Composition and structure characteristics of soluble organic matter from Naomaohu lignite by sequential extraction and thermal conversion performance of the corresponding residue

MAO Kai-min; MO Wen-long; MA Feng-yun; MA Ya-ya; WANG Yue; WEI Xian-yong; FAN Xing

doi:10.1016/S1872-5813(21)60117-2

Volume 49 Issue 10

Oct. 2021

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Article Navigation > Journal of Fuel Chemistry and Technology > 2021 > 49(10): 1389-1401

MAO Kai-min, MO Wen-long, MA Feng-yun, MA Ya-ya, WANG Yue, WEI Xian-yong, FAN Xing. Composition and structure characteristics of soluble organic matter from Naomaohu lignite by sequential extraction and thermal conversion performance of the corresponding residue[J]. Journal of Fuel Chemistry and Technology, 2021, 49(10): 1389-1401. doi: 10.1016/S1872-5813(21)60117-2

Citation:

MAO Kai-min, MO Wen-long, MA Feng-yun, MA Ya-ya, WANG Yue, WEI Xian-yong, FAN Xing. Composition and structure characteristics of soluble organic matter from Naomaohu lignite by sequential extraction and thermal conversion performance of the corresponding residue[J]. Journal of Fuel Chemistry and Technology, 2021, 49(10): 1389-1401. doi: 10.1016/S1872-5813(21)60117-2

Citation:

MAO Kai-min, MO Wen-long, MA Feng-yun, MA Ya-ya, WANG Yue, WEI Xian-yong, FAN Xing. Composition and structure characteristics of soluble organic matter from Naomaohu lignite by sequential extraction and thermal conversion performance of the corresponding residue[J]. Journal of Fuel Chemistry and Technology, 2021, 49(10): 1389-1401. doi: 10.1016/S1872-5813(21)60117-2

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Composition and structure characteristics of soluble organic matter from Naomaohu lignite by sequential extraction and thermal conversion performance of the corresponding residue

doi: 10.1016/S1872-5813(21)60117-2

MAO Kai-min^1
,,
MO Wen-long^{1
,
,},
MA Feng-yun^{1
,
,},
MA Ya-ya¹,
WANG Yue^{1, 2},
WEI Xian-yong^{1, 3},
FAN Xing^{1, 3}

1.
State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources and Key Laboratory of Coal Clean Conversion & Chemical Engineering Process (Xinjiang Uyghur Autonomous Region), College of Chemical Engineering, Xinjiang University, Urumqi 830046, China
2.
Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, Xuzhou 221116, China
3.
College of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao 266590, China

Funds: The project was supported by Tianchi Project for Introducing High-Level Talents to Xinjiang Uyghur Autonomous Region (China), Key Laboratory of Coal Processing and Efficient Utilization from Ministry of Education and Open Project of Key Laboratory of Xinjiang Uygur Autonomous Region (2018D04008)

Received Date: 2021-03-11
Rev Recd Date: 2021-04-25

Available Online: 2021-06-17

Publish Date: 2021-10-30

Abstract

Abstract

Carbon disulfide (CDS), methanol, acetone and isometric carbon disulfide/acetone mixture (IMCDSAM) were used as solvents to sequentially extract Naomaohu lignite (NL) via ultrasonic-assisted extraction to obtain extracts (E1−E4) and final extraction residue (ER). Composition and structure of E1−E4 were analyzed by GC-MS. It is found that the main compounds in E1 are alkanes, aromatics, alcohols and esters. Alkanes, alcohols and esters are the main compounds in E2. Alcohols, phenolics and esters are the main components in E3, and esters are mainly phthalic diester compounds. Affected by synergistic effect of the two solvents CDS and acetone, the relative content of alkenes in E4 is relatively high. FT-IR was used to characterize functional groups in NL, E1−E4 and ER. The results show that the ultrasonic extraction process only extracts free small compounds from macromolecular skeleton of the NL and some other molecules, which connect the macromolecular skeleton by weak covalent bonds, and the process does not destroy the macromolecular skeleton structure. In addition, peak fitting results from FT-IR show that types of infrared absorption peaks in ER do not change after ultrasonic extraction, while intensity of the peaks varies. TG-DTG profiles of NL and ER indicate that after ultrasonic extraction weight loss of NL increases from 47.09% to 51.04%, and peak of the maximum weight loss rate is advanced from 450 to 430 ℃. Pyrolysis kinetic analyses of NL and ER based on Coats-Redfern model show that after ultrasonic extraction activation energy of ER in rapid pyrolysis stage is lower than that of NL, and the pyrolysis process is easier to proceed.
- lignite,
- sequential extraction,
- thermochemical conversion,
- GC/MS

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References(31)

