Citation: DU Jiao-jiao, ZHAO Yun-peng, TIAN You-jia, ZHANG Di. Composition and structural characteristics of soluble organic species in Baiyinhua lignite[J]. Journal of Fuel Chemistry and Technology, ;2017, 45(1): 9-14. shu

Composition and structural characteristics of soluble organic species in Baiyinhua lignite

DU Jiao-jiao ¹ ,
ZHAO Yun-peng ^1,2,*,, ,
TIAN You-jia ¹ ,
ZHANG Di ¹

1.
Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, China University of Mining & Technology, Xuzhou 221116, China
2.
State Key Laboratory Breeding Base of Coal Science and Technology Co-founded by Shanxi Province and Ministry Education, Taiyuan University of Technology, Taiyuan 030024, China

Corresponding author: ZHAO Yun-peng, yunpengzhao2009@163.com
Received Date: 14 September 2016
Revised Date: 6 November 2016

Fund Project: Open Foundation from State Key Laboratory Breeding Base of Coal Science and Technology Co-founded by Shanxi Province and Ministry Education MKX201502Fundamental Research Funds for the Central Universities China University of Mining and Technology, 2015QNA25the National Natural Science Foundation of China 21206188

Figures(9)

Baiyinhua lignite was sequentially extracted with petroleum ether, cyclohexane, carbon disulfide, acetone, methanol and isometric acetone/carbon disulfide mixed solvent affording extracts, i.e. E₁-E₆, then extraction residue was sequentially thermal dissolved using methanol, toluene and isomeric methanol/toluene mixed solvent affording soluble portions (SPs), i.e.SP₁-SP₃. The composition and structural characteristics of extracts and SPs were characterized with Fourier transform infrared (FT-IR) spectroscopy, gas chromatography/mass spectrometer (GC/MS), direct analyze in real time mass spectrometer (DART-MS). The total extracts yield and SPs yield of BL are 9.37% and 21.84%, respectively. There exist strong adsorption peaks ascribed to hydroxyl in the FT-IR spectra of E₁ and E₆, while the intensity of adsorption peaks ascribed to aliphatic C-H in the FT-IR spectrum of E₁ is obviously higher than that of other extracts. There are similar FT-IR spectra among those 3 SPs, whereas the intensity of adsorption peak originated from hydroxyl in the FT-IR spectra of SP₁ and SP₃ is higher than those of SP₂. The compounds GC/MS detected in E₁ and E₅ are dominated with alkanes and arenes, respectively, and the content of oxygen-containing compounds (OCCs) in E₅ are more than that in E₁. The compounds in the 3 SPs are composed of alkanes and arenes, while the contents of OCCs, such as phenols, ketones and esters, in SP₃ are higher than those in SP₁ and SP₂. Many compounds with high polarity and low volatility which could not identified by GC/MS were detected using DART-MS. The carbon number and double bond equivalent (DBE) of the compounds with high content in SPs mainly distribute in 10-25 and 2-16, respectively, and the DBE increases with carbon number increasing.
- lignite,
- solvent extraction,
- thermal dissolution,
- GC/MS,
- DART-MS
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