Molecular Solution Behaviour of an Intermediate Biofuel Feedstock: Acetone-Butanol-Ethanol (ABE)

Florian M. Zehentbauer, Johannes Kiefer*

*Corresponding author for this work

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Mixtures of acetone, butanol, and ethanol (ABE) are common intermediate products in the production of biofuels via biomass fermentation. Their separation to yield, for example, bio-butanol, is still difficult due to the lack of a fundamental understanding of these mixtures at the molecular level. In order to bridge this gap, a detailed analysis of characteristic features of the vibrational spectrum is carried out. A systematic study of the binary solutions of acetone with ethanol and butanol does not only reveal a universal behaviour at the molecular level when acetone is mixed with short-chain alcohols, it also shows that the phenomena at a length scale between the molecules and in the macroscopic solution need to be taken into account to understand the structure-property relationships. The size of self-associated molecule clusters seems to determine whether or not a system exhibits an azeotrope. When a second alcohol is added to an acetone/alcohol solution, no additional non-idealities are induced, which is advantageous for modelling ternary ABE mixtures and for improving their processing in the production of biofuels.

Original languageEnglish
Pages (from-to)3846-3858
Number of pages13
JournalChemPhysChem
Volume16
Issue number18
Early online date21 Oct 2015
DOIs
Publication statusPublished - 21 Dec 2015

Keywords

  • azeotropes
  • binary solutions
  • excess spectroscopy
  • infrared spectroscopy
  • molecular interactions
  • EXCESS MOLAR ENTHALPIES
  • VAPOR-LIQUID-EQUILIBRIA
  • PLUS BENZENE MIXTURES
  • 298.15 K
  • BINARY-MIXTURES
  • REFRACTIVE-INDEXES
  • DIPOLAR LIQUIDS
  • HYDROGEN-BOND
  • FREE-ENERGY
  • CONCENTRATION-DEPENDENCE

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