Modification mechanism of caking property of polystyrene waste using low-temperature pyrolysis and its use in coal-blending coking  

作　　者：Xiangchun Liu Ying Chen Huan Song Ping Cui 

机构地区：[1]Anhui Province Key Laboratory of Coal Clean Conversion&High Valued Utilization,School of Chemistry and Chemical Engineering,Anhui University of Technology,Ma'anshan 243032,China

出　　处：《Chinese Journal of Chemical Engineering》2025年第1期93-101,共9页中国化学工程学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(22308006 and 22278001);the Natural Science Foundation of Anhui Provincial Education Department(KJ2021A0407).

摘　　要：Polystyrene(PS)waste was depolymerized using a low-temperature pyrolysis treatment(LTPT)to increase its caking index.The mechanism of caking index modification was revealed by using Fourier transform infrared spectroscopy,thermogravimetric(TG)analysis,pyrolysis-gas chromatography with mass spectrometric detection,and solid-state^(13)C nuclear magnetic resonance spectroscopy.The crucible coal-blending coking tests were carried out using an industrial coal mixture and the treated-PS with the highest caking index(PS300)or raw PS.Some properties of the resultant cokes were also analyzed.It was demonstrated that the caking index of PS dramatically increased by LTPT;however,exceeding 300℃ did not yield any benefit.The caking index increased due to the formation of the caking components,whose molecules are medium in size,caused by LTPT.Additionally,the coke reactivity index of the coke obtained from the mixture containing PS300 decreased by 5.1%relative to that of the coke made from the mixture with PS and the coke strength after reaction index of the former increased by 7.3% compared with that of the latter,suggesting that the ratio of depolymerized PS used for coal-blending coking could increase relative to that of PS.

关 键 词：POLYSTYRENE PYROLYSIS Caking index Coking property 

分 类 号：O63[理学—高分子化学]