References

[1]	HE W J, LIU Z Y, LIU Q Y, SHI L, SHI X, WU J F, GUO X J. Behavior of radicals during solvent extraction of three low rank bituminous coals[J]. Fuel Process Technol,2017,156:221−227. doi: 10.1016/j.fuproc.2016.10.029
[2]	KONG J, WEI X Y, ZHAO M X, LI Z K, YAN H L, ZHENG Q X, ZONG Z M. Effect of sequential extraction and thermal dissolution on the structure and composition of Buliangou subbituminous coal[J]. Fuel Process Technol,2016,148:324−331. doi: 10.1016/j.fuproc.2016.03.014
[3]	殷甲楠, 张凤桐, 樊丽华, 梁英华, 王蕾. 低阶煤有机溶剂萃取的研究进展[J]. 洁净煤技术,2014,20(6):100−103+51. YIN Jia-nan, ZHANG Feng-tong, FAN Li-hua, LIANG Ying-hua, WANG Lei. Research progress of organic solvent extraction of low rank coal[J]. Clean Coal Technol,2014,20(6):100−103+51.
[4]	MA Y Y, MA F Y, MO W L. Five-stage sequential extraction of Hefeng coal and direct liquefaction performance of the extraction residue[J]. Fuel,2019,266:117039.
[5]	王晓华, 魏贤勇, 宗志敏. 溶剂分级萃取法研究平朔煤的化学组成特征[J]. 煤炭转化,2006,29(2):4−7. doi: 10.3969/j.issn.1004-4248.2006.02.002 WANG Xiao-hua, WEI Xian-yong, ZONG Zhi-min. Study on chemical constituent characteristic of fractionated extraction from Pingshuo coal[J]. Coal Convers,2006,29(2):4−7. doi: 10.3969/j.issn.1004-4248.2006.02.002
[6]	戈军, 郭龙德, 郭智慧, 石斌, 张建芳. 溶剂与溶胀促进剂对神华煤溶胀行为的影响[J]. 化工进展,2010,29(10):1885−1889. GE Jun, GUO Long-de, GUO Zhi-hui, SHI Bing, ZHANG Jian-fang. Shenhua coal swelling with solvents and swelling promoters[J]. Chem Ind Eng Prog,2010,29(10):1885−1889.
[7]	IINO M, TAKANOHASHI T, OHSUGA H, TODA K. Extraction of coals with CS₂-N-methyl-2-pyrrolidinone mixed solvent at room temperature: Effect of coal rank and synergism of the mixed solvent[J]. Fuel,1988,67(12):1639−1647. doi: 10.1016/0016-2361(88)90208-6
[8]	吴法鹏, 鲁浩, 闫洁, 王瑞玉, 赵云鹏, 魏贤勇. 两种不同还原性次烟煤可溶有机质分子组成差异[J]. 燃料化学学报,2018,46(7):769−777. doi: 10.3969/j.issn.0253-2409.2018.07.001 WU Fa-peng, LU Hao, YAN Jie, WANG Rui-yu, ZHAO Yun-peng, WEI Xian-yong. Differences in molecular composition of soluble organic species in two Chinese subbituminous coals with different reducibility[J]. J Fuel Chem Technol,2018,46(7):769−777. doi: 10.3969/j.issn.0253-2409.2018.07.001
[9]	LIU F J, WEI X Y, GUI J, WANG Y G, LI P. Characterization of biomarkers and structural features of condensed aromatics in Xianfeng lignite[J]. Energy Fuels,2013,27(12):7369−7378. doi: 10.1021/ef402027g
[10]	LIU F J, WEI X Y, GUI J, LI P, WANG Y G, LI W T, ZONG Z M, FAN X, ZHAO Y P. Characterization of organonitrogen species in Xianfeng lignite by sequential extraction and ruthenium ion-catalyzed oxidation[J]. Fuel Process Technol,2014,126:199−206. doi: 10.1016/j.fuproc.2014.05.004
[11]	HAS B, GI A, JW A. Pyrolysis characteristics and kinetics of low rank coals by distributed activation energy model[J]. Energy Convers Manage,2016,126:1037−1046.
[12]	LIU J X, MA J F, LEI L, ZHANG H, JIANG X M. Pyrolysis of superfine pulverized coal. Part 5. Thermogravimetric analysis[J]. Energy Conver Manage,2017,154:491−502. doi: 10.1016/j.enconman.2017.11.041
[13]	LIU F J, WEI X Y, FAN M H, ZONG Z M. Separation and structural characterization of the value-added chemicals from mild degradation of lignites: A review[J]. Appl Energy,2016,170:415−436. doi: 10.1016/j.apenergy.2016.02.131
[14]	HU R N, WANG Z C, LI L, WANG X L, PAN C X, KANG S G. Effect of solvent extraction pretreatments on the variation of macromolecular structure of low rank coals[J]. J Fuel Chem Technol,2018,46(7):778−786. doi: 10.1016/S1872-5813(18)30034-3
