Characterization of nitrogen-containing aromatics in Baiyinhua lignite and its soluble portions from thermal dissolution

doi:10.1016/j.cjche.2019.06.001

Chinese Journal of Chemical Engineering ›› 2019, Vol. 27 ›› Issue (11): 2783-2787.DOI: 10.1016/j.cjche.2019.06.001

• Energy, Resources and Environmental Technology • Previous Articles Next Articles

Characterization of nitrogen-containing aromatics in Baiyinhua lignite and its soluble portions from thermal dissolution

Yangyang Zhang¹, Xianyong Wei^1,2, Jinghui Lü³, Hao Jiang¹, Fangjing Liu¹, Guanghui Liu¹, Zhimin Zong¹

1 Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, China University of Mining & Technology, Xuzhou 221116, China;
2 State Key Laboratory of High-efficiency Utilization and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China;
3 Department of Chemical Engineering, College of Chemical Engineering, Henan Polytechnic University, Jiaozuo 454003, China

Received:2018-08-12 Revised:2019-02-05 Online:2020-01-19 Published:2019-11-28
Contact: Xianyong Wei
Supported by:
Supported by the Key Project of Joint Fund from National Natural Science Foundation of China and the Government of Xinjiang Uygur Autonomous Region (U1503293), the National Key Research and Development Program of China (2018YFB0604602), and the Priority Academic Program Development of Jiangsu Higher Education Institutions.

Characterization of nitrogen-containing aromatics in Baiyinhua lignite and its soluble portions from thermal dissolution

Yangyang Zhang¹, Xianyong Wei^1,2, Jinghui Lü³, Hao Jiang¹, Fangjing Liu¹, Guanghui Liu¹, Zhimin Zong¹

1 Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, China University of Mining & Technology, Xuzhou 221116, China;
2 State Key Laboratory of High-efficiency Utilization and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China;
3 Department of Chemical Engineering, College of Chemical Engineering, Henan Polytechnic University, Jiaozuo 454003, China

通讯作者: Xianyong Wei
基金资助:
Supported by the Key Project of Joint Fund from National Natural Science Foundation of China and the Government of Xinjiang Uygur Autonomous Region (U1503293), the National Key Research and Development Program of China (2018YFB0604602), and the Priority Academic Program Development of Jiangsu Higher Education Institutions.

Abstract

Abstract: Soluble portions (SPs) 1-4 (SP₁-SP₄) were afforded from sequentially dissolution and alkanolyses of Baiyinhua lignite (BL) in cyclohexane, CH₃OH, CH₃CH₂OH, and (CH₃)₂CHOH at 300℃. They were analyzed with a gas chromatograph/mass spectrometer and quadrupole exactive orbitrap mass spectrometer (QEOTMS) with an atmosphere pressure chemical ionization source in positive-ion mode, while BL was characterized with an X-ray photoelectron spectrometer (XRPES). The results show that the yields of SP₂ and SP₃ are much higher than those of SP₁ and SP₄, and the total SP yield is ca. 39.0%. According to the analysis with XRPES, pyrrolic nitrogen atoms are the most abundant nitrogen existing forms in BL. Thousands of nitrogen-containing aromatics (NCAs) were resolved with QEOTMS and their molecular masses are mainly in the range of 200-450 u. The main NCAs are N₁O₁ and N₁O₂ class species with double bond equivalent values of 4-18 and carbon numbers of 7-30. The nitrogen atoms appear in pyridines, quinolines, benzoquinolines or acridine, and dibenzoquinolines or naphthoquinolines, while the oxygen atoms exist in methoxy and furan rings.

Key words: Lignite, Sequential thermal dissolution and alkanolyses, Nitrogen-containing aromatics

摘要： Soluble portions (SPs) 1-4 (SP₁-SP₄) were afforded from sequentially dissolution and alkanolyses of Baiyinhua lignite (BL) in cyclohexane, CH₃OH, CH₃CH₂OH, and (CH₃)₂CHOH at 300℃. They were analyzed with a gas chromatograph/mass spectrometer and quadrupole exactive orbitrap mass spectrometer (QEOTMS) with an atmosphere pressure chemical ionization source in positive-ion mode, while BL was characterized with an X-ray photoelectron spectrometer (XRPES). The results show that the yields of SP₂ and SP₃ are much higher than those of SP₁ and SP₄, and the total SP yield is ca. 39.0%. According to the analysis with XRPES, pyrrolic nitrogen atoms are the most abundant nitrogen existing forms in BL. Thousands of nitrogen-containing aromatics (NCAs) were resolved with QEOTMS and their molecular masses are mainly in the range of 200-450 u. The main NCAs are N₁O₁ and N₁O₂ class species with double bond equivalent values of 4-18 and carbon numbers of 7-30. The nitrogen atoms appear in pyridines, quinolines, benzoquinolines or acridine, and dibenzoquinolines or naphthoquinolines, while the oxygen atoms exist in methoxy and furan rings.

关键词: Lignite, Sequential thermal dissolution and alkanolyses, Nitrogen-containing aromatics

Yangyang Zhang, Xianyong Wei, Jinghui Lü, Hao Jiang, Fangjing Liu, Guanghui Liu, Zhimin Zong. Characterization of nitrogen-containing aromatics in Baiyinhua lignite and its soluble portions from thermal dissolution[J]. Chinese Journal of Chemical Engineering, 2019, 27(11): 2783-2787.

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Characterization of nitrogen-containing aromatics in Baiyinhua lignite and its soluble portions from thermal dissolution

Characterization of nitrogen-containing aromatics in Baiyinhua lignite and its soluble portions from thermal dissolution

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