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Extracting polycyclic aromatic structures (PASs)-enriched portion from direct coal liquefaction residue (DCLR) with an energy-efficient way is significantly important for the effective utilization of DCLR. In the investigation, dipropylamine (DPA) with weak polarity was used to extract DCLR as a CO2-triggered switchable solvent. When the extract solution was triggered by CO2, the extract automatically...
Although considerable progress has been made in revealing the coal macromolecular structure via solvent extraction, there remains a challenge in elucidating the coal structure due to low extraction yields of coal, poor selectivity of extraction solvents, and complexity of extracts. In this work, a high-volatile bituminous coal was successfully separated into seven groups (G1–G7) with less diversity...
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