Abstract
Three Chinese bituminous coals collected from Shenfu, Heidaigou and Feicheng coal fields were respectively extracted with carbon-disulfide/N-methyl-2-pyrrolidinone (CS2/NMP) mixed solvent (volume ratio 1:1) at room temperature followed by distillation of CS2 under ambient pressure and subsequent removal of most of NMP by distillation at 110°C under reduced pressure to afford mixed solvent-extractable fractions (MSEFs) with small amount of NMP. Acetone-extractable fraction 1 (AEF1) was obtained by extracting each MSEF under ultrasonic irradiation at room temperature and subsequently using a Soxhlet extractor. Direct extraction of each bituminous coal affords acetone-soluble fraction 2 (AEF2). GC/MS analysis shows that m/z of base or secondary peak in mass spectra of a series of components from each AEF1 is 98, whereas such components were not detected in AEF2. Since m/z of base peak in mass spectrum of NMP itself is 99, the base or secondary peak at m/z 98 should result from loss of α-H from NMP, i.e., NMP is strongly associated with some organic species (OSs) and thereby the components detected with base or secondary peak at m/z 98 in their mass spectra should be associated NMP-OS.
Similar content being viewed by others
References
Iino M, Kumagai J, Ito O. Coal extraction with carbon-disulfide mixed solvent at room temperature. J Fuel Soc Jpn, 1985, 64(3): 210–212
Iino M, Takanohashi T, Ohsuga H, et al. Extraction of coals with CS2-N-methyl-2-pyrrolidinone mixed solvent at room temperature: Effect of coal bank and synergism of the mixed solvent. Fuel, 1988, 67(12): 1639–1647
Cai M F, Smart R B. Quantitative analysis of N-methyl-2-pyrrodinone in coal extracts by TGA-FTIR. Energy Fuels, 1993, 7(1): 52–56
Mochida I, Kinya S. Advances in Catalysis. New York: Academic Press, 1994
Chervenick S W, Smart R B. Quantitative analysis of N-methyl-2-pyrrolidinone retained in coal extracts by thermal extraction G.C.-M.S. Fuel, 1995, 74(2): 241–245
Gao H, Nomura M, Murata S, et al. Statistical distribution characteristics of pyridine transport in coal particles and a series of new phenomenological models for overshoot and nonovershoot solvent swelling of coal particles. Energy Fuels, 1999, 13(2): 518–528
Zong Z M, Peng Y L, Qin Z H, et al. Reaction of N-methyl-2-pyrrodinone with carbon disulfide. Energy Fuels, 2000, 14(3): 734–735
Zong Z M, Peng Y L, Liu Z G, et al. Convenient synthesis of N-methylpyrrolidine-2-thione and some thioamides. Korean J Chem Eng, 2003, 20(2): 235–238
Wang B, Wei X, Xie K. Study on reaction of N-methylpyrrolidine-2-thione with carbon disulfide using density functional theory. J Chem Ind Eng, 2004, 55(4): 569–574
Fu X B, Zhang C, Zhang D J, et al. Theoretical evidence for the reaction of N-methyl-2-pyrrolidinone with carbon disulfide. Chem Phys Lett, 2006, 420(1): 162–165
Author information
Authors and Affiliations
Corresponding author
Additional information
Supported by the National Natural Science Foundation of China (Grant Nos. 90410018, 90510008 and 10432060), the Key Project of Chinese Ministry of Education (Grant No. 104031) and the Program of the Universities in Jiangsu Province for Development of High-Tech Industries (Grant No. JHB05-33)
About this article
Cite this article
Liu, C., Zong, Z., Jia, J. et al. An evidence for the strong association of N-methyl-2-pyrrolidinone with some organic species in three Chinese bituminous coals. Chin. Sci. Bull. 53, 1157–1164 (2008). https://doi.org/10.1007/s11434-007-0509-1
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11434-007-0509-1