NDLI: Recovery and esterification of aqueous carboxylates by using CO<sub>2</sub>-expanded alcohols with anion exchange

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Recovery and esterification of aqueous carboxylates by using CO₂-expanded alcohols with anion exchange

Content Provider	Royal Society of Chemistry (RSC)
Author	Wielen, Luuk A. M. van Cabrera-Rodríguez, Carlos I. Smet, Louis C. P. M. de Straathof, Adrie J. J. Paltrinieri, Laura
Copyright Year	2017
Abstract	The recovery of carboxylic acids from fermentation broth is one of the main bottlenecks for the industrial production of bio-based esters. This paper proposes an alternative for the recovery of carboxylates produced by fermentations at pH values above the pKa of the carboxylic acid. In this approach, the aqueous carboxylate anion is recovered using anion exchange, followed by desorption and esterification with CO2-expanded alcohols. Using CO2-expanded methanol, we achieved a high desorption yield at 10 bar of CO2 and 20 °C. An ester yield of 1.03 ± 0.07 mol methyl acetate/acetatein was obtained for the combined desorption–esterification at 5 bar of CO2 and 60 °C. The proposed process has low chemical consumption and low waste production. The proposed process works, with a lower yield, for other carboxylates (e.g. lactate and succinate) and alcohols (e.g. ethanol).
Starting Page	729
Ending Page	738
Page Count	10
File Format	HTM / HTML PDF
ISSN	14639262
Volume Number	19
Issue Number	3
Journal	Green Chemistry
DOI	10.1039/c6gc01391k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Fermentation Acid Acid dissociation constant Ion Ester Methanol Methyl acetate Lactic acid Succinic acid Ethanol
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution

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Recovery and esterification of aqueous carboxylates by using CO2-expanded alcohols with anion exchange

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