聚对苯二甲酸乙二醇酯废渣的热解聚及其在配煤炼焦中的应用

Q3 Energy

燃料化学学报 Pub Date : 2025-04-01 DOI:10.1016/S1872-5813(24)60504-9

Shixian FANG, Huan SONG, Xiangchun LIU, Ping CUI

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引用次数: 0

摘要

本研究提出了一种提高聚对苯二甲酸乙二醇酯（PET）废弃物结块指数的策略，即采用低温热解处理（LTPT）对PET废弃物进行解聚。结合热重分析（TG）、傅里叶变换红外光谱、热解-气相色谱-质谱检测和固态13C核磁共振谱分析，揭示了G改性的机理。此外，还利用工业混煤进行了坩埚炼焦实验，并对PET进行了最佳G （PET300）或生PET处理，以评价PET废弃物在配煤炼焦中的适用性。从焦炭反应活性（CR）、反应后焦炭强度（CSR）指标、tg相关曲线、孔隙体积、拉曼光谱表征结果来看，LTPT能显著提高PET的G，最佳温度为300℃。其中，与PET共混制焦相比，PET300共混制焦的CR降低了4.9%，CSR提高了7.4%，表明LTPT可以提高PET用于配煤炼焦的比例。G的提高是由于LTPT引起的C - O/C=O比值、脂肪H和芳香性的变化。

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Thermal depolymerization of polyethylene terephthalate waste and its use in coal-blending coking

This work proposed a strategy to improve the caking index of polyethylene terephthalate (PET) waste, in which low-temperature pyrolysis treatment (LTPT) was used to depolymerize PET waste. The mechanism of G modification was revealed combining thermogravimetric (TG) analysis, Fourier transform infrared spectroscopy, pyrolysis-gas chromatography with mass spectrometric detection, and solid-state ¹³C nuclear magnetic resonance spectroscopy. Furthermore, crucible coking experiments were also conducted using industrial coal mixture and treated PET with the optimum G (PET300) or raw PET to evaluate the applicability of PET waste in coal-blending coking. According to characterization results of coke reactivity (CR), coke strength after reaction (CSR) indices, TG-related curves, pore volumes, and Raman spectra of the resultant cokes, LTPT could greatly increase the G of PET, and the optimum temperature was 300 °C. Specifically, compared with the coke obtained from the blend with PET, the CR of the coke produced from the blend with PET300 decreased by 4.9%, whereas the CSR of the increased by 7.4%, suggesting that LTPT could increase the proportion of PET used for coal-blending coking. The improvement in G is attributed to the changes in C‒O/C=O ratio, aliphatic H and aromaticity caused by LTPT.

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来源期刊

燃料化学学报 Chemical Engineering-Chemical Engineering (all)

CiteScore

2.80

自引率

0.00%

发文量

5825

期刊介绍： Journal of Fuel Chemistry and Technology (Ranliao Huaxue Xuebao) is a Chinese Academy of Sciences(CAS) journal started in 1956, sponsored by the Chinese Chemical Society and the Institute of Coal Chemistry, Chinese Academy of Sciences(CAS). The journal is published bimonthly by Science Press in China and widely distributed in about 20 countries. Journal of Fuel Chemistry and Technology publishes reports of both basic and applied research in the chemistry and chemical engineering of many energy sources, including that involved in the nature, processing and utilization of coal, petroleum, oil shale, natural gas, biomass and synfuels, as well as related subjects of increasing interest such as C1 chemistry, pollutions control and new catalytic materials. Types of publications include original research articles, short communications, research notes and reviews. Both domestic and international contributors are welcome. Manuscripts written in Chinese or English will be accepted. Additional English titles, abstracts and key words should be included in Chinese manuscripts. All manuscripts are subject to critical review by the editorial committee, which is composed of about 10 foreign and 50 Chinese experts in fuel science. Journal of Fuel Chemistry and Technology has been a source of primary research work in fuel chemistry as a Chinese core scientific periodical.