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Effect of solvent on hydrolysis and transesterification reactions on tungstated zirconia

Paper ID Volume ID Publish Year Pages File Format Full-Text
41858 45902 2010 6 PDF Available
Title
Effect of solvent on hydrolysis and transesterification reactions on tungstated zirconia
Abstract

Using solvents has been found not only to overcome the miscibility problem in biodiesel synthesis but also makes it possible to obtain precise kinetic data. However, little is known about the effect of these solvents themselves on the reaction kinetics. This study explored solvent effects on the nature of the catalytic activity of the solid acid tungstated zirconia (WZ) for hydrolysis and transesterification of tricaprylin (TCp), two reactions that can occur during biodiesel synthesis, at 130 °C and 12.2 atm in a batch reactor using different solvents. It was found that hexane and a mixture of lauric acid (HLa) and hexane resulted in the highest catalytic activities for transesterification and hydrolysis, respectively, probably due to their non-polar and low kinematic viscosity inducing characteristics. Tetrahydrofuran (THF), in contrast, having a higher polarity, tended to reduce the activity for both hydrolysis and transesterification by competing for active sites on the WZ surface and being involved in side reactions with methanol.

Graphical abstractThis study found that hexane and a mixture of lauric acid (HLa) and hexane resulted in the highest catalytic activities on tungstated zirconia (WZ) for transesterification and hydrolysis, respectively, probably due to their non-polar and low kinematic viscosity inducing characteristics.The figure represents the effect of the use of solvents (33% of reaction mixture) on the catalytic activity of WZ for transesterification of TCp at 130 °C.Figure optionsDownload full-size imageDownload high-quality image (86 K)Download as PowerPoint slide

Keywords
Solvent effect; Triglycerides; Tricaprylin; Hydrolysis; Transesterification; Tungstated zirconia; WZ; Biodiesel synthesis
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Effect of solvent on hydrolysis and transesterification reactions on tungstated zirconia
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 380, Issues 1–2, 31 May 2010, Pages 81–86
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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