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An eco-friendly synthesis of 1,2-methylenedioxybenzene in vapour phase

Paper ID Volume ID Publish Year Pages File Format Full-Text
47334 46468 2010 7 PDF Available
Title
An eco-friendly synthesis of 1,2-methylenedioxybenzene in vapour phase
Abstract

An environmentally friendly synthesis of 1,2-methylenedioxybenzene (MDB) was carried out, avoiding the use of any dihalomethane, reacting 1,2-dihydroxybenzene (DHB, also called catechol) with formaldehyde acetals in the vapour phase and in the presence of suitable heterogeneous catalysts. Ti-silicalite (TS-1) or some Ti-, Sn- or Zr-doped MCM-41 were extensively investigated for this role. Catalysts were characterised using different techniques, including BET surface area, X-ray diffraction, FT-IR spectroscopy and thermal gravimetric analysis. Some interesting results were obtained with either TS-1 or Sn-doped MCM-41, which shed light on the role of surface acidity, reaction temperature and residence time on the reactivity and catalyst deactivation. The subsequent regeneration of a spent catalyst was shown to be possible. Among the formaldehyde acetals investigated (dimethoxymethane, diethoxymethane, dipropoxymethane or 1,3-dioxolane), the results showed diethoxymethane to be the most suitable reagent, giving rise to selectivity values higher than 80% in MDB. Finally, a possible reaction pathway was proposed by indicating the role of 2-(ethoxymethoxy)phenol as a reaction intermediate and explaining the origin of observed by-products.

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Keywords
Vapour phase; 1,2-Methylenedioxybenzene; Ti-silicalite; MCM-41 catalysts; Formaldehyde acetals; 1,2-Dihydroxybenzene; Reaction pathway
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An eco-friendly synthesis of 1,2-methylenedioxybenzene in vapour phase
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 98, Issues 1–2, 20 July 2010, Pages 72–78
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