing, Xiaodong,et al."Study on mild cracking of polyolefins to liquid hydrocarbons in a closed batch reactor for subsequent olefin recovery".POLYMER DEGRADATION AND STABILITY 109.S1(2014):79-91.