Separation and analysis of six fractions in low temperature coal tar by column chromatography

doi:10.1016/j.cjche.2022.12.002

中国化学工程学报 ›› 2023, Vol. 58 ›› Issue (6): 256-265.DOI: 10.1016/j.cjche.2022.12.002

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Separation and analysis of six fractions in low temperature coal tar by column chromatography

Shuangtai Liu¹, Lei He¹, Qiuxiang Yao^1,2, Xi Li¹, Linyang Wang¹, Jing Wang², Ming Sun¹, Xiaoxun Ma¹

1. School of Chemical Engineering, Northwest University, International Science & Technology Cooperation Base of MOST for Clean Utilization of Hydrocarbon Resources, Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy, Shaanxi Research Center of Engineering Technology for Clean Coal Conversion, Collaborative Innovation Center for Development of Energy and Chemical Industry in Northern, Xi'an 710069, China;
2. School of Electronic Information, Xijing University, Xi'an Key Laboratory of Advanced Photo-electronics Materials and Energy Conversion Device, Xi'an 710123, China

收稿日期:2022-10-07 修回日期:2022-12-05 出版日期:2023-06-28 发布日期:2023-08-31
通讯作者: Xiaoxun Ma,E-mail:maxym@nwu.edu.cn
基金资助:
This work was financed by the project supported by the National Natural Science Foundation of China (22078266, 21908180, 22178289, 22278338), the Key Research and Development Program of Shaanxi (2020ZDLGY11-02, 2021GY-136) and the Special Fund for High-level Scholars of China (XJ21B10).

Separation and analysis of six fractions in low temperature coal tar by column chromatography

Shuangtai Liu¹, Lei He¹, Qiuxiang Yao^1,2, Xi Li¹, Linyang Wang¹, Jing Wang², Ming Sun¹, Xiaoxun Ma¹

1. School of Chemical Engineering, Northwest University, International Science & Technology Cooperation Base of MOST for Clean Utilization of Hydrocarbon Resources, Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy, Shaanxi Research Center of Engineering Technology for Clean Coal Conversion, Collaborative Innovation Center for Development of Energy and Chemical Industry in Northern, Xi'an 710069, China;
2. School of Electronic Information, Xijing University, Xi'an Key Laboratory of Advanced Photo-electronics Materials and Energy Conversion Device, Xi'an 710123, China

Received:2022-10-07 Revised:2022-12-05 Online:2023-06-28 Published:2023-08-31
Contact: Xiaoxun Ma,E-mail:maxym@nwu.edu.cn
Supported by:
This work was financed by the project supported by the National Natural Science Foundation of China (22078266, 21908180, 22178289, 22278338), the Key Research and Development Program of Shaanxi (2020ZDLGY11-02, 2021GY-136) and the Special Fund for High-level Scholars of China (XJ21B10).

摘要/Abstract

摘要： The low temperature coal tar (CT) is taken as the raw material, and the extraction and column chromatography are used for detailed and accurate characterization in this paper. The n-heptane soluble fraction (CT-HS) and insoluble fraction (CT-HI) were obtained by n-heptane Soxhlet extraction. The extraction rate of CT-HS reached 92.79% (mass), which indicated that there are few heavy compounds in it. Further, different solvents (methylbenzene, benzene, ethyl acetate, methylbenzene-ethanol) were used to elute CT-HS by chromatographic column to obtain five fractions (saturates, aromatics, heteroatoms, phenolics and resins, named CT-SA, CT-AR, CT-HE, CT-PH, CT-RE, respectively). The yields of CT-SA, CT-AR, CT-HE, CT-PH, CT-RE are 42.12%, 10.43%, 2.19%, 9.50% and 6.63% (mass), respectively. Gas chromatography-mass spectrometry analysis of eluting components show that alkanes are the main components in CT, followed by polycyclic aromatics, and the corresponding fractions are CT-SA and CT-AR, respectively. The relative content of aliphatics in CT-SA is 76.93%, and the relative content of aromatics in CT-AR is 75.05%. This separation technology effectively separates and enriches different components in CT, and the activation energy required for the pyrolysis process of a single eluting fraction is lower than that of CT, which is expected to provide an important reference for the separation, analysis and conversion of complex oil products such as coal-oil co-processing products, coal tar and other complex heavy carbon oil products.

关键词: Low temperature coal tar, Extractive separation, Column chromatography isolation, Chromatography/mass spectrometry

Abstract: The low temperature coal tar (CT) is taken as the raw material, and the extraction and column chromatography are used for detailed and accurate characterization in this paper. The n-heptane soluble fraction (CT-HS) and insoluble fraction (CT-HI) were obtained by n-heptane Soxhlet extraction. The extraction rate of CT-HS reached 92.79% (mass), which indicated that there are few heavy compounds in it. Further, different solvents (methylbenzene, benzene, ethyl acetate, methylbenzene-ethanol) were used to elute CT-HS by chromatographic column to obtain five fractions (saturates, aromatics, heteroatoms, phenolics and resins, named CT-SA, CT-AR, CT-HE, CT-PH, CT-RE, respectively). The yields of CT-SA, CT-AR, CT-HE, CT-PH, CT-RE are 42.12%, 10.43%, 2.19%, 9.50% and 6.63% (mass), respectively. Gas chromatography-mass spectrometry analysis of eluting components show that alkanes are the main components in CT, followed by polycyclic aromatics, and the corresponding fractions are CT-SA and CT-AR, respectively. The relative content of aliphatics in CT-SA is 76.93%, and the relative content of aromatics in CT-AR is 75.05%. This separation technology effectively separates and enriches different components in CT, and the activation energy required for the pyrolysis process of a single eluting fraction is lower than that of CT, which is expected to provide an important reference for the separation, analysis and conversion of complex oil products such as coal-oil co-processing products, coal tar and other complex heavy carbon oil products.

Key words: Low temperature coal tar, Extractive separation, Column chromatography isolation, Chromatography/mass spectrometry

Shuangtai Liu, Lei He, Qiuxiang Yao, Xi Li, Linyang Wang, Jing Wang, Ming Sun, Xiaoxun Ma. Separation and analysis of six fractions in low temperature coal tar by column chromatography[J]. 中国化学工程学报, 2023, 58(6): 256-265.

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Separation and analysis of six fractions in low temperature coal tar by column chromatography

Separation and analysis of six fractions in low temperature coal tar by column chromatography

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