Effects of a New Synthetic Ionic Liquid on Caking Properties of Coals with Three Different Ranks

IF 0.4 Q4 ENGINEERING, CHEMICAL Coke and Chemistry Pub Date : 2024-05-13 DOI:10.3103/S1068364X2460012X

Yuan Fang, Kangshun Han, Ying Chen, Shulin Wang, Zhigang Zhao, Xiangchun Liu, Ping Cui

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Abstract

To reveal the molecular structure characteristics of the caking components in coal, three coals with different ranks were treated using a new synthetic ionic liquid (i.e., [N₄₄₄₁][NO₃]), the combination of which is based on the effect degree of different anions and cations of ionic liquids on the caking properties of the coals. Additionally, the raw and treated coals were characterized using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman. The results showed that the caking index (G) values of the coals decreased after [N₄₄₄₁][NO₃] treatment, and the destruction degree decreased with increasing coal rank. The decrease in G is related to the removal of some species during [N₄₄₄₁][NO₃] treatment. FTIR and Raman showed that aromatics with 3 or more rings but less than that in graphite and long-chain aliphatics were removed. XRD showed that [N₄₄₄₁][NO₃] treatment decreased the graphitization degrees of the coals. Additionally, a mechanism of destroying the caking property of coal using [N₄₄₄₁][NO₃] is proposed. [N₄₄₄₁][NO₃] treatment could decrease the contents of aromatics with 3 or more rings but less than that in graphite and long-chain aliphatics. Consequently, the caking property of coal is destroyed.

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新型合成离子液体对三种不同等级煤结块特性的影响

摘要为揭示煤中结块成分的分子结构特征，采用新型合成离子液体（即[N4441][NO3]）处理了三种不同等级的煤炭，其组合是基于离子液体中不同阴阳离子对煤炭结块特性的影响程度。此外，还使用傅立叶变换红外光谱（FTIR）、X 射线衍射（XRD）、X 射线光电子能谱（XPS）和拉曼光谱对原煤和处理过的煤进行了表征。结果表明，经[N4441][NO3]处理后，煤炭的结块指数（G）值降低，且破坏程度随煤炭等级的增加而降低。G 值的降低与[N4441][NO3]处理过程中某些物质的去除有关。傅立叶变换红外光谱（FTIR）和拉曼光谱（Raman）显示，具有 3 个或 3 个以上环但少于石墨中环数的芳烃和长链脂肪烃被去除。XRD 显示，[N4441][NO3] 处理降低了煤的石墨化程度。此外，还提出了利用[N4441][NO3]破坏煤的结块特性的机理。经[N4441][NO3]处理后，3 个或 3 个以上环的芳烃含量降低，但低于石墨和长链脂肪烃的含量。因此，煤的结块特性被破坏。

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来源期刊

Coke and Chemistry ENGINEERING, CHEMICAL-

CiteScore

0.70

自引率

50.00%

发文量

期刊介绍： The journal publishes scientific developments and applications in the field of coal beneficiation and preparation for coking, coking processes, design of coking ovens and equipment, by-product recovery, automation of technological processes, ecology and economics. It also presents indispensable information on the scientific events devoted to thermal rectification, use of smokeless coal as an energy source, and manufacture of different liquid and solid chemical products.