Effect of Solvent Pretreatment on the Flash Pyrolysis Performance of Yinggema Lignite

Wen-Long Mo, Hui Kan, Ting Wu, Xiao-Bo Hu, Ya-Ya Ma (), Jia Guo, Wen-Cang Guo, Xian-Yong Wei and Naeem Akram
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Wen-Long Mo: Xinjiang Energy Co., Ltd., Urumqi 830018, China
Hui Kan: State Key Laboratory of Chemistry and Utilization of Carbon-Based Energy Resources, Key Laboratory of Coal Clean Conversion & Chemical Engineering Process, College of Chemical Engineering, Xinjiang University, Urumqi 830046, China
Ting Wu: State Key Laboratory of Chemistry and Utilization of Carbon-Based Energy Resources, Key Laboratory of Coal Clean Conversion & Chemical Engineering Process, College of Chemical Engineering, Xinjiang University, Urumqi 830046, China
Xiao-Bo Hu: State Key Laboratory of Chemistry and Utilization of Carbon-Based Energy Resources, Key Laboratory of Coal Clean Conversion & Chemical Engineering Process, College of Chemical Engineering, Xinjiang University, Urumqi 830046, China
Ya-Ya Ma: State Key Laboratory of Chemistry and Utilization of Carbon-Based Energy Resources, Key Laboratory of Coal Clean Conversion & Chemical Engineering Process, College of Chemical Engineering, Xinjiang University, Urumqi 830046, China
Jia Guo: Xinjiang Energy Co., Ltd., Urumqi 830018, China
Wen-Cang Guo: Xinjiang Energy Co., Ltd., Urumqi 830018, China
Xian-Yong Wei: State Key Laboratory of Chemistry and Utilization of Carbon-Based Energy Resources, Key Laboratory of Coal Clean Conversion & Chemical Engineering Process, College of Chemical Engineering, Xinjiang University, Urumqi 830046, China
Naeem Akram: School of Chemical Engineering, Minhaj University Lahore, Lahore 54000, Punjab, Pakistan

Sustainability, 2023, vol. 15, issue 15, 1-14

Abstract: Yinggema lignite (YL) was pretreated with isometric acetone/carbon disulfide mixed solvent to obtain the residue (R YL ) and, then, R YL was separated by density difference with carbon tetrachloride to obtain the light residue (LR YL ). The flash pyrolysis performances of YL and LR YL were analyzed by thermogravimetry–Fourier transform infrared spectrometer–Gas chromatography/mass spectrometer (TG-FTIR-GC/MS). The results showed that solvent pretreatment could remove some small molecules in the coal and swell the used coal, leading to the increase in pyrolysis reactivity. The intensity and absorption peak area of C=O from LR YL were significantly reduced compared to YL, resulting from the high hydrogen-donating ability of acetone. The main gaseous products of both samples are H 2 O, CH 4 , CO 2 , and CO; the hydrocarbons detected by GC/MS in the pyrolysis products of YL and LR YL at 450 °C were mainly alkanes, alkenes, and arenes, with the higher relative contents of alkanes of 31.1% and 36.2%, followed by arenes of 27.1% and 22.6%, respectively. The oxygen-containing compounds were mainly alcohols and phenols. It is speculated that the pretreated coal could expose more oxygen-containing functional groups, facilitating their conversion to phenolic hydroxyl groups during the pyrolysis process, resulting in more phenolic compounds.

Keywords: lignite; flash pyrolysis; solvent treatment; TG-FTIR-GC/MS (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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