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Extraction residue (ER) from Xianfeng lignite via ultrasonic extraction was subjected to methanolysis in the presence of NaOH at 300°C for 2h, and extracts 1–4 (E’1-E’4) from ER methanolysis were acquired by subsequent separation of the resulting soluble portion (SP). NaOH could promote ER methanolysis and hence increased the SP yield. Detailed molecular compositions (MCs) of E’1-E’4 were characterized...
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