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Recovery and esterification of aqueous carboxylates by using CO2-expanded alcohols with anion exchange.
- Source :
- Green Chemistry; 2/7/2017, Vol. 19 Issue 3, p729-738, 10p
- Publication 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 pK<subscript>a</subscript> of the carboxylic acid. In this approach, the aqueous carboxylate anion is recovered using anion exchange, followed by desorption and esterification with CO<subscript>2</subscript>-expanded alcohols. Using CO<subscript>2</subscript>-expanded methanol, we achieved a high desorption yield at 10 bar of CO<subscript>2</subscript> and 20 °C. An ester yield of 1.03 ± 0.07 mol methyl acetate/acetate<subscript>in</subscript> was obtained for the combined desorption–esterification at 5 bar of CO<subscript>2</subscript> 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). [ABSTRACT FROM AUTHOR]
- Subjects :
- ESTERIFICATION
AQUEOUS electrolytes
ION exchange resins
Subjects
Details
- Language :
- English
- ISSN :
- 14639262
- Volume :
- 19
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Green Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 121151317
- Full Text :
- https://doi.org/10.1039/c6gc01391k