PET pyrolysis and hydrolysis mechanism in the fixed pyrolyzer
文献类型：期刊论文
| 作者 | Song, Kuntong1,6; Li, Yi1,3; Huo, Feng1,5; Liu, Junhong1; Hou, Wenxia1,5; Wang, Nan1,4; Zhou, Qing1,5; Xu, Junli1,2; Lu, Xingmei1,4,5,6 |
| 刊名 | CANADIAN JOURNAL OF CHEMICAL ENGINEERING
 |
| 出版日期 | 2023-01-23 |
| 页码 | 14 |
| 关键词 | char hydrogen transfer polyethylene terephthalate steam-assisted pyrolysis terephthalic acid |
| ISSN号 | 0008-4034 |
| DOI | 10.1002/cjce.24781 |
| 英文摘要 | In the conventional polyethylene terephthalate (PET) pyrolysis process, the formation of char by excessive pyrolysis is mainly due to the dehydration mechanism, so water is considered an auxiliary agent that can effectively inhibit excessive pyrolysis. The preparation of terephthalic acid (TPA) by steam-assisted pyrolysis of PET is an effective method to achieve closed-loop recycling of waste PET. To ensure that the reaction is mild enough to reduce excessive cracking products such as char and benzoic acid and thus increase the yield of TPA, it is critical to reduce the reaction rate while maintaining a sufficient excess steam coefficient. Under the optimal operating conditions, when the temperature rise rate was 0.5 degrees C min(-1) and the excess steam coeffi-cient was 150, the yield of TPA was 72.5 wt.%, and the purity was 85.5%. Noticeably, the steam-assisted pyrolysis system is a heterogeneous reaction sys-tem whose reaction mechanism is different from the conventional hydrolysis and pyrolysis reactions and has a unique reaction path. The mechanistic study indicates that, in addition to the thermal cracking of PET molecules occurring in conventional pyrolysis, hydroxyl attack and transfer, and supplementation of benzene ring hydrogen also occur between water and intermediate mole-cules. Meanwhile, it has also been proven that the intermolecular hydrogen transfer between intermediate molecules and water molecules is the key to reduce the intensity of the reaction and inhibit the formation of char. This dis-covery illustrates the mechanism of the reaction between water and PET in the steam-assisted pyrolysis process in the fixed pyrolyzer and justifies the distinc-tion between it and the pyrolysis and hydrolysis processes of PET. It provides a theoretical basis for optimizing the pyrolysis process of PET, which is essential for the industrialization of TPA preparation from PET steam-assisted pyrolysis. |
| WOS关键词 | POLYETHYLENE TEREPHTHALATE ; FLUIDIZED-BED ; OIL-SHALE ; OPERATING-CONDITIONS ; POLY(ETHYLENE-TEREPHTHALATE) ; GASIFICATION ; STEAM ; METHANOLYSIS ; DEGRADATION ; BEHAVIOR |
| 资助项目 | National Key Research and Development Program of China[2019YFC1908204] ; National Key R&D Program of China[2019YFC1908204] ; National Natural Science Foundation of China[22178364] ; Strategic Priority Research Program[XDA 21060300] ; Innovation Academy for Green Manufacture, Chinese Academy of Sciences[IAGM2022D11] |
| WOS研究方向 | Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000932324900001 |
| 出版者 | WILEY |
| 资助机构 | National Key Research and Development Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; Strategic Priority Research Program ; Innovation Academy for Green Manufacture, Chinese Academy of Sciences |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/57066]  |
| 通讯作者 | Li, Yi; Lu, Xingmei |
| 作者单位 | 1.Chinese Acad Sci, Beijing Key Lab Ion Liquids Clean Proc, CAS Key Lab Green Proc & Engn, Inst Proc Engn,State Key Lab Multiphase Complex Sy, Beijing, Peoples R China 2.Chinese Acad Sci, Innovat Acad Green Manufacture Inst, Beijing, Peoples R China 3.Chinese Acad Sci, Beijing Key Lab Ion Liquids Clean Proc, CAS Key Lab Green Proc & Engn, Inst Proc Engn,State Key Lab Multiphase Complex Sy, Beijing 100190, Peoples R China 4.Zhengzhou Univ, Henan Inst Adv Technol, Zhengzhou, Peoples R China 5.Univ Chinese Acad Sci, Sch Chem Engn, Beijing, Peoples R China 6.Univ Chinese Acad Sci, Sino Danish Coll, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Song, Kuntong,Li, Yi,Huo, Feng,et al. PET pyrolysis and hydrolysis mechanism in the fixed pyrolyzer[J]. CANADIAN JOURNAL OF CHEMICAL ENGINEERING,2023:14. |
| APA | Song, Kuntong.,Li, Yi.,Huo, Feng.,Liu, Junhong.,Hou, Wenxia.,...&Lu, Xingmei.(2023).PET pyrolysis and hydrolysis mechanism in the fixed pyrolyzer.CANADIAN JOURNAL OF CHEMICAL ENGINEERING,14. |
| MLA | Song, Kuntong,et al."PET pyrolysis and hydrolysis mechanism in the fixed pyrolyzer".CANADIAN JOURNAL OF CHEMICAL ENGINEERING (2023):14. |
入库方式： OAI收割
来源：过程工程研究所
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