Citation: HU Ru-nan, WANG Zhi-cai, LI Lei, WANG Xiao-ling, PAN Chun-xiu, KANG Shi-gang, REN Shi-biao, LEI Zhi-ping, SHUI Heng-fu. Effect of solvent extraction pretreatments on the variation of macromolecular structure of low rank coals[J]. Journal of Fuel Chemistry and Technology, ;2018, 46(7): 778-786. shu

Effect of solvent extraction pretreatments on the variation of macromolecular structure of low rank coals

School of Chemistry and Chemical Engineering, Anhui Key Laboratory of Clean Coal Conversion & Utilization, Anhui University of Technology, Ma'anshan 243002, China

Corresponding author: WANG Zhi-cai, zhicaiw@ahut.edu.cn
Received Date: 25 April 2018
Revised Date: 10 June 2018

Fund Project: the Natural Scientific Foundation of China 21476004the Natural Scientific Foundation of China 21476003the Natural Scientific Foundation of China 21476002Natural Science Foundation of Anhui Provincial Education Department KJ2016A808the Natural Scientific Foundation of China 51174254The project was supported by the Natural Scientific Foundation of China (21476004, 21476003, 21476002, 51174254), Natural Science Foundation of Anhui Provincial Education Department (KJ2016A808), the Provincial Innovative Group for Processing & Clean Utilization of Coal Resource and the Innovative Group of Anhui University of Technology

Figures(5)

