BioChem - DOS

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

ChemSusChem

Andersen, Stephen J.; Berton, Jan K. E. T.; Naert, Pieter; Gildemyn, Sylvia; Rabaey, Korneel; Stevens, Christian V.

<P><B>Abstract</B></P><P>Ionic liquids can both act as a solvent and mediate esterification to valorize low&#8208;titer volatile fatty acids and generate organic solvents from renewable carbon sources including biowaste and CO<SUB>2</SUB>. In this study, four phosphonium ionic liquids were tested for single&#8208;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&plusmn;1.3 % after 30 min at 75 &deg;C at a 1:1 stoichiometric ratio of reactants. Extraction and esterification can be tailored using mixed&#8208;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&#8208;of&#8208;concept, ethyl acetate was generated from an ionic liquid&#8208;driven esterification of an acetic acid extractant generated using CO<SUB>2</SUB> as the only carbon source by microbial electrosynthesis.</P>

2016

1864-5631

1864-564x

9

16

pp.2059-2063

10.1002/cssc.201600473

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART76798737

biorefinery; esterification; ionic liquids; sustainable chemistry; volatile fatty acids