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A new recirculating enzymatic membrane reactor for ester synthesis in ionic liquid/supercritical carbon dioxide biphasic systems

Paper ID Volume ID Publish Year Pages File Format Full-Text
48943 46531 2006 6 PDF Available
Title
A new recirculating enzymatic membrane reactor for ester synthesis in ionic liquid/supercritical carbon dioxide biphasic systems
Abstract

Dynamic membranes with immobilized Candida antarctica lipase B (CALB) were successfully applied for butyl propionate synthesis in a recirculating bioreactor in supercritical carbon dioxide medium and in room temperature ionic liquid/supercritical carbon dioxide biphasic systems at 50 °C and 80 bar.In room temperature ionic liquid/supercritical carbon dioxide biphasic systems, the immobilized enzyme coated with three different ionic liquids based on dialkylimidazolium cations, showed an increase in the selectivity of the process (up to 99.5%) compared with supercritical carbon dioxide assayed in the absence of room temperature ionic liquid. For the RTILs assayed, it was observed that the increase in activity was in agreement with an increase in the partition coefficients of the substrates between RTIL and hexane.Additionally, a model based on the Ping Pong Bi–Bi mechanism with competitive alcohol inhibition is proposed to describe the kinetics of the transesterification reaction in supercritical carbon dioxide.

Keywords
Ionic liquids; Supercritical fluids; Lipase; Membrane reactor
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A new recirculating enzymatic membrane reactor for ester synthesis in ionic liquid/supercritical carbon dioxide biphasic systems
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 67, Issues 1–2, 11 September 2006, Pages 121–126
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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