Alkaline Partial Wet Oxidation of Lignin for the Production of Carboxylic Acids

Abayneh G. Demesa, Arto Laari, Ilkka Turunen, Mika Sillanpää

Research output: Contribution to journalArticlepeer-review

62 Citations (Scopus)

Abstract

The production of carboxylic acids by partial wet oxidation of alkali lignin was studied experimentally. The factors influencing the different types of products, their yields and concentrations were investigated. Formic, acetic, succinic, oxalic, and glutaconic acid were the main identified products. Both the temperature and oxygen partial pressure are shown to have direct effects on the product yields whereas the lignin concentration has an indirect effect. At low lignin concentrations, the yield of products was relatively high. However, at higher concentrations, the yield decreased. By measuring the lignin molecular weight distributions, it is shown that this decrease is linked to repolymerization/condensation reactions of lignin fragments which compete with oxidative lignin depolymerization.

Original languageEnglish
Pages (from-to)2270-2278
Number of pages9
JournalChemical Engineering and Technology
Volume38
Issue number12
DOIs
Publication statusPublished - 1 Dec 2015
Externally publishedYes

Keywords

  • Carboxylic acids
  • Lignin valorization
  • Partial oxidation
  • Wet oxidation

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

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