Conversion of lignin with supercritical water-phenol mixtures

Motofumi Saisu, Takafumi Sato, Masaru Watanabe, Tadafumi Adschiri, Kunio Arai

Research output: Contribution to journalArticlepeer-review

259 Citations (Scopus)

Abstract

The decomposition of lignin was examined in supercritical water with and without phenol at 673 K. In the absence of phenol, the yield of tetrahydrofuran (THF)-insoluble (TIS) products decreased and the molecular weight distribution of THF-soluble (TS) products shifted toward lower molecular weights as the water density increased. The increase in water density enhanced the lignin conversion. In the presence of phenol, the yield of TIS products was lower and the molecular weight distribution of TS products shifted toward lower molecular weights than those in the absence of phenol. Some alkylphenols were obtained only in the presence of phenols, because of the reaction of phenol with the decomposition products. These results show that the reaction of phenol with reactive sites occurred in supercritical water and suppressed cross-linking reactions among reactive sites of large fragments. This promoted the decomposition of lignin to lower-molecular-weight compounds.

Original languageEnglish
Pages (from-to)922-928
Number of pages7
JournalEnergy and Fuels
Volume17
Issue number4
DOIs
Publication statusPublished - 2003 Jul 1

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology

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