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- W2063419548 abstract "Extraction and de-ashing of coals with N-methyl pyrrolidone (NMP) under mild conditions has been reported recently. In this work, we have studied about a dozen American coals, along with some of their residues and extracts after treatment with NMP using in situ ESR (Electron Spin Resonance) spectroscopy of free radicals. At room temperature, N-8 (number of free radials/g) decreases whereas the percentage extraction increases with atomic H/C of coals. Also N8 for extract (residue) is lower (higher) than that for coals, ESR spectra of the extract exhibits only the single broad component and the weighted average of N8 for the extract and the residue nearly equals that of the parent coal. These results have led to the hypothesis that the treatment with NMP is an extraction process in which exinites and to a lesser degree vitrinites are favored, whereas the inertinites are nearly rejected by NMP." @default.
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- W2063419548 date "1988-05-01" @default.
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- W2063419548 title "Relationship of coal extraction with free radicals and coal macerals" @default.
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- W2063419548 doi "https://doi.org/10.1016/0378-3820(88)90052-5" @default.
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