Journal
CHEMSUSCHEM
Volume 9, Issue 16, Pages 2059-2063Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201600473
Keywords
biorefinery; esterification; ionic liquids; sustainable chemistry; volatile fatty acids
Funding
- Ghent University Multidisciplinary Research Partnership (MRP)-Biotechnology for a sustainable economy [01 MRA 510 W]
- Research Foundation Flanders (FWO)
- Special Research Fund (BOF) from Ghent University
- European Research Council Starter Grant ELECTROTALK
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Ionic liquids can both act as a solvent and mediate esterification to valorize low-titer volatile fatty acids and generate organic solvents from renewable carbon sources including biowaste and CO2. In this study, four phosphonium ionic liquids were tested for single-stage extraction of acetic acid from a dilute stream and esterification to ethyl acetate with added ethanol and heat. The esterification proceeded with a maximum conversion of 85.9 +/- 1.3% after 30min at 75 degrees C at a 1:1 stoichiometric ratio of reactants. Extraction and esterification can be tailored using mixed-anion ionic liquids; this is demonstrated herein using a common trihexyl(tetradecyl)phosphonium cation and a mixed chloride and bis(trifluoromethylsulfonyl)imide anion ionic liquid. As a further proof-of-concept, ethyl acetate was generated from an ionic liquid-driven esterification of an acetic acid extractant generated using CO2 as the only carbon source by microbial electrosynthesis.
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