Pb-253 リグニンの選択的変換による芳香族二量体の定量的取得(ポスターセッション2:2.技術,研究発表,(ポスター発表))

概要

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Lignophenol synthesized from lignin is designed so that the β-O-4 linkages can be selectively cleaved under alkaline conditions around 140-170℃, resulting in significant depolymerization. Phenylcoumaran type aromatic dimers are obtained after acidification both in the acid-insoluble fraction and in the acidified solution. Hinoki and Eucalyptus lignocresol synthesized through the phase separation system were treated in 0.5 M NaOH at 170℃ for 30 min, and acidified with HCl. Then, the resulting acid-insoluble fraction was repeatedly dissolved in NaOH and acidified with HCl. According to GPC and GC-MS analyses, all phenylcoumaran type dimers were successfully isolated in the acidified solution. The isolated dimers were treated in 1 and 4 M NaOH at 170℃ for 60 min. Only a part of the dimers were converted to lower molecular weight compounds in 1 M NaOH, in contrast, was polymerized in 4 M NaOH. The acid-insoluble derivatives from Eucalyptus lignocresol functioned as a plasticizer of Hinoki lignocresol.
2012-01-18