Electrosynthesis of 2,3-butanediol and methyl ethyl ketone from acetoin in flow cells

José R. Ochoa-Gómez, Francisco Fernández-Carretero, Francisca Río-Pérez, Alberto García-Luis, Tomás Roncal, Eduardo J. García-Suárez

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Acetoin could shortly become a platform molecule due to current progress in fermentation technology, the megatrend for shifting from an oil-based economy to one based on biomass, the quest for green manufacturing processes and its two highly reactive carbonyl and hydroxyl moieties. In this paper, the successful electro-conversion of acetoin into two valuable chemicals, 2,3-butandiol (2,3-BD) and methyl ethyl ketone (MEK), at constant electrical current in aqueous phase at room temperature using both divided and undivided 20 cm2 filter-press flow cells under experimental conditions suitable for industrial production is reported. Cathode material is the key parameter to drive the electroreduction towards one or another chemical. 2,3-BD is the major chemical produced by electrohydrogenation when low hydrogen overvoltage cathodes, such as Pt and Ni, of high surface area obtained by PVD coating on a carbon gas diffusion layer are used, while MEK is the principal product produced by electrohydrogenolysis when high hydrogen overvoltage cathodes, such as graphite, Pb and Cd foils, are employed. 2,3-BD and MEK can be obtained, respectively, in 92.8% and 85.7% selectivities, 71.7% and 80.4% current efficiencies, with 1.21 and 1.08 kg.h-1.m-2 productivities and power consumptions of 2.94 and 4.1 kWh.kg-1 using undivided cells and aqueous K2HPO4 electrolysis media at pHs of 3.6 and 5.5. The reported electroconversion of acetoin is highly flexible because 2,3-BD and MEK can be produced by changing just the cathode but using the same cell, with the same electrolyte at the same current density.
Original languageEnglish
Pages (from-to)164-177
Number of pages14
JournalGreen Chemistry
Volumeunknown
Issue number1
DOIs
Publication statusPublished - 2019

Keywords

  • Green manufacturing processes
  • Acetoin
  • Biomass
  • Green chemistry

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