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Solvent free selective oxidation of benzyl alcohol to benzaldehyde using a membrane contactor unit

Paper ID Volume ID Publish Year Pages File Format Full-Text
48419 46506 2008 8 PDF Available
Title
Solvent free selective oxidation of benzyl alcohol to benzaldehyde using a membrane contactor unit
Abstract

A new clean catalytic process for the selective oxidation of benzyl alcohol with hydrogen peroxide to benzaldehyde has been studied. Neither solvent nor promoters are needed: a polymeric microporous membrane acts as a barrier to “keep in contact” the two phases: the organic phase, containing the substrate and the product, and the aqueous phase with the oxidant. Being the two phases separated by the membrane, there is no mix of them and dispersion phenomena do not occur. The species are transferred from one phase to the other only by diffusion.The effect of various reaction parameters such as reaction temperature, type of membrane, type of catalyst, the addition mode of hydrogen peroxide was investigated.Three different membranes based on hydrophobic polyvinilidene fluoride (PVDF) were prepared by phase inversion technique induced by nonsolvent and used as membrane contactor. The membranes are characterized by different thicknesses, porosity, tortuosity and hydrophobicity. The catalysts used were ammonium molybdate, (NH4)6Mo7O24 and sodium tungstate, Na2WO4. In literature, both these catalysts were reported to be effective in the oxidation of alcohols with H2O2 in combination with a phase transfer catalyst in chlorinated solvents.

Keywords
Selective oxidation; Solvent free reaction; Hydrogen peroxide; Membrane contactor; Sustainable process
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Solvent free selective oxidation of benzyl alcohol to benzaldehyde using a membrane contactor unit
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 79, Issue 1, 21 February 2008, Pages 35–42
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