Highly selective recovery of medium chain carboxylates from co-fermented organic wastes using anion exchange with carbon dioxide expanded methanol desorption

Clara Fernando-Foncillas, Carlos I. Cabrera-Rodríguez, Francisco Caparrós-Salvador, Cristiano Varrone, Adrie J.J. Straathof

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

The aim of this work was to recover a mixture of carboxylates ranging from 2 to 7 carbon atoms using a strong anion exchange resin, followed by desorption with CO2-expanded methanol. Medium chain carboxylates hexanoate and heptanoate adsorbed better than acetate, and the corresponding medium chain carboxylic acids desorbed easier than acetic acid. Consequently, hexanoate and heptanoate were concentrated up to 14.6 and 20.7 times, respectively. These findings will enable effective separation and purification of the produced carboxylic acids. Notably, the presence of inorganic ions in the sample, such as chloride, decreased the adsorption affinity compared to a synthetic mixture only of carboxylates.

Original languageEnglish
Article number124178
JournalBioresource Technology
Volume319
DOIs
Publication statusPublished - 2021

Keywords

  • Anion exchange chromatography
  • Co-fermentation of organic wastes
  • CO-expanded methanol
  • Hexanoic acid
  • Medium chain carboxylic acids

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