Extraction and Esterification of Low-Titer Short-Chain Volatile Fatty Acids from Anaerobic Fermentation with Ionic Liquids

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• 作者：Stephen J. Andersen ; Jan K. E. T. Berton ; Pieter Naert ; Sylvia Gildemyn ; Prof. Korneel Rabaey and Prof. Christian V. Stevens
• 刊名：ChemSusChem
• 出版年：2016
• 出版时间：August 23, 2016
• 年：2016
• 卷：9
• 期：16
• 页码：2059-2063
• 全文大小：570K
• ISSN：1864-564X

文摘

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 30 min at 75 °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.