Characterization of the extracts and residues from CS2-N-methyl-2-pyrrolidinone mixed solvent extraction |
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Authors: | Masashi Iino Toshimasa Takanohashi Satoshi Obara Hisanobu Tsueta Yutaka Sanokawa |
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Affiliation: | Chemical Research Institute of Non-Aqueous Solutions, Tohoku University, Aoba-ku, Katahira 2-1-1, Sendai 980, Japan |
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Abstract: | The extracts and residues obtained by extraction of five bituminous coals with CS2-N-methyl-2-pyrrolidinone mixed solvent (1:1 by volume) were characterized at room temperature. The extraction yields were 31.1–63.0% (daf) and the extracts were fractionated into acetone soluble (AS), acetone insoluble-pyridine soluble (PS) and pyridine insoluble-mixed solvent soluble (MS) fractions. The MS fraction, which was the heaviest fraction examined, had higher values of % oxygen, fa, molecular weight and spin concentration than the corresponding AS and PS fractions, but a similar degree of aromatic condensation. The quantities of volatile matter (daf) in the residues were similar or slightly less than those in the extracts. |
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Keywords: | solvent extraction bituminous coal size exclusion chromatography |
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