Effect of metal formates on hydrothermolysis of organosolv lignin for the production of bio-oil

Syed Farhan Hashmi*, Leena Pitkänen, Anne Usvalampi, Heidi Meriö-Talvio, Kyösti Ruuttunen, Herbert Sixta

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

This research work investigated the use of various metal formates with emphasis on sodium formate for catalyzing depolymerization of organosolv lignin to bio-oils rich in monoaromatic phenolic compounds. The addition of sodium or calcium formate to the reaction mixture greatly influenced the bio-oil composition, whereas magnesium formate showed minor influence compared to non-catalytic reactions. The optimum yield of bio-oil was 13.9% of feed lignin achieved at 310 °C after 60 min of reaction time using sodium formate and contained 92 mg monoaromatics per gram of feed lignin. All the bio-oil samples demonstrated narrow molar mass distribution having an average molar mass of 207–277 g mol−1 containing syringol, guaiacol, catechol and methoxy catechol as major compounds.

Original languageEnglish
Article number117573
JournalFuel
Volume271
DOIs
Publication statusPublished - 1 Jul 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Bio-oil
  • Depolymerization
  • Hydrothermolysis
  • Lignin
  • Metal formates

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