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Enzymatic Synthesis of Ethyl Palmitate in Supercritical Carbon Dioxide

Kumar, Rajnish and Madras, Giridhar and Modak, Jayant (2004) Enzymatic Synthesis of Ethyl Palmitate in Supercritical Carbon Dioxide. In: Industrial & Engineering Chemistry Research, 43 (7). pp. 1568-1573.

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The esterification of palmitic acid with ethanol was investigated at various temperatures (35- 70 °C) in the presence of three lipases (Novozym 435, Lipolase 100T, and hog pancreas lipase) in supercritical carbon dioxide $(SCCO_2)$ and under solvent-free conditions. All enzymes showed an optimum temperature of 55 °C under both conditions. The effect of water and ethanol addition on the esterification of acid was also investigated. The conversion obtained in $SCCO_2$ and under solvent-free conditions with Novozym at optimal conditions was 74 and 97%, respectively. Although a higher apparent yield was obtained under the solvent-free conditions due to higher substrate and enzyme concentrations, the reaction in supercritical carbon dioxide is better because of lower enzyme loading, higher reaction rates and easier downstream processing.

Item Type: Journal Article
Publication: Industrial & Engineering Chemistry Research
Publisher: American Chemical Society
Additional Information: The copyright belongs to American Chemical Society.
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 27 May 2006
Last Modified: 19 Sep 2010 04:27
URI: http://eprints.iisc.ac.in/id/eprint/6958

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