[15]	LV J H, WEI X Y, WANG Y H, WANG T M, LIU J, ZHANG D D. Mass spectrometric analyses of biomarkers and oxygen-containing species in petroleum ether-extractable portions from two Chinese coals[J]. Fuel,2016,173:260−267. doi: 10.1016/j.fuel.2016.01.067
[16]	SHI D L, WEI X Y, FAN X, ZONG Z M, CHEN B, ZHAO Y P, WANG Y G, CAO J P. Characterizations of the extracts from geting bituminous coal by spectrometries[J]. Energy Fuels,2013,27:3709−3717. doi: 10.1021/ef4004686
[17]	LI Z K, WEI X Y, YAN H L. Advances in lignite extraction and conversion under mild conditions[J]. Energy Fuels,2015,29:6869−6886.
[18]	LI F, ZHAO G Y, ZHAO Y G, ZHAO M S, TANG J W. Construction of the molecular structure model of the Shengli lignite using TG-GC/MS and FTIR spectrometry data[J]. Fuel,2017,203:924−931. doi: 10.1016/j.fuel.2017.04.112
[19]	LIAO J J, FEI Y, MARSHALL M, L. CHAFFEE A, CHANG L P. Hydrothermal dewatering of a Chinese lignite and properties of the solid products[J]. Fuel,2016,180:473−480. doi: 10.1016/j.fuel.2016.04.027
[20]	TIAN B, QIAO Y Y, TIAN Y Y, XIE K C, LIU Q, ZHOU H F. FTIR study on structural changes of different-rank coals caused by single/multiple extraction with cyclohexanone and NMP/CS₂ mixed solvent[J]. Fuel Process Technol,2016,154:210−218. doi: 10.1016/j.fuproc.2016.08.035
[21]	WANG S, TANG Y, SCHOBERT H H, GUO Y, SU Y. FTIR and ¹³C NMR investigation of coal component of late permian coals from southern China[J]. Energy Fuels,2011,25(12):5672−5677. doi: 10.1021/ef201196v
[22]	ZHANG W Q, JIANG S G, WANG K, WU Z Y, SHAO H. An experimental study of the effect of ionic liquids on the low temperature oxidation of coal[J]. Int J Min Sci Technol,2012,22(5):687−691. doi: 10.1016/j.ijmst.2012.08.016
[23]	SONG H J, LIU G R, ZHANG J Z, WU J H. Pyrolysis characteristics and kinetics of low rank coals by TG-FTIR method[J]. Fuel Process Technol,2017,156:454−460. doi: 10.1016/j.fuproc.2016.10.008
[24]	WU D, LIU G J, SUN R Y. Investigation on structural and thermodynamic characteristics of perhydrous bituminous coal by fourier transform infrared spectroscopy and thermogravimetry/Mass spectrometry[J]. Energy Fuels,2014,28:3024−3035. doi: 10.1021/ef5003183
[25]	LIN X C, WANG C H, IDETA K, MIYAWAKI J, NISHIYAMA Y, WANG Y G, YOON S, MOCHIDA I. Insights into the functional group transformation of a Chinese brown coal during slow pyrolysis by combining various experiments[J]. Fuel,2014,118:257−264. doi: 10.1016/j.fuel.2013.10.081
[26]	KOTYCZKA-MORAŃSKA M, TOMASZEWICZ M. Comparison of the first stage of the thermal decomposition of polish coals by diffuse reflectance infrared spectroscopy[J]. J Energy Inst,2018,91(2):240−250. doi: 10.1016/j.joei.2016.11.011
[27]	HE X Q, LIU X F, NIE B S, SONG D Z. FTIR and Raman spectroscopy characterization of functional groups in various rank coals[J]. Fuel,2017,206:555−563. doi: 10.1016/j.fuel.2017.05.101
[28]	ARENILLAS A, RUBIERA F, PEVIDA C, PIS J J. A comparison of different methods for predicting coal devolatilisation kinetics[J]. J Anal Appl Pyrolysis,2001,58:685−701.
[29]	SAIKIA B K, BORUAH R K, GOGOI P K. FT-IR and XRD analysis of coal from makum coalfield of assam[J]. J Earth Syst Sci,2007,116(6):575−579. doi: 10.1007/s12040-007-0052-0
[30]	于文浩, 雷智平, 潘春秀, 任世彪. 预处理对褐煤热解行为的影响研究进展[J]. 燃料与化工,2018,49(2):1−3+11. YU Wen-hao, LEI Zhi-ping, PAN Chun-xiu, REN Shi-biao. Study on the influence of pre-treatment to lignite pyrolysis[J]. Fuel Chem Process,2018,49(2):1−3+11.
[31]	刘耀鑫, 伯灵, 冯兆兴, 李晓鹤. 溶胀预处理煤热解特性研究[J]. 煤炭技术,2018,37(4):304−306. LIU Yao-xin, BO Ling, FENG Zhao-xing, LI Xiao-he. Study on behavior of solvent swelling coal pyrolysis[J]. Coal Technol,2018,37(4):304−306.