In order to understand the effects of solvent pretreatment on the inherent macromolecular structure of low rank coal, Xilinguole lignite (XLL) and Shenfu sub-bituminous coal (SFC) were extracted by tetrahydrofuran (THF) soxhlet extraction, carbon disulfide/N-methyl-2-pyrrolidone (CS₂/NMP) mixed solvent extraction and thermal dissolution, respectively. The extracted coals were characterized by diffuse reflection FT-IR spectroscopy (DRIFT), thermogravimetric analysis (TGA), mercury intrusion method (MI) and swelling ratio determination. The results indicated that the extraction resulted in the arrangement and reassociation of coal inherent macromolecules. THF Soxhlet extraction and CS₂/NMP mixed solvent extraction can relax the macromolecular structure of coal to varying degrees by changing the non-covalent bond cross-linking, especially the distribution of hydrogen bond interactions. However, thermal dissolutions at high temperature mainly increased the covalent cross linking of coal macromolecules, especially for XLL. Swelling of all extracted coals was limited by Fickian diffusion, and the extracted coal showed lower swelling activation energy than the corresponding raw coals.
- pretreatment,
- extraction,
- macromolecular structure,
- swelling,
- diffusion
1. [1]
  XIE K C, LI F, FENG J, LIU J S. Study on the structure and reactivity of swollen coal[J]. Fuel Process Technol, 2000,64(1):241-251.
2. [2]
  MARZEC A. Macromolecular and molecular model of coal structure[J]. Fuel Process Technol, 1986,14(86):39-46.
3. [3]
  ⅡNO M. Network structure of coals and association behavior of coal-derived materials[J]. Fuel Process Technol, 2000,62(2):89-101.
4. [4]
  MARZEC A. Towards an understanding of the coal structure:A review[J]. Fuel Process Technol, 2002,77(25):25-32.
5. [5]
  KRZESIN'SKA M. Averaged structural units in bituminous coals studied by means of ultrasonic wave velocity measurements[J]. Energy Fuels, 2001,15(4):930-935. doi: 10.1021/ef0100101
6. [6]
  MONDRAGON F, QUINTERO G, JARAMILLO A, FERNANDEZA J, HALLB P J. The catalytic liquefaction of coal in the presence of ethanol[J]. Fuel Process Technol, 1998,53(3):171-181. doi: 10.1016/S0378-3820(97)00046-5
7. [7]
  STEPHENS H, KOTTENSTETTE R. Studies of coal reactivity for direct liquefaction[J]. Fuel, 1990,70(3):386-392.
8. [8]
  JOSEPH J T. Liquefaction behavior of solvent-swollen coals[J]. Fuel, 1991,70(2):139-144. doi: 10.1016/0016-2361(91)90144-Y
9. [9]
  MAE K, MAKI T, OKUTSU H, MIURA K. Examination of relationship between coal structure and pyrolysis yields using oxidized brown coals having different macromolecular networks[J]. Fuel, 2000,79(3/4):417-425.
10. [10]
  JOSEPH J T. Beneficial effects of preswelling on conversion and catalytic activity during coal liquefaction[J]. Fuel, 1991,70(3):459-464. doi: 10.1016/0016-2361(91)90139-2
11. [11]
  SHUI H F, LIU J L, WANG Z C, CAO M X, WEI X Y. Effect of pre-swelling of coal at mild temperatures on its hydro-liquefaction properties[J]. Fuel Process Technol, 2009,90(7/8):1047-1051.
12. [12]
  MATHEWS J P, BURGESS-CLIFFORD C, PAINTER P. Interactions of Illinois No. 6 bituminous coal with solvents:A review of solvent swelling and extraction literature[J]. Energy Fuels, 2015,29(3):1279-1294. doi: 10.1021/ef502548x
13. [13]
  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
14. [14]
  SHIN Y J, SHEN Y W. Preparation of coal slurry with organic solvents[J]. Chemosphere, 2007,68(2):389-393. doi: 10.1016/j.chemosphere.2006.12.049
15. [15]
  HU H Q, SHA G Y, CHEN G H. Effect of solvent swelling on liquefaction of Xinglong coal at less severe conditions[J]. Fuel Process Technol, 2000,68(1):33-34. doi: 10.1016/S0378-3820(00)00101-6
16. [16]
  SHUI H F, WANG Z C, CAO M X. Effect of pre-swelling of coal on its solvent extraction and liquefaction properties[J]. Fuel, 2008,87(13/14):2908-2913.
17. [17]
  PINTO F, GULYURTLU I, LOBO L S, CABRITA I. Effect of coal pre-treatment with swelling solvents on coal liquefaction[J]. Fuel, 1999,78(6):629-634. doi: 10.1016/S0016-2361(98)00193-8
18. [18]
  SZELIGA J, MARZEC A. Swelling of coal in relation to solvent electron-donor numbers[J]. Fuel, 1983,62(10):1229-1231. doi: 10.1016/0016-2361(83)90070-4
19. [19]
  PAINTER P C, PARK Y, SOBKOWIAK M, COLEMAN M M. Coal solubility and swelling. 2. Effect of hydrogen bonding on calculations of molecular weight from swelling measurements[J]. Energy Fuels, 1990,4(4):384-393. doi: 10.1021/ef00022a009
20. [20]
  PAINTER P C, PARK Y, GRAF J F. Coal solubility and swelling[J]. Energy Fuels, 1990,4(4):393-397. doi: 10.1021/ef00022a010
21. [21]
  LUCHT L M, PEPPAS N A. Macromolecular structure of coals:2. Molecular weight between crosslinks from pyridine swelling experiments[J]. Fuel, 1987,66(6):803-809. doi: 10.1016/0016-2361(87)90128-1
22. [22]
  NISHIOKA M. Evidence for the associated structure of bituminous coal[J]. Fuel, 1993,72(12):1719-1724. doi: 10.1016/0016-2361(93)90361-5
23. [23]
  OTAKE Y, SUUBERG E M. Temperature dependence of solvent swelling and diffusion process in coals[J]. Energy Fuels, 1997,11(6):1155-1164. doi: 10.1021/ef970020v
24. [24]
  QIN Z H, ZONG Z M, LIU J Z, MA H M, YANG M J, WEI X Y. Solubilities of lithotypes in carbon disulfide-N-methyl-2-pyrrolidinone mixed solvent[J]. J Fuel Chem Technol, 1997,25(6):549-553.
25. [25]
  YOSHIDA T, TAKANOHASHI T, SAKANISHI K, SAITO I, FUJITA M, MASHIMO K. The effect of extraction condition on 'HyperCoal' production (1) under room-temperature filtration[J]. Fuel, 2002,81(11/12):1463-1469.
26. [26]
  MIURA K, NAKAGAWA H, ASHIDA R, IHARA T. Production of clean fuels by solvent skimming of coal at around 350℃[J]. Fuel, 2004,83(6):733-738. doi: 10.1016/j.fuel.2003.09.019
27. [27]
  YOSHIDA T, LI C, TAKANOHASHI T, MATSUMURA A, SATO S, SAITO I. Effect of extraction condition on "HyperCoal" production (2) effect of polar solvents under hot filtration[J]. Fuel Process Technol, 2004,86(1):61-72. doi: 10.1016/j.fuproc.2003.12.003
28. [28]
  WANG Z C, SHUI H F, PAN C X, LI L, REN S B, LEI Z P, KANG S G, WEI C, HU J C. Structural characterization of the thermal extracts of lignite[J]. Fuel Process Technol, 2014,120(120):8-15.
29. [29]
  WANG Z C, LI L, SHUI H F, LEI Z P, REN S B, KANG S G. High temperature thermal extraction of Xianfeng lignite and FT-IR characterization of its extracts and residues[J]. J Fuel Chem Technol, 2011,39(6):401-406. doi: 10.1016/S1872-5813(11)60027-3
30. [30]
  WANG Z C, SHUI H F, PEI Z N, GAO J S. Study on the hydrothermal treatment of Shenhua coal[J]. Fuel, 2008,87(4):527-533.
31. [31]
  OKOLO G N, EVERSON R C, NEOMAGUS H W J P, ROBERTS M J, SAKUROVS R. Comparing the porosity and surface areas of coal as measured by gas adsorption, mercury intrusion and SAXS techniques[J]. Fuel, 2015,141(141):293-304.
32. [32]
  ⅡNO M, TAKANOHASHI T, OBARA S, TSUETA H, SANKAWA Y. Characterization of the extracts and residues from CS₂-N-methyl-2-pyrrolidinone mixed solvent extraction[J]. Fuel, 1989,68(12):1588-1593. doi: 10.1016/0016-2361(89)90299-8
33. [33]
  OTAKE Y, SUUBERG E M. Solvent swelling rates of low rank coals and implications regarding their structure[J]. Fuel, 1998,77(8):901-904. doi: 10.1016/S0016-2361(97)00256-1
34. [34]
  PANDE S, SHARMA D K. Studies of kinetics of diffusion of N-methyl-2-pyrrlidone (NMP), ethylenediamine (EDA) and NMP+EDA (1:1, vol/vol) mixed solvent system in Chinakuri coal by solvent swelling techniques[J]. Energy Fuels, 2001,15(5):1063-1068. doi: 10.1021/ef9902395
35. [35]
  ESTAPE D, GODIA F, SOLA C. Determination of glucose and ethanol effective diffusion coefficients in Ca-alginate gel[J]. Enzyme Microb Technol, 1992,14(5):396-401. doi: 10.1016/0141-0229(92)90009-D
36. [36]
  RITGER P L, PEPPAS N A. Transport of penetrants in the macromolecular structure of coals, 7. Transport in thin coal sections[J]. Fuel, 1987,66(10):1379-1388. doi: 10.1016/0016-2361(87)90185-2
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