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Investigations of coal beneficiation by using choline chloride and urea-based deep eutectic solvent
International Journal of Coal Preparation and Utilization ( IF 2.0 ) Pub Date : 2022-03-11 , DOI: 10.1080/19392699.2022.2051017
Ankur Dwivedi 1 , Arpita Dwivedi 2 , Amrendra Kumar 1
Affiliation  

ABSTRACT

The present study reports on the interaction, influence, and dissolution properties of coal samples (CS) by a green solvent, deep eutectic solvent (DES), prepared from choline chloride and urea. The bituminous coal has been collected from the Singrauli coalfield in India. DES was synthesized using urea as a hydrogen bond acceptor (HA) and choline chloride as a hydrogen bond donor (HD) in an equimolar amount. The synthesized DES has been used in the study for swelling behavior, proximate and ultimate analysis, and FTIR to understand the beneficiation of coal after DES treatment. The swelling index of DES-treated coal ranges from 1.12 to 1.43 when compared to raw CS. FTIR confirms the presence of different oxygen-containing phenolic, aromatic, and aliphatic hydrocarbon containing functional groups present in coal samples. Quantitative analysis of FTIR peaks was carried out through the Gaussian function peak processing method. Fourier transform infrared (FTIR) analysis of the raw coal and treated sample confirms the reduction of oxygen-carrying and phenolic vibrational groups by up to 86%. The ultimate and proximate analysis of raw coal and DES-treated CS shows the decrease in ash content (up to 26%) of DES-treated coal samples and confirms the FTIR results. Calorific value in the form of fixed carbon content was also increased by up to 4.7% after DES treatment. Hence, DES treatment efficiently benefits coal properties and makes them more useful for the industrial environment.



中文翻译:

氯化胆碱与尿素基低共熔溶剂选煤研究

摘要

本研究报告了由氯化胆碱和尿素制备的绿色溶剂、低共熔溶剂 (DES) 对煤样 (CS) 的相互作用、影响和溶解特性。烟煤采自印度的 Singrauli 煤田。使用等摩尔量的尿素作为氢键受体 (HA) 和氯化胆碱作为氢键供体 (HD) 合成 DES。合成的 DES 已用于溶胀行为研究、近似分析和元素分析,以及 FTIR 以了解 DES 处理后煤的选矿情况。与原料 CS 相比,经 DES 处理的煤的膨胀指数范围为 1.12 至 1.43。FTIR 证实了煤样中存在不同的含氧酚类、芳香族和脂肪族烃官能团。通过高斯函数峰处理方法对FTIR峰进行定量分析。原煤和处理过的样品的傅里叶变换红外 (FTIR) 分析证实,携带氧和酚类振动基团减少了高达 86%。原煤和经 DES 处理的 CS 的最终和近似分析显示经 DES 处理的煤样的灰分含量降低(高达 26%),并证实了 FTIR 结果。在 DES 处理后,固定碳含量形式的热值也增加了 4.7%。因此,DES 处理有效地有益于煤的特性,并使它们对工业环境更有用。原煤和处理过的样品的傅里叶变换红外 (FTIR) 分析证实,携带氧和酚类振动基团减少了高达 86%。原煤和经 DES 处理的 CS 的最终和近似分析显示经 DES 处理的煤样的灰分含量降低(高达 26%),并证实了 FTIR 结果。在 DES 处理后,固定碳含量形式的热值也增加了 4.7%。因此,DES 处理有效地有益于煤的特性,并使它们对工业环境更有用。原煤和处理过的样品的傅里叶变换红外 (FTIR) 分析证实,携带氧和酚类振动基团减少了高达 86%。原煤和经 DES 处理的 CS 的最终和近似分析显示经 DES 处理的煤样的灰分含量降低(高达 26%),并证实了 FTIR 结果。在 DES 处理后,固定碳含量形式的热值也增加了 4.7%。因此,DES 处理有效地有益于煤的特性,并使它们对工业环境更有用。在 DES 处理后,固定碳含量形式的热值也增加了 4.7%。因此,DES 处理有效地有益于煤的特性,并使它们对工业环境更有用。在 DES 处理后,固定碳含量形式的热值也增加了 4.7%。因此,DES 处理有效地有益于煤的特性,并使它们对工业环境更有用。

更新日期:2022-03-11
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