Abstract
Shengli lignite (SL) was thermally treated at 150 °C–650 °C. SL and each residue (RTT) from the thermal treatment (TT) were oxidized using aqueous hydrogen peroxide (AHPO)/acetic acid (AA) to afford a soluble portion (SP). SL and each RTT were characterized with a X-ray diffractometer and Fourier transform infrared spectrometer, and 11 typical benzenepolycarboxylic acids (BPCAsI) in the SPs were analyzed with a high-performance liquid chromatograph. The results show that the condensation degree (CDARs) of aromatic rings (ARs) in each RTT is higher than that of SL and increases with raising the TT temperature, while the oxidation of a RTT resulting from lower-temperature TT produces BPCAsI, especially mellitic acid, in higher yields. HOO· produced in AHPO/AA could play an crucial role in oxidizing AR-containing macromolecular species in SL and each RTT to BPCAsI.
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