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Solvent extraction (SE) of Hanglaiwan subbituminous coal (HSBC) was conducted with isometric carbon disulfide/acetone mixed solvent to obtain an extract, i.e., soluble portion 1 (SP1) and extraction residue (ER). Thermal dissolution (TD) and alkanolyses of the ER were carried out at 300 °C in cyclohexane (CH), ethyl acetate (EA), methanol (M), and ethanol (E), respectively, to obtain soluble portions (SPs) 2–5 (SP2-SP5), which were analyzed with a gas chromatograph/mass spectrometer (GC/MS), Fourier transform infrared spectrometer (FTIRS), and quadrupole exactive orbitrap mass spectrometer (QPEOTMS). According to the analysis with GC/MS, the yields of SP4 (25.2%) and SP5 (38.6%) are much higher than those of SP2 (2.6%) and SP3 (7.1%), and SP1-SP5 are rich in alkylbenzenes (ABs), while the semiquantitative analysis with FTIRS suggests that the cleavage of weak and medium-strength covalent bonds, especially oxygen-containing bridged bonds, should be the main reaction during the TD and alkanolyses. For O1-O6 class species detected with QPEOTMS, O1-O2 class species dominated in SP1, SP2, SP4, and SP5, while O2 class species are predominant in SP3. The main O1 class species are alkyl-substituted arenols (ASAs) and acetophenones (APsII), while the O2 class species mainly consist of fatty acids (FAs), alkyl-substituted hydroquinones (ASHQs), methyl alkyl-substituted benzoates (MASBs), and arenediols. This investigation provides an effective approach for understanding the composition of the macromolecular networks (MMNWs) in HSBC. |
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