Wet partial oxidation of guaiacol into carboxylic acids using hydrogen peroxide

Md. Hujjatul Islam, V.M. Kaprielian, A. Bakó, M.E. Tertsch, Rudi Pankratz Nielsen, Marco Maschietti

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearch

Abstract

The Wet Partial Oxidation (WPO) of guaiacol, a primary product of hydrothermal decomposition of lignin, was carried out using an injection batch reactor (99 mL). Hydrogen peroxide was used as oxidant and the process was investigated at different temperatures (150 to 300 °C) and reaction times (1 to 25 min), for given oxygen supply (40 %) and pressure (100 bar). At the tested conditions, six C2-C5 dicarboxylic acids (DCA: oxalic, malonic, maleic, succinic, fumaric, and glutaric acid) and three short-chain monocarboxylic acids (MCA: formic, acetic, and lactic acid) were identified and quantitated. Dihydroxybenzenes, aromatic aldehydes, and aromatics acids were also identified at lower temperatures and reaction times, whereas they disappeared at higher reaction severity. The total carbon-based yield of MCA + DCA was in the range of 4 % to 19 %, showing higher values at intermediate reaction severity. Overall, these preliminary results show that MCA and DCA are intermediate products of complex reaction schemes, involving formation of 1-ring oxygenated aromatics, ring-opening reactions to DCA, and decomposition to short-chain MCA. The results suggest that the WPO of lignin can be a source of MCA and DCA in good yields, but fine tuning of reaction conditions (temperature, time, oxygen supply) is necessary.

Original languageEnglish
Title of host publicationProceedings of the 26th European Biomass Conference and Exhibition
Number of pages6
Volume2018
Publication date2018
Edition26thEUBCE
Pages1163-1168
ISBN (Print)978-88-89407-18-9
DOIs
Publication statusPublished - 2018
Event26th European Biomass Conference and Exhibition - Copenhagen, Denmark
Duration: 14 May 201818 May 2018

Conference

Conference26th European Biomass Conference and Exhibition
CountryDenmark
CityCopenhagen
Period14/05/201818/05/2018
SeriesEuropean Biomass Conference and Exhibition Proceedings
ISSN2282-5819

Keywords

  • Dicarboxylic acids
  • Guaiacol
  • Lignin
  • Organic acids
  • Thermochemical conversion
  • Wet partial oxidation

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