Serious Changing the PAHs Contents in Suncun Coal through Subcritical Isopropyl Ether_Benzene Pretreatment

Volume 4, Issue 5, October 2019     |     PP. 137-145      |     PDF (189 K)    |     Pub. Date: September 25, 2019
DOI:    249 Downloads     7003 Views  

Author(s)

Zhen-Xue Liu, College of Chemical and Environment Engineering, Shandong University of Science and Technology, Qingdao 266590, China.
Xiao-Wen Zhang, College of Chemical and Environment Engineering, Shandong University of Science and Technology, Qingdao 266590, China.
Xiao-Xuan Wei, College of Chemical and Environment Engineering, Shandong University of Science and Technology, Qingdao 266590, China.
Shi-Xue Zhou, College of Chemical and Environment Engineering, Shandong University of Science and Technology, Qingdao 266590, China.

Abstract
Suncun coal was pretreated with subcritical isopropyl ether/benzene for observing the changes of the polycyclic aromatic hydrocarbons (PAHs) contents. The raw and pretreated coal samples were extracted by using cyclohexane as the first step then extracted by using benzene as the second step respectively. The extracts were analyzed by gas chromatograph-mass spectrometer (GC/MS), and twelve PAHs in extracts were analyzed quantitatively. The results indicated that all the extracts yields and the contents of these PAHs in extracts were different according to the pretreatments and the extracting solvents; and the PAHs contents in all the extracts from pretreated coals were much higher than them from raw coal. Both isopropyl ether and benzene are common solvents we used in laboratory and in industrial; these results show that we need new ideas to study the compositions, the structure and the applications of coal, as well to understand the environmental impact from coal using. And if we want to know what the genuine coal is, more researching work should be done.

Keywords
coal; subcritical; isopropyl ether; benzene; extract; PAHs; GC/MS

Cite this paper
Zhen-Xue Liu, Xiao-Wen Zhang, Xiao-Xuan Wei, Shi-Xue Zhou, Serious Changing the PAHs Contents in Suncun Coal through Subcritical Isopropyl Ether_Benzene Pretreatment , SCIREA Journal of Chemistry. Volume 4, Issue 5, October 2019 | PP. 137-145.

References

[ 1 ] Y. Zong, Z. Zong, M. Ding, L. Zhou, Y. Huang, Y. Zheng, X. Jin, Y. Ma and X. Wei. Separation and analysis of organic compounds in an Erdos coal. Fuel. 88 (2009): 469-74
[ 2 ] R. Wang and G. Liu. Variations of concentration and composition of polycyclic aromatic hydrocarbons in coals in response to dike intrusion in the Huainan coalfield in eastern China. Organic Geochemistry. 83–84 (2015): 202–14
[ 3 ] Z. Zhao, K. Liu, W. Xie, W. Pan and J. T. Riley. Soluble polycyclic aromatic hydrocarbons in raw coals. Journal of Hazardous Materials. B73 (2000): 77-85
[ 4 ] H. Zhang, G. Liu, J. Xue. The impact on the species, concentration and distribution of PAHs extracted by different solvents from raw coal. Environmental Chemistry. 24 (2005): 613-616
[ 5 ] J. Xue, G. Liu, Z. Niu, C. Chou, C. Qi, L. Zheng and H. Zhang. Factors that influence the extraction of polycyclic aromatic hydrocarbons from coal. Energy & Fuels. 21 (2007): 881-890
[ 6 ] L. M. Assis, J. S. S. Pinto and F. M. Lancas. Comparison among different extraction methods (PFE, SFE, Sonication, Soxhlet) for the isolation of organic compounds from coal. Journal of Microcolumn Separation. 12(2000): 292-301
[ 7 ] H. Shui, Z. Wang and M. Cao. Effect of pre-swelling of coal on its solvent extraction and liquefaction properties, Fuel. 87 (2008): 2908-2913
[ 8 ] Z. Liu, Z. Liu, Z. Zong, X. Wei, J. Wang and C. W. Lee. GC/MS Analysis of water-soluble products from the mild oxidation of Longkou brown coal with H2O2. Energy & Fuels. 17 (2003): 424-426
[ 9 ] Z. Liu, X. Wei and Z. Zong. Effect of Pretreatment on PAH Contents in Extracts from Xinwen Coal. Energy Sources, Part A. 36 (2014): 2645-2649
[ 10 ] S. A. Stout and S. D. Emsbo-Mattingly. Concentration and character of PAHs and other hydrocarbons in coals of varying rank – Implications for environmental studies of soils and sediments containing particulate coal. Organic Geochemistry. 39 (2008): 801-819
[ 11 ] R. Wang, G. Liu, J. Zhang, C. Chou, and J. Liu. Abundances of Polycyclic Aromatic Hydrocarbons (PAHs) in 14 Chinese and American Coals and Their Relation to Coal Rank and Weathering. Energy & Fuels. 24 (2010): 6061-6066
[ 12 ] V. Zubkova and M. Czaplicka. Changes in the structure of plasticized coals caused by extraction with dichloromethane. Fuel. 96 (2012): 298-305
[ 13 ] C. Liu, Z. Zong, J. Jia, G.. Liu, X. Wei, An evidence for the strong association of N-methyl-2-pyrrolidinone with some organic species in three Chinese bituminous coals. Chin. Sci. Bull. 53 (2008): 1157–1164
[ 14 ] T. Wang. Z. Zong, F. Liu, C. Liu, J. Lv, J. Liu, D. Zhang, M. Qu, J. Gui, X. Liu, X. Wei, Z. Wei, Y. Li. Investigation on compositional and structural features of Xianfeng lignite through sequential thermal dissolution. Fuel Processing Technology, 138 (2015): 125–132