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Biocatalytic transesterification of sunflower and waste cooking oils in ionic liquid media

Paper ID Volume ID Publish Year Pages File Format Full-Text
34909 45059 2011 6 PDF Available
Title
Biocatalytic transesterification of sunflower and waste cooking oils in ionic liquid media
Abstract

In the present study, 10 different ionic liquids based on 1-alkyl-3-methylimidazolium and 1-alkyl-3-methyl pyridinium cations combined with hexafluorophosphate, bis{(trifluoromethyl)sulfonyl}imide, tetrafluoroborate and trifluoromethanesulfonate were tested as reaction media for the transesterification of sunflower or waste cooking oils and 1-methanol catalyzed by an immobilized Candida antarctica lipase B (Novozyme 435). The reaction was also carried out in isopropanol and methyl tert-butyl ether as reference solvents. The ionic liquids 3-octyl-1-methylimidazolium hexafluorophosphate and 3-octyl-1-methylimidazolium bis{(trifluoromethyl)sulfonyl}imide permitted higher fatty acid methyl esters conversions than obtained with reference solvents. When the effect of cation and anion composition of the ionic liquid on the synthetic activity of C. antarctica lipase B (CaLB) was analysed, the activity was enhanced by increasing cation hydrophobicity and decreasing anion nucleophilicity. The optimal water content and methanol to oil substrate molar ratio were also determined, using the ionic liquid 3-octyl-1-methylimidazolium hexafluorophosphate as reaction media, and were found to be 1% and 12:1, respectively. The transesterification reaction was also carried out using waste cooking oils as feedstock and fatty acid methyl esters production was similar to that obtained with sunflower oil.

Keywords
Biodiesel; Ionic liquids; Fatty acid methyl esters; Transesterification; Lipase
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Biocatalytic transesterification of sunflower and waste cooking oils in ionic liquid media
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 46, Issue 7, July 2011, Pages 1475–1480
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us