Structural characterization of soluble products from a series of reductively butylated coals prepared in refluxing tetrahydrofuran.

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概要

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• A series of butylated Y\barubari coals were prepared by an improved reductive alkylation method, and detailed structural parameters of respective solution products in pentane (PS) and benzene (BS) were estimated; this experimental procedure is likely to offer more insight into chemical structures of products and important factors effective for solubilization than any analyses on a single product. The PS and BS have average molecular weights of 700–800 and 1500–2050 and are composed of about two and more than five structural units, respectively. These values suggest that the BS molecule is quite large compared with the corresponding products obtained by other methods such as hydrocracking. On the other hand, the ring sizes of one structural unit of the respective products are roughly the same (about three rings). The BS materials are coal macromolecules with stackings loosened by introduction of alkyl groups, while the PS materials are products through cleavage of bonds connecting the structural units and through addition of so many alkyl groups as to increase the affinity for the solvent. In addition, an absence of intermolecular hydrogen bonds mainly due to OH groups contributes to quite a high solubility of the alkylated coals. Increase in BS yield accompanies an increase in aliphatic carbon ratio and polymerization degree and a decrease in size of aromatic ring systems. These results may be ascribed to the heterogeneity of coal constituents.

• 公益社団法人 日本化学会の論文

著者

• Miyake Mikio

  Department Of Surgery Tamano Mitsui Hospital

• Nomura Masakatsu

  Department Of Applied Chemistry Faculty Of Engineering Osaka University

• Sukigara Masayuki

  Department of Applied Chemistry, Faculty of Engineering, Osaka